Ralf Bauer
Ralf Bauer, M.D.

Associate professor, head of CT research – Expert in pulmonary vascular/lung imaging, cardiovascular

Curriculum vitae

All posts of Ralf Bauer, M.D.

Estimation and comparison of effective dose (E) in standard chest CT by organ dose measurements and dose-length-product methods and assessment of the influence of CT tube potential (energy dependency) on effective dose in a dual-source CT.

posted by Ralf Bauer, M.D. | Dec 13, 2016
Ralf Bauer, M.D.

Purpose: To determine effective dose (E) during standard chest CT using an organ dose-based and a dose-length-product-based (DLP) approach for four different scan protocols including high-pitch and dual-energy in a dual-source CT scanner of the second generation. Read more

Dual-Energy CT-based Display of Bone Marrow Edema in Osteoporotic Vertebral Compression Fractures: Impact on Diagnostic Accuracy of Radiologists with Varying Levels of Experience in Correlation to MR Imaging.

posted by Ralf Bauer, M.D. | Nov 11, 2016
Ralf Bauer, M.D.

Purpose: To evaluate whether a dual-energy (DE) computed tomographic (CT) virtual noncalcium technique can improve the detection rate of acute thoracolumbar vertebral compression fractures in patients with osteoporosis compared with that at magnetic resonance (MR) imaging depending on the level of experience of the reading radiologist. Read more

Value of a noise-optimized virtual monoenergetic reconstruction technique in dual-energy CT for planning of transcatheter aortic valve replacement

posted by Ralf Bauer, M.D. | Oct 21, 2016
Ralf Bauer, M.D.

Objectives: To evaluate objective and subjective image quality of a noise-optimized virtual monoenergetic imaging (VMI+) reconstruction technique in dual-energy computed tomography (DECT) angiography prior to transcatheter aortic valve replacement (TAVR). Read more

Low-dose abdominal CT for detection of urinary stone disease – Impact of additional spectral shaping of the X-ray beam on image quality and dose

posted by Ralf Bauer, M.D. | Sep 9, 2016
Ralf Bauer, M.D.

Objective: To evaluate a novel tin filter-based abdominal CT protocol for urolithiasis in terms of image quality and CT dose parameters. Read more

Case: Dual Energy Perfusion Maps Reveal the Extent of Perfusion Deficits from Multiple Peripheral Pulmonary Emboli

posted by Ralf Bauer, M.D. | Aug 23, 2016
Ralf Bauer, M.D.
  • http://health.siemens.com/ct_applications/somatomsessions/index
  • 2016-07-26_tabele3

A 58-year-old female patient presented to the emergency department complaining of shortness of breath and acute chest pain. History revealed an extended immobility due to long distance travel and further risk factors such as smoking and female gender. Risk of pulmonary embolism according to the Wells’ score was elevated, as … Read more

Dual-Energy CT: Applications in Abdominal Imaging

posted by Ralf Bauer, M.D. | May 20, 2015
Ralf Bauer, M.D.

This article is supposed to give a current update on possible applications of DECT in the abdomen and their evidence. Read more

Dual-energy CT applications in head and neck imaging

posted by Ralf Bauer, M.D. | Jan 15, 2014
Ralf Bauer, M.D.

As with other body regions, both image fusion and material characterization dual-energy applications can be used for head and neck imaging. Read more

Dose and image quality of high-pitch dual source CT for the evaluation of cervical lymph node status – Comparison to regular 128-slice single source CT

posted by Ralf Bauer, M.D. | Jul 1, 2013
Ralf Bauer, M.D.

A high-pitch dual-source CT (DSCT) was compared to a standard single-source CT protocol in terms of dose and image quality for malignant lymphoma staging. Read more

Bolus timing in high-pitch CT angiography of the aorta

posted by Ralf Bauer, M.D. | Jun 14, 2013
Ralf Bauer, M.D.

To investigate the bolus geometry in high-pitch CT angiography (CTA) of the aorta without ECG synchronisation in comparison to single-source CT. Read more

Case: Flash CT Pulmonary Angiography in a Freely Breathing Patient

posted by Ralf Bauer, M.D. | Sep 14, 2012
Ralf Bauer, M.D.
  • Pulmonary_Embolism_Fi_1
  • Pulmonary_Embolism_Fi_2
  • Pulmonary_Embolism_Fi_3
  • Pulmonary_Embolism_Fi_4

As shown in the present case, with a pitch of 3.0, patient motion can be virtually frozen. This allows CTPA to be performed in a freely breathing patient and, avoids breath-hold induced interruptions of the contrast column. Read more

High-pitch DSCT Pulmonary Angiography in Freely Breathing Patients

posted by Ralf Bauer, M.D. | May 15, 2012
Ralf Bauer, M.D.

High-pitch dual-source CTPA in freely breathing patients effectively produces images that are free of artifacts related to breathing and cardiac motion. Hence, Valsalva-related artifacts can be eliminated using this technique. Read more

3. Cardio CT Hands-on-Workshop, Frankfurt, Germany

posted by Ralf Bauer, M.D. | Feb 21, 2012

Nov 17, 2012 to Nov 18, 2012. We will cover the whole spectrum from anatomical variations, plaque imaging, and bypasses to functional assessments. The workshop is held in German language. Read more

Dose and image quality at CT pulmonary angiography – comparison of first and second generation dual-energy CT and 64-slice CT

posted by Ralf Bauer, M.D. | Sep 8, 2011
Ralf Bauer, M.D.

To compare dose and image quality of 64-slice, first and second generation dual-energy CT (DECT) for CT pulmonary angiography (CTPA). Read more

Dual energy CT pulmonary blood volume assessment in acute pulmonary embolism – correlation with D-dimer level, right heart strain and clinical outcome

posted by Ralf Bauer, M.D. | Aug 4, 2011
Ralf Bauer, M.D.

To investigate the role of perfusion defect (PD) size on dual energy CT pulmonary blood volume assessment as predictor of right heart strain and patient outcome and its correlation with d-dimer levels in acute pulmonary embolism (PE). Read more

Lung perfusion analysis with dual energy CT in patients with suspected pulmonary embolism – Influence of window settings on the diagnosis of underlying pathologies of perfusion defects

posted by Ralf Bauer, M.D. | Jul 13, 2011
Ralf Bauer, M.D.

This study looks on lung perfusion analysis with dual energy CT (DECT) and investigates the influence of different window settings on the identification of the underlying pathologies for different patterns of perfusion defects (PD). Read more

3. Dual Energy CT Hands-on-Workshop, Frankfurt, Germany

posted by Ralf Bauer, M.D. | Jun 7, 2011

Sep 17, 2011; We will focus on Dual Energy applications that are internationally established in the clinical routine so far. The workshop is held in German language. Read more

Dual-energy CT for the assessment of chronic myocardial infarction in patients with chronic coronary artery disease: comparison with 3-T MRI

posted by Ralf Bauer, M.D. | Apr 18, 2011
Ralf Bauer, M.D.

The purpose of this article is to compare the performance of dual-energy CT with that of 3-T MRI with late enhancement for the detection of chronic myocardial infarction during first-pass coronary CT angiography (CTA). Read more

Computer-Based Automated Left Atrium Segmentation and Volumetry from ECG-Gated Coronary CTA Data: Comparison with Manual Slice Segmentation and Ultrasound Planimetric Methods

posted by Ralf Bauer, M.D. | Mar 28, 2011
Ralf Bauer, M.D.

The prototype software showed excellent agreement with manual slice segmentation with the least time consumption. Read more

Case: Ruling out Coronary Artery disease with 0.69 mSv

posted by Ralf Bauer, M.D. | Mar 8, 2011
Ralf Bauer, M.D.
  • Fig 1: Volume Rendered display of  the major coronary arteries underlined with MPR
  • Fig 2: Caudo-Cranial view of the distal part of the RCA and PDA.
  • Fig 3: Curved planar reformatted display of the RCA.
  • Fig 4: Curved planar reformatted display of the LAD.

Coronary CTA using 100 kV tube potential and the FLASH spiral acquisition mode allowed ruling out coronary artery disease in this normal-sized adult patient with a DLP of 49 in only 0.29 s scan time without the use of beta blockers. Read more

Case: Dual Energy Coronary CTA for Evaluation of Chest Pain after RCA Revascularization

posted by Ralf Bauer, M.D. | Feb 2, 2011
Ralf Bauer, M.D.
  • Fig. 1 Prior to recanalization: Cardiac catheterization showed a prominent RV branch and in-stent occlusion of the mid and distal RCA.
  • Fig. 2 Curved multiplanar reformates showed in-stent thrombosis with occlusion beginning in the proximal RCA. In the RV branch, which was clearly visible on pre-interventional cath images, no contrast material filling could be delineated.
  • Fig. 3 Dual Energy iodine mapping showed a large area with decreased perfusion in the arterial phase in the inferoseptal wall extending from the base to the apex of the heart.
  • Fig. 4 Late enhancement was present in the inferoseptal wall corresponding to the perfusion defect in arterial phase.

In this case, Dual Energy coronary CTA was used to image a complication of interventional recanalization, i.e. acute in-stent thrombosis, while the initial clinical diagnosis of acute aortic dissection could reliably be ruled out. Read more

Case: Diagnosis of ruptured cocaine capsules in the rectum of bodypacker

posted by Ralf Bauer, M.D. | Dec 30, 2010
Ralf Bauer, M.D.
  • Fig. 1 Cocaine capsules distributed throughout the whole gut.
  • Fig. 2 Virtual colonoscopy view.
  • Fig. 3 Virtual colonoscopy view.

With the use of DECT, the reliable diagnosis of ruptured cocaine capsule could be made and immediate medical help could be provided. Further, we are happy to be able to report as the first institute on the Dual Energy behavior of Columbian cocaine. Read more

Dual-energy CT for the assessment of chronic myocardial infarction in patients with chronic coronary artery disease: comparison with 3-T MRI

posted by Ralf Bauer, M.D. | Oct 12, 2010
Ralf Bauer, M.D.

The purpose of this article is to compare the performance of dual-energy CT with that of 3-T MRI with late enhancement for the detection of chronic myocardial infarction during first-pass CTA. Read more

2. Dual Energy CT Hands-on-Workshop, Frankfurt, Germany

posted by Ralf Bauer, M.D. | Sep 9, 2010

Nov 13, 2010; 08:30 to 16:00. We will focus on Dual Energy applications that are internationally established in the clinical routine so far. The workshop is held in German language. Read more

CT coronary angio

posted by Ralf Bauer, M.D. | Jul 6, 2010
Ralf Bauer, M.D.

The following question has been sent by Akhilesh Singh: CT coronary angio – what is the normal range of calcium score? Ralf Bauer,  MD, Clinic of the Goethe University, Frankfurt, Germany: Dear Mr. Singh, thank you for your question! But actually, it is not easy to answer. First, there is no real “normal” range. … Read more

Case: Adult CAD Rule out Flash

posted by Ralf Bauer, M.D. | Mar 19, 2010
Ralf Bauer, M.D.
  • Case: Adult CAD Rule out Flash
  • Case: Adult CAD Rule out Flash
  • Case: Adult CAD Rule out Flash
  • Case: Adult CAD Rule out Flash

Case history: 68 year old patient with atypical chest pain complaints and know year-long arterial hypertension. Ultrasound showed concentric LV hypertrophy and aortic valve stenosis grade 1. Rule out coronary artery disease. Resting heart rate was 50 bpm and no betablockers were injected. Read more

Recommended Reading about Dual Source CT and reducing radiation exposure

posted by Ralf Bauer, M.D. | Feb 3, 2010
Ralf Bauer, M.D.

The following question has been sent by Patrick, CT Tech: Our facilty is currently operating a siemens Definition Scanner. I was hoping you could recommend some reading material on Dual Source CT. Also some info on how to reduce radiation exposure. Ralf Bauer, MD, Clinic of the Goethe University, Frankfurt, Germany: Dear … Read more

Compound analysis of gallstones using dual energy computed Tomography – Results in a phantom model

posted by Ralf Bauer, M.D. | Nov 12, 2009
Ralf Bauer, M.D.

The potential of dual energy computed tomography (DECT) for the analysis of gallstone compounds was investigated. The main goal was to find parameters, that can reliably define high percentage (> 70 %) cholesterol stones without calcium components. Read more

Pulmonary embolism with Dual Energy LungPBV

posted by Ralf Bauer, M.D. | Mar 4, 2009
Ralf Bauer, M.D.

Tips and tricks As the FOV is limited to 26 cm due to the smaller detector of the B-system, it is very important to place the patient centrally in the scan field to cover as much lung parenchyma as possible. Use a lateral and … Read more




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