Hatem Alkadhi
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Radiologist, Professor – Expert in CT, radiation dose, perfusion, dual-energy, iterative reconstruction

Curriculum vitae

All posts of Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Gouty arthritis: the diagnostic and therapeutic impact of dual-energy CT

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 25, 2017
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Objectives: To determine the diagnostic and therapeutic impact of dual-energy computed tomography (DECT) in gout. Read more

Computer-aided detection (CAD) of solid pulmonary nodules in chest x-ray equivalent ultralow dose chest CT – first in-vivo results at doselevels of 0.13 mSv

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 10, 2017
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Objectives: To determine the value of computer-aided detection (CAD) for solid pulmonary nodules in ultralow radiation dose single-energy computed tomography (CT) of the chest using third-generation dual-source CT at 100kV and fixed tube current at 70 mAs with tin filtration. Read more

Organ Dose and Attributable Cancer Risk in Lung Cancer Screening with Low-Dose CT.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 22, 2017
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Purpose: Lung cancer screening with CT has been recently recommended for decreasing lung cancer mortality. The radiation dose of CT, however, must be kept as low as reasonably achievable for reducing potential stochastic risks from ionizing radiation. The purpose of this study was to calculate individual patients’ lung doses and … Read more

Prospective Randomized Comparison of High-pitch CT at 80 kVp Under Free Breathing with Standard-pitch CT at 100 kVp Under Breath-Hold for Detection of Pulmonary Embolism.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 7, 2017
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Rationale and Objectives: To prospectively compare high-pitch computed tomography (HPCT) under free breathing (FB) with standard-pitch CT (SPCT) under breath-hold (BH) for detection of pulmonary embolism (PE). Read more

Correlation between Dual-Energy and Perfusion CT in Patients with Hepatocellular Carcinoma.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Feb 6, 2017
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Purpose: To develop a dual-energy contrast media-enhanced computed tomographic (CT) protocol by using time-attenuation curves from previously acquired perfusion CT data and to evaluate prospectively the relationship between iodine enhancement metrics at dual-energy CT and perfusion CT parameters in patients with hepatocellular carcinoma (HCC). Read more

Noise Texture Deviation: A Measure for Quantifying Artifacts in CT Images With Iterative Reconstructions.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 22, 2017
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Objectives: The aims of this study were to introduce the measure noise texture deviation as quantitative parameter for evaluating iterative reconstruction (IR)-specific artifacts in computed tomography (CT) images and to test whether IR-specific artifacts, quantified through this measure, are reduced in advanced modeled IR (ADMIRE) as compared with sinogram-affirmed IR … Read more

Effect of Localizer Radiography Projection on Organ Dose at Chest CT with Automatic Tube Current Modulation.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 12, 2017
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Purpose: To calculate the effect of localizer radiography projections to the total radiation dose, including both the dose from localizer radiography and that from subsequent chest computed tomography (CT) with tube current modulation (TCM). Read more

Cinematic rendering – an alternative to volume rendering for 3D CT imaging

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Dec 27, 2016
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The objective of this review is to illustrate the image appearance and potential value of CR in comparison with conventional VR in a number of various applications and different anatomical regions. Read more

CT Angiography of the Aorta: Prospective Evaluation of Individualized Low-Volume Contrast Media Protocols.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Oct 18, 2016
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Purpose: To prospectively develop individualized low-volume contrast media (CM) protocols adapted to tube voltage in patients undergoing computed tomographic (CT) angiography of the aorta. Read more

Evaluation of pulmonary nodules and infection on chest CT with radiation dose equivalent to chest radiography: Prospective intra-individual comparison study to standard dose CT

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Sep 27, 2016
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Purpose: To compare prospectively, in patients undergoing chest computed tomography (CT) for pulmonary-nodules or infection, imagequality and accuracy of standard dose (SD) and reduced dose (RD) CT with tin-filtration. Read more

Metal Artifact Reduction in Pelvic Computed Tomography With Hip Prostheses: Comparison of Virtual Monoenergetic Extrapolations From Dual-Energy Computed Tomography and an Iterative Metal Artifact Reduction Algorithm in a Phantom Study.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 18, 2016
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The aim of this study was to directly compare metal artifact reduction (MAR) of virtual monoenergetic extrapolations (VMEs) from dual-energy computed tomography (CT) with iterative MAR (iMAR) from single energy in pelvic CT with hip prostheses. Read more

Advanced virtual monoenergetic images: improving the contrast of dual-energy CT pulmonary angiography.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 16, 2016
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Purpose: To investigate the value of advanced virtual monoenergetic image reconstruction (mono-plus) from dual-energy computed tomography (CT) for improving the contrast of CT pulmonary angiography (CTPA). Read more

Ultralow-Dose CT with Tin-Filtration for Detection of Solid and Sub-solid Pulmonary Nodules: A phantom study

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Feb 18, 2016
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Purpose: To investigate diagnostic performance of advanced modelled iterative reconstruction (ADMIRE) to filtered back projection (FBP) when using an ultra-low dose protocol for the detection of solid and sub-solid pulmonary-nodules. Read more

Predictive value of low tube voltage and dual-energy CT for successful shock wave lithotripsy: an in vitro study

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 8, 2016
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

This study investigates the capabilities of low tube voltage computed tomography (CT) and dual-energy CT (DECT) for predicting successful shock wave lithotripsy (SWL) of urinary stones in vitro. Read more

Advanced modelled iterative reconstruction for abdominal CT: Qualitative and quantitative evaluation

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 13, 2015
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To determine qualitative and quantitative image-quality parameters in abdominal imaging using advanced modelled iterative reconstruction (ADMIRE) with third-generation dual-source 192 section CT. Read more

Cardiac CT and echocardiographic evaluation of peri-device flow after percutaneous left atrial appendage closure using the AMPLATZER cardiac plug device

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 16, 2015
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The present study evaluates for the first time peri-device flow after LAA closure by AMPLATZER-Cardiac-Plug (ACP) using a combined cardiac-CT and TEE follow-up. Read more

High-pitch coronary CT angiography with third generation dual-source CT: limits of heart rate

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jul 28, 2014
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Third-generation dual-source 192-slice CT allows for coronary angiography in the prospectively ECG-gated high-pitch mode with diagnostic image quality at HR up to 70 bpm. HRV is not significantly related to image quality of coronary CTA. Read more

Performance of turbo high-pitch dual-source CT for coronary CT angiography: first ex vivo and patient experience

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jul 23, 2014
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To evaluate image quality, maximal heart rate allowing for diagnostic imaging, and radiation dose of turbo high-pitch dual-source CCTA. Read more

Feasibility of single-source dual-energy CT for urinary stone characterization and value of iterative reconstructions

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jun 24, 2014
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The purposes of this study were to demonstrate the feasibility and accuracy of single-source dual-energy (DE) CT with sequential data acquisition and a coregistration motion correction algorithm for urinary stone characterization and to evaluate the value of iterative reconstructions in DE imaging. Read more

Added Value of Dual-Energy CT Versus Single-Energy CT in Assessing Ferromagnetic Properties of Ballistic Projectiles: Implications for MRI of Gunshot Victims

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jun 10, 2014
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

We sought to determine whether a “safe zone” for TSP could be visualised by CT, especially if larger device sizes for interatrial septal communication closure (IASC-C) had been used. Read more

CT metal artefact reduction for internal fixation of the proximal humerus: Value of mono-energetic extrapolation from dual-energy and iterative reconstructions

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | May 12, 2014
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Both IFS-MAR in SECT and mono-energetic DECT produce improved image quality and a reduction of metal artefacts. Screw tip positions can be most confidently assessed using DECT. Read more

Iterative reconstructions versus filtered back-projection for urinary stone detection in low-dose CT

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 28, 2014
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

IR improves image quality and confidence for diagnosing urinary stone disease in abdominal low-dose CT. Read more

Effect of high-pitch dual-source CT to compensate motion artifacts: a phantom study

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 19, 2014
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

High-pitch DSCT significantly decreases motion artifacts in various directions and improves image quality. Read more

Coronary artery stent imaging with CT using an integrated electronics detector and iterative reconstructions: first in vitro experience

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 3, 2014
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

CT coronary stent imaging is significantly improved by using a detector with integrated electronics combined with iterative reconstructions. Read more

Combining automated attenuation-based tube voltage selection and iterative reconstruction: a liver phantom study

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Feb 15, 2014
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To determine the value of combined automated attenuation-based tube-potential selection and iterative reconstructions (IRs) for optimising computed tomography (CT) imaging of hypodense liver lesions. Read more

Sizing the mitral annulus in healthy subjects and patients with mitral regurgitation: 2D versus 3D measurements from cardiac CT

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 30, 2014
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Our study provides in vivo human CT data on MA dimensions in normals and patients with FMR, indicating differences in patients for the area, posterior circumference and SLD but not for the anterior circumference and CC. Read more

Metal artefact reduction from dental hardware in carotid CT angiography using iterative reconstructions

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Dec 18, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To determine the value of a metal artefact reduction (MAR) algorithm with iterative reconstructions for dental hardware in carotid CT angiography. Read more

Reduction of Metal Artifacts from Hip Prostheses on CT Images of the Pelvis: Value of Iterative Reconstructions

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 26, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The IFS algorithm for CT image reconstruction significantly reduces metal artifacts from hip prostheses, improves the reliability of CT number measurements, and improves the confidence for depicting pelvic abnormalities. Read more

CT Perfusion Imaging for the Prediction of Response and Survival to Transarterial Radioembolization of Liver Metastases

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 22, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The purpose of this study was to evaluate prospectively, in patients with liver metastases, the ability of CT perfusion to predict the morphologic response and survival after transarterial radioembolization (TARE). Read more

Monoenergetic CT reconstructions reduce beam hardening artifacts from dental restorations

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Oct 2, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The aim of this study was to assess the potential of monoenergetic CT images to reduce beam hardening artifacts in comparison to standard CT images of dental restoration on dental post-mortem CT. Read more

Split-bolus dual-energy CT urography: protocol optimization and diagnostic performance for the detection of urinary stones

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Sep 17, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Split-bolus DECT urography was technically feasible and quality of virtual non-enhanced images (VNEI) was improved with the 100/140 kVp setting. Detection of urinary stones Read more

Effect of automatic tube voltage selection on image quality and radiation dose in abdominal CT angiography of various body sizes: a phantom study

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Aug 30, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To assess the effect of an automatic tube voltage selection technique on image quality and radiation dose in abdominal CT angiography of various body sizes. Read more

CT perfusion imaging of renal cell carcinoma: systematic comparison with histopathological angiogenic and prognostic markers

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jul 9, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The aim of this study was to systematically analyze the correlation between CT perfusion and histopathological angiogenic and prognostic markers in patients with renal cell carcinoma (RCC). Read more

Uncommon Cause of Ventricular Tachycardia in a Patient with a Giant Pseudoaneurysm of the Ascending Aorta

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jun 27, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

We present an uncommon cause of ventricular tachycardia due to excessive right coronary artery stretch in a patient with a giant pseudoaneurysm of the ascending aorta years after aortic root repair. Read more

Automated attenuation-based kilovoltage selection: preliminary observations in patients after endovascular aneurysm repair of the abdominal aorta

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | May 27, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The objective of our study was to assess prospectively the impact of automated attenuation-based kilovoltage selection on image quality and radiation dose in patients undergoing body CTA after endovascular aneurysm repair (EVAR) of the abdominal aorta. Read more

Low Kilovoltage CT of the Neck with 70 kVp: Comparison with a Standard Protocol

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 15, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The purpose of our study was to assess the image quality and radiation dose of neck CT at a tube potential of 70 kVp. Read more

Choosing the optimal wall shear parameter for the prediction of plaque location-A patient-specific computational study in human left coronary arteries

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 25, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Here we determine the performance of said wall shear parameters in the LCA for the prediction of plaque development locations and compare these results to those previously found in the RCA. Read more

MRI and CT in the diagnosis of coronary artery disease: indications and applications

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 11, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

In this review, the major aspects of non-invasive MR and CT imaging in the diagnosis of CAD will be discussed. Read more

Dual- and multi-energy CT: approach to functional imaging

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Feb 26, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

This article reviews the principles of dual- and multi-energy CT imaging, hardware approaches and clinical applications. Read more

Automated tube potential selection for standard chest and abdominal CT in follow-up patients with testicular cancer: comparison with fixed tube potential

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Feb 19, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To evaluate prospectively, in patients with testicular cancer, the radiation dose-saving potential and image quality of contrast-enhanced chest and abdominal CT with automated tube potential selection. Read more

Diagnostic Performance of Dual-Energy CT for the Detection of Traumatic Bone Marrow Lesions in the Ankle: Comparison with MR Imaging

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Feb 12, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To evaluate prospectively the performance of noncalcium images reconstructed from dual-energy (DE) CT for the diagnosis of bone marrow lesions in patients with acute ankle joint trauma in comparison with MR images. Read more

Liver perfusion imaging in patients with primary and metastatic liver malignancy: prospective comparison between 99mTc-MAA spect and dynamic CT perfusion

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 17, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To prospectively analyze the correlation between parameters of liver perfusion from technetium99m-macroaggregates of albumin (99mTc-MAA) single photon emission CT (SPECT) with those obtained from dynamic CT perfusion in patients with primary or metastatic liver malignancy. Read more

Routine chest and abdominal high-pitch CT: an alternative low dose protocol with preserved image quality

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 7, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To investigate the radiation dose and image quality of the high-pitch DSCT for routine chest and abdominal scans. Read more

Dual-energy CT for characterization of the incidental adrenal mass: preliminary observations.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 2, 2013
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The purpose of our study was to evaluate the accuracy of virtual unenhanced images reconstructed from contrast-enhanced dual-energy CT for the differentiation of incidental adrenal masses in comparison with standard unenhanced CT. Read more

Quantitative Perfusion Analysis of Malignant Liver Tumors: Dynamic CT and Contrast-Enhanced Ultrasound

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Dec 27, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To prospectively analyze the correlation between quantitative parameters of perfusion derived from dynamic contrast-enhanced CT (DCE-CT) and contrast-enhanced ultrasound (DCE-US) in patients with malignant liver tumors. Read more

Computed high concentrations of low-density lipoprotein correlate with plaque locations in human coronary arteries

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Dec 21, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

We report here on the correlation between healthy state subendothelial low-density lipoprotein (LDL) concentration distribution and sites of subsequent plaque formation in coronary arteries of patients with coronary artery disease. Read more

Technical principles of CT in patients with congenital heart disease

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Dec 11, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

With modern generations of CT systems and recent advances in temporal and spatial resolution, cardiac CT has been gaining an increasing reputation in the field of cardiac imaging and in the evaluation of patients with congenital heart disease. Read more

Image quality and radiation exposure with prospectively ECG-triggered axial scanning for coronary CT angiography: the multicenter, multivendor, randomized PROTECTION-III study.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 30, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The purpose of this study was to evaluate image quality and radiation dose using a prospectively ECG-triggered axial scan protocol compared with standard retrospective ECG-gated helical scanning for coronary CT angiography. Read more

Metallic artifact reduction with monoenergetic dual-energy CT: systematic ex vivo evaluation of posterior spinal fusion implants from various vendors and different spine levels

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 27, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To evaluate optimal monoenergetic dual-energy computed tomography (DECT) settings for artifact reduction of posterior spinal fusion implants of various vendors and spine levels. Read more

Low-dose CT of the lung: potential value of iterative reconstructions

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 5, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To prospectively assess the impact of sinogram-affirmed iterative reconstruction (SAFIRE) on image quality of nonenhanced low-dose lung CT as compared to filtered back projection (FBP). Read more

Can CT help predict feasibility of transseptal puncture after percutaneous closure of an interatrial septal communication?

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Oct 25, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

We sought to determine whether a “safe zone” for TSP could be visualised by CT, especially if larger device sizes for interatrial septal communication closure (IASC-C) had been used. Read more

Quantitative Perfusion Analysis of Malignant Liver Tumors: Dynamic CT and Contrast-Enhanced Ultrasound

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Oct 22, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To prospectively analyze the correlation between quantitative parameters of perfusion derived from dynamic contrast-enhanced CT (DCE-CT) and contrast-enhanced ultrasound (DCE-US) in patients with malignant liver tumors. Read more

CT of the lung in the high-pitch mode: is breath holding still required?

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Oct 11, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

CT of the lung can be accomplished using the HPM at a low radiation dose with a diagnostic image quality even without suspended respiration. Read more

Quantification of liver fat in the presence of iron and iodine: an ex-vivo dual-energy CT study

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Oct 5, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Our ex vivo phantom study indicates that DECT with the use of a dedicated, iron-specific 3-material decomposition algorithm allows for the accurate quantification of LFC, even in the presence of iron and iodinated CM. Read more

Intramural aortic abscess mimicking chronic aortic dissection

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Sep 18, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Preoperative imaging evaluations including transthoracic echocardiography and computed tomography were suggestive of a chronic ascending aortic dissection with an intramural hematoma. Read more

A systematic approach for analysis, interpretation, and reporting of coronary CTA studies

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Sep 7, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

This review describes a practical approach to the analysis and interpretation of coronary CTA data, including the standardized reporting of the relevant imaging findings to the referring physicians. Read more

3D fusion of functional cardiac magnetic resonance imaging and computed tomography coronary angiography: accuracy and added clinical value

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Aug 27, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

3D fusion of low-dose CTCA and functional CMR is feasible and accurate, and adds, at a low radiation dose, diagnostic value for the assessment of hemodynamically relevant CAD as compared with side-by-side analysis alone. Read more

Coronary artery plaques and myocardial ischaemia

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jul 30, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To prospectively examine coronary artery plaques as predictors of myocardial ischaemia using cardiac magnetic resonance (CMR). Read more

Quantification of liver iron content with CT-added value of dual-energy

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jun 26, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Virtual iron concentration images generated from DECT provide added value for the quantification of LIC by disregarding the confounding effect of the natural variation of healthy liver attenuation and of co-existing liver fat. Read more

Delayed enhancement imaging of myocardial viability: low-dose high-pitch CT versus MRI

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | May 29, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

CTDE imaging in the high-pitch mode enables myocardial viability assessment at a low radiation dose and good accuracy compared with MR, although associated with a lower CNR and higher noise. Read more

Automated attenuation-based tube potential selection for thoracoabdominal CTA: improved dose effectiveness

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | May 2, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Automated attenuation-based tube potential selection based on the attenuation profile of the topogram is feasible, provides a diagnostic image quality of body CTA, and reduces overall radiation dose by 25% as compared with a standard protocol with 120 kV. Read more

Raw data-based iterative reconstruction in body CTA: evaluation of radiation dose saving potential

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 17, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Intra-individual comparisons of image quality of body CTA suggest that raw data-based iterative reconstruction allows for dose reduction >50% while maintaining image quality. Read more

The potential value of hybrid PET/dual-source CT imaging in coronary bypass surgery

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 29, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

PET/CT fusion imaging could potentially influence planning for coronary artery bypass surgery (CABG) and provide incremental prognostic information. Read more

Adenosine stress high-pitch 128-slice dual-source myocardial CT perfusion for imaging of reversible myocardial ischemia: comparison with MRI

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 19, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Adenosine-induced stress 128-slice dual-source high-pitch myocardial CTP allows for simultaneously assessment of reversible myocardial ischemia and coronary stenosis, with good diagnostic accuracy as compared with CMR and invasive angiography, at a very low radiation exposure. Read more

CT Perfusion of Renal Cell Carcinoma: Impact of Volume Coverage on Quantitative Analysis

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 5, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

CT perfusion imaging using an adaptive 4D-spiral mode is feasible and enables, after use of automated motion correction, the reliable analysis of renal perfusion in patients with RCCs. Read more

Predictors of image quality in high-pitch coronary CT angiography

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Feb 27, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Heart rate frequency and motion artifacts on preceding high-pitch CAC represent significant independent predictors of image quality in high-pitch coronary CTA. Read more

Evaluation of cardiac morphology, function, and perfusion at low radiation dose before mitral valve surgery

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Feb 13, 2012
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

A low-dose cardiac CT examination for preoperative assessment of coronary artery disease and mitral valve annulus dimensions in 79-year-old female with mitral valve regurgitation. Read more

Quantitative CT liver perfusion imaging using dynamic spiral scanning with variable pitch: feasibility and initial results in patients with cancer metastases

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 18, 2011
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To assess the feasibility and image quality of CT liver perfusion imaging using an adaptive 4D spiral-mode, developed to extend the z-axis coverage, and to report initial qualitative and quantitative results in patients with cancer metastases. Read more

Low-dose, 128-slice, DSCT coronary angiography: accuracy and radiation dose of the high-pitch and the step-and-shoot mode

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Feb 23, 2011
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To compare the diagnostic accuracy and radiation doses of two low-dose protocols for coronary artery imaging with second-generation DSCT in comparison with catheter angiography. Read more

Coronary artery disease: Which degree of coronary artery stenosis is indicative of ischemia?

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 18, 2011
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To prospectively determine the best cut-off value of stenosis degree for low-dose CT coronary angiography to predict the hemodynamic significance of coronary artery stenoses compared to catheter angiography using a cardiac MR based approach as standard of reference. Read more

Prospective and retrospective ECG-gating for CT coronary angiography perform similarly accurate at low heart rates

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 22, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Prospectively ECG-gated CTCA yields similar image quality, performs as accurately as retrospectively ECG-gated CTCA in patients having heart rates Read more

Performance of dual-energy CT with tin filter technology for the discrimination of renal cysts and enhancing masses

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 8, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To assess the performance of dual-energy computed tomography (DECT) equipped with the new tin filter technology to classify phantom renal lesions as cysts or enhancing masses. Read more

Low Dose High-Pitch Spiral Acquisition 128-Slice Dual-Source Computed Tomography for the Evaluation of Coronary Artery Bypass Graft Patency

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Oct 26, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To prospectively assess electrocardiography (ECG)-synchronized dual-source computed tomography (DSCT) in high-pitch spiral acquisition mode for the evaluation of coronary artery bypass graft (CABG) patency regarding image quality and radiation dose. Read more

High-pitch DSCT angiography of the thoracic and abdominal aorta: is simultaneous coronary artery assessment possible?

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Sep 28, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The purpose of this study was to prospectively evaluate the average heart rate and heart rate variability required for diagnostic imaging of the coronary arteries with high-pitch DSCT angiography of the thoracic and thoracoabdominal aorta. Read more

Characterization of urinary stones with dual-energy CT: improved differentiation using a tin filter

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Sep 9, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To assess image quality and capability of stone differentiation between UA-containing and non-UA-containing uroliths with the latest dual-energy (DE) computed tomography (CT) system equipped with a tin filter (TF) using various data acquisition parameters in a work bench model. Read more

Diagnostic accuracy of high-pitch dual-source CT for the assessment of coronary stenoses: first experience

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Aug 13, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The objective was to prospectively investigate the diagnostic accuracy of high-pitch (HP) DSCT coronary angiography (CTCA) compared with catheter coronary angiography (CCA) for the diagnosis of significant coronary stenoses. Read more

Coronary artery stent imaging with 128-slice DSCT using high-pitch spiral acquisition in a cardiac phantom: comparison with the sequential and low-pitch spiral mode.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jul 8, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The HPS mode of 128-slice dual-source CT yields fewer artefacts inside the stent lumen compared with SPIR and SEQ, but image noise is higher. Read more

Left ventricular and left atrial dimensions and volumes: comparison between dual-source CT and echocardiography

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jun 23, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Our results indicate that DSCT provides reliable measurements of LV dimensions, volumes, and myocardial mass with similar values as compared with echocardiography. Read more

Remodelling of the aortic root in severe tricuspid aortic stenosis: implications for transcatheter aortic valve implantation

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | May 31, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Detailed knowledge of aortic root geometry is a prerequisite to anticipate complications of transcatheter aortic valve (TAV) implantation. We determined coronary ostial locations and aortic root dimensions in patients with aortic stenosis (AS) and compared these values with normal subjects using computed tomography (CT). Read more

Dual-step prospective ECG-triggered 128-slice dual-source CT for evaluation of coronary arteries and cardiac function without heart rate control: a technical note.

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | May 18, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

pECG(dual-step)128-slice DSCT is feasible for the evaluation of coronary arteries and cardiac function without heart rate control in patients in stable sinus rhythm at a low radiation dose. Read more

Case: Effective Dose Heart Scan

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 5, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.
  • Case: Effective Dose Heart Scan
  • Case: Effective Dose Heart Scan
  • Case: Effective Dose Heart Scan
  • Case: Effective Dose Heart Scan

Case history: 51-year-old male patient who had suffered from single episode of rypical chest oain afrw days before wa referres ro cadiac CT to rule out significant stenoses of the coronary arteries. History of high cholesterol and a positive family history of cardiovascular disease. Since the patient showed a stable … Read more

Multimodality Preoperative Planning and Postoperative Follow-up of a Hybrid Cardiac Intervention

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 9, 2010
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

We describe the case of a 59-year-old man who had aortic regurgitation and a hypoplastic aortic valve and for whom an echocardiography evaluation revealed a vascular tumor in the roof of the left atrium, which was suspected to be a hemangioma. Read more

Advanced techniques in cardiac CT imaging – further lowering the effective radiation dose (H. Alkadhi)

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 26, 2009

Cardiac computed tomography (CT) represents a reliable and accurate modality for the diagnosis and exclusion of coronary artery disease. A huge number of studies have investigated the diagnostic performance of CT coronary angiography among different generations of CT scanners. Nevertheless, radiation doses still remain a matter of concern. Read more

Dual-source CT in step-and-shoot mode: noninvasive coronary angiography with low radiation dose

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Aug 10, 2009
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To prospectively investigate computed tomographic (CT) image quality parameters by using different protocols and to calculate radiation dose estimates for noninvasive coronary angiography performed with dual-source CT in the step-and-shoot (SAS) mode. Read more

A ‘‘dual’’ focus on radiation dose and image quality: Guide paths for cardiac CT

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jul 30, 2009
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Editorial Journal of Cardiovascular Computed Tomography (2008) 2 The number of diagnostic cardiac imaging tests involving x-rays has increased in the past decades. For example, the volume of diagnostic catheter angiography procedures performed in the United States increased from 2.45 million in 1993 to 3.85 million in 2002. (1) Similarly, the … Read more

Multislice Computed Tomography in Infective Endocarditis: Comparison With Transesophageal Echocardiography and Intraoperative Findings

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jun 25, 2009
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Abstract Objectives The aim of this study was to assess the value of multislice computed tomography (CT) for the assessment of valvular abnormalities in patients with infective endocarditis (IE) in comparison with transesophageal echocardiography (TEE) and intraoperative findings. Background Multislice CT has recently shown promising data regarding valvular imaging in a 4-dimensional … Read more

ECR 2009: Dual energy on the way to daily routine (H. Alkadhi)

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jun 12, 2009

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Radiation dose of cardiac CT – what is the evidence?

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | May 25, 2009
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Abstract Current evidence and most pertinent literature on the radiation dose of cardiac computed tomography (CT) for the noninvasive assessment of coronary artery disease are reviewed. The various means for adjusting CT protocols to lower the radiation to a level that is as low as reasonably achievable are discussed. It … Read more

Endoleaks after Endovascular Abdominal Aortic Aneurysm Repair: Detection with Dual-Energy Dual-Source CT

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 30, 2009
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Purpose: To assess the diagnostic performance of dual-energy dual-source computed tomography (CT) in the detection of endoleaks after endovascular abdominal aortic aneurysm (AAA) repair. Materials and Methods: This study was local ethics board approved, and written informed consent was obtained from all patients. One hundred eighteen patients (21 women, 97 men; mean age, … Read more

ACCURATUM: improved calcium volume scoring using a mesh-based algorithm—a phantom study

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 7, 2009
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To overcome the limitations of the classical volume scoring method for quantifying coronary calcifications, including accuracy, variability between examinations, and dependency on plaque density and acquisition parameters, a mesh-based volume measurement method has been developed. It was evaluated and compared with the classical volume scoring method for accuracy, i.e., the normalized … Read more

Radiation dose values for various coronary calcium scoring protocols in dual-source CT

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 29, 2009
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Purpose The purpose of this study was to assess the radiation dose and associated image noise of previously suggested calcium scoring protocols using dual-source CT. Methods One hundred consecutive patients underwent coronary calcium scoring using dual-source CT. Patients were randomly assigned to five different protocols: retrospective ECG-gating and tube current reduction to … Read more

Somatom Definition vs. GE Lightspeed

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 27, 2009
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Bun Yok O. Dy, M.D., China, has sent the following question: Somatom vs Lightspeed CT750HD: We are considering acquisition of a high speed CT with coronary and peripheral capabilities, which would be a better choice, the Siemen’s Somatom DSCT or GE Lightspeed CT 750HD? Hatem Alkadhi, Institute of Diagnostic Radiology, University Hospital Zurich: Dear … Read more

Dual-energy computed tomography for the differentiation of uric acid stones: ex vivo performance evaluation

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 13, 2009
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

We assessed the potential of dual-energy computed tomography (CT) for the differentiation between uric acid (UA)-containing and non-UA-containing urinary stones. Forty urinary stones of 16 different compositions in two sizes (< and >/= 5 mm) were examined in an ex vivo model. Thirty stones consisted of pure calcium oxalate (whewellite or … Read more

Reference values for quantitative left ventricular and left atrial measurements in cardiac computed tomography

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Dec 12, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

To assess reference values for left ventricular (LV) and left atrial (LA) dimensions, global LV function, and LV-myocardial mass for cardiac CT. We examined 120 subjects undergoing a coronary angiography using 64-slice and dual-source CT. All individuals had a low cardiovascular risk, normal ECG, negative biomarkers, and a normal cardiac CT … Read more

DSCT and pediatrics

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Sep 25, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The following question has been sent by Bellalize Steenkamp, radiographer, Unitas Hospital, South Africa: 1) Would you say that the DSCT is better equipped to do Paediatrics than the normal multi-slice CT? 2) In certain cases, due to the less invasive procedure, would you say it is more appropriate than doing an … Read more

DSCT and pediatrics

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Sep 11, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The following question has been sent by Bellalize Steenkamp, radiographer, Unitas Hospital, South Africa: Is there a place for DSCT in paediatric diagnoses? Hatem Alkadhi, M.D., University Hopsital Zurich, Switzerland: Dear Ms Steenkamp Thank you for your question regarding the use of DSCT in pediatric patients. The answer is: Yes. First, you may perform any DSCT … Read more

Low-Dose CT Coronary Angiography in the Step-and-Shoot Mode: Diagnostic Performance

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Aug 11, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Abstract Objective We investigated the performance of low-dose dual-source computed tomography (DSCT) coronary angiography in the step-and-shoot (SAS) mode for the diagnosis of significant coronary artery stenoses in comparison with conventional coronary angiography (CCA). Design, Setting and Patients Prospective, single-center study conducted in a referral center enrolling 120 patients (71 males, age 68 +/-9 … Read more

Protocol Dual energy in gout

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jul 15, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Please, click on the title to see the protocol. Read more

Case: Dual energy in gout

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jul 15, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.
  • case-de-imaging-in-gout-bild-a.jpg
  • case-de-imaging-in-gout-bild-b.jpg

HISTORY A 71-year-old male patient presented with painful swelling of the first metatarsophalangeal joint of the left foot. The routine clinical-chemical work-up showed a slight hyperuricaemia and mild renal insufficiency. In order to conclusively assess the cause of arthritis the patient underwent puncture that, however, was non-diagnostic. Subsequently, the patient underwent … Read more

Aortic aneurysm: diastol or systol?

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jun 4, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The following question has been sent by Sofiane Hadjadj, MD, clinical research, Canada: For the diagnosis and follow-up of aortic aneurysms the aortic ECG guating ct scan have shown it accuracy beside echo, we still no have concensus about which phase we should measure the aortic diameters, some surgeons here prefere … Read more

Subvalvular aortic stenosis: Comprehensive cardiac evaluation with dual-source computed tomography

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | May 16, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Subvalvular aortic stenosis (SAS) represents a fixed obstruction of the left ventricular outflow tract (LVOT) by an endocardial fold, fibrous tissue, or fibromuscular ridge. Echocardiography including color Doppler is the modality of choice to establish the diagnosis and to assess the extent and hemodynamic severity of SAS. We present imaging … Read more

Tako-Tsubo Phenomenon: Dual-Source CT and Conventional Coronary Angiography

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | May 7, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

A 75-year-old woman was admitted to our emergency department with severe chest pain and mild dyspnea that started soon after a marital quarrel with her husband. Her 12-lead electrocardiogaphy (ECG) demonstrated an ST elevation in the precordial leads, and the plasma troponin T level was elevated to 0.29 ng/mL. An … Read more

Hands-on workshop Cardiac CT, Zurich 11th / 12th July 2008

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 17, 2008

Jul 11, 2008 to Jul 12, 2008. Institute for Diagnostic Radiology, University Hospitals Zurich, Switzerland Due to the positive resonance to our recent hands-on workshops, we have retained the workshop content essentially unchanged. We will offer another theoretical basic course that deals with the basics of anatomy and CT physics and goes on to explain the major indications … Read more

Editorial: The revival of step-and-shoot computed tomography

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 16, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The advent of multidetector row spiral computed tomography (CT) is one of the most groundbreaking innovations in the field of diagnostic imaging over the past decade. Because of the high temporal and spatial resolution of recent single-source and dual-source CT scanner types, robust CT imaging of the coronary arteries has … Read more

DSCT coronary angiography: influence of obesity, calcium load, and heart rate on diagnostic accuracy

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Apr 16, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Aims: To prospectively investigate the diagnostic accuracy of dual-source computed tomography coronary angiography (CTCA) to diagnose coronary stenoses in relation to body mass index (BMI), Agatston score (AS), and heart rate (HR) as compared with catheter coronary angiography (CCA). Methods and results: Hundred and fifty consecutive patients (47 female, mean age … Read more

Urinary stone-characterization with Dual Energy

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Mar 4, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The following question has been sent by Luke Riverstone, Radiographer, Qscan Radiology Clinics, Australia: We have recently obtained a Siemens DSCT.  We performed our first DE KUB the other day and the Dual Energy Software indicated that there was 1 Kidney stone that was of a Uric Acid composition and 1 was … Read more

Dual-Energy Contrast-Enhanced Computed Tomography for the Detection of Urinary Stone Disease

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Feb 12, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Abstract Objectives: To assess the value of dual-energy contrast-enhanced computed tomography (CT) imaging for the detection of urinary stone disease using dual-source CT. Materials and Methods: Forty consecutive patients (mean age 46.6 ± 16.2 years, range 27–85 years) suspected of having urinary stone disease underwent dual-source CT of the urinary tract. A … Read more

Step-and-Shoot Mode: 0.9 mSv Effective Dose

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 2, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Please click on the title to see the protocol. Read more

Case: Step-and-Shoot Mode: 0.9 mSv Effective Dose

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Jan 2, 2008
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Case history A 51-year-old male patient, who had suffered a single episode of atypical chest pain a few days prior, was referred to cardiac CT to rule out severe calcification and significant stenoses of the coronary arteries. The patient had a history of high cholesterol as well as a positive family … Read more

Objective methods to determine minimal required Kv and mAs for DSCT cardiac

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Dec 12, 2007
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

The following question has been asked by Y.S.Lee, Singapore: Objective methods to determine minimal required Kv and mAs for DSCT cardiac: For DS cardiac CT, the optimal Kv and mAs used by radiographers at time can be suboptimum depending on their experiences. Using BMI method, can at … Read more

Combining Dual-Source Computed Tomography Coronary Angiography and Calcium Scoring: Added Value for the Assessment of Coronary Artery Disease

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 30, 2007
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Abstract Objective: To prospectively investigate the diagnostic accuracy of dual-source 64-slice computed tomography coronary angiography (CTCA), calcium scoring (CS), and both methods combined for assessing significant coronary artery stenoses relative to conventional coronary angiography (CCA). Design, Setting and Patients: Prospective, single-center study conducted in a referral center enrolling 74 consecutive patients … Read more

Case: Dual Source peripheral Run-off

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 21, 2007
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

SOMATOM Definition vascular CTA History A 71-year-old man arrives in the University Hospital Zurich with a long history of diabetes. After short walks of 100 meter the patient complains of severe pain in the lower extremities, forcing him to pause. In the initial ultrasound diagnosis a severe occlusion of the left arteria … Read more

Dual-source computed tomography in patients with acute chest pain: feasibility and image quality

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 16, 2007
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Abstract The aim of this study was to determine the feasibility and image quality of dual-source computed tomography angiography (DSCTA) in patients with acute chest pain for the assessment of the lung, thoracic aorta, and for pulmonary and coronary arteries. Sixty consecutive patients (32 female, 28 male, mean age 58.1± 16.3 … Read more

Radiation dose estimates in dual-source computed tomography coronary angiography

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 16, 2007
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Abstract The purpose of this study was to quantify radiation dose parameters of dual-source CT coronary angiography. Eighty patients underwent contrast-enhanced, retrospectively ECG-gated dual-source CT coronary angiography with heart rate-adapted ECG pulsing using two algorithms: In 40 patients, the tube current was reduced to 20% (Amin1) of the normal tube current … Read more

Image Quality and Reconstruction Intervals of Dual-Source CT Coronary Angiography

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 16, 2007
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Recommendations for ECG-Pulsing Windowing Abstract Purpose: To evaluate reconstruction intervals and image quality in dual-source computed tomography (DSCT) coronary angiography for optimal placement of the ECG-pulsing window. Materials and Methods: DSCT coronary angiography was performed in 60 patients. Thirteen datasets were reconstructed in 5% increments from 20–80%. Two readers independently assessed image quality … Read more

Accuracy of dual-source CT coronary angiography: first experience in a high pre-test probability population without heart rate control

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 16, 2007
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Abstract The aim of this study was to assess the diagnostic accuracy of dual source computed tomography (DSCT) for evaluation of coronary artery disease (CAD) in a population with extensive coronary calcifications without heart rate control. Thirty patients (24 male, 6 female, mean age 63.1±11.3 years) with a high pre-test probability … Read more

Dual-Source CT Coronary Angiography: Image Quality, Mean Heart Rate, and Heart Rate Variability

posted by Hatem Alkadhi, M.D., M.P.H., E.B.C.R. | Nov 16, 2007
Hatem Alkadhi, M.D., M.P.H., E.B.C.R.

Abstract Objective. The purpose of this study was to evaluate the effect of mean heart rate and heart rate variability on the image quality of dual-source CT coronary angiography. Subjects and methods. Eighty patients underwent dual-source CT coronary angiography. Thirteen data sets were reconstructed in 5% steps from 20–80% of the R-R … Read more




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