Stephan Achenbach, M.D.

This study investigates the sensitivity and specificity of dual-source CT (DSCT) to detect and rule out significant coronary stenoses in patients with atrial fibrillation referred for invasive coronary angiography. Read more

Does iterative reconstruction in general and IRIS specifically decreased blooming artifact from calcific plaque in coronary cta and to what extent. Is there a difference between the benefits derived from IRIS between its use with the Definition scanner versus the Flash? Read more

Objective We evaluated radiation exposure and image quality of a new coronary CT angiography protocol, high-pitch spiral acquisition, using dual source CT (DSCT). Materials and methods Coronary CTA was performed in 25 consecutive patients with a stable heart rate of 60 bpm or less after premedication, using 2 x 128 0.6-mm sections, 38.4-mm … Read more

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The following question has been sent by Antonio Maestro: Use of Flash and DE to replace SPECT in detection of ischemia tests? Hi, i am doing a research to assess the clinical and patient workflow results of using a DSCT Definition Flash for the Chest Pain Unit patients. It seems clear to me … Read more

Sofiane Hadjadj, MD, Montreal, has sent the following question: concerning a recent publication on accuracy of the MDCT 64: according to the study published in the  NEJM Volume 359:2324-2336   \”The patient-based diagnostic accuracy of quantitative CT angiography for detecting or ruling out stenoses of 50% or more according to conventional angiography revealed … Read more

The following question was sent by E.I. Steenkamp, South Africa: Can you direct me to specific articles explaining the pros (and cons) of Cardiac CT and its place in Cardiology? Cardiac CT in general please. I also would like some specific information why the DSCT … Read more

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The following question has been sent by Judy Oltman, CTA Technologist, USA: Medical implants and CT exposure: The articles concerning the use of CT scans and the malfunction of implanted medical devices are vague. They don’t give parameters of kVP, patient body habitus, and or types of scans. I have searched … Read more

The following question has been sent by Sofiane Hadjadj, MD, clinical research, Canada: hi, we have just aquired the dual source ct, and I am very impressed by the quality of images for coro ct even with high calccium scoring, my question is regarding the EKG editing, are their any rules … Read more

Case history • 63 year old male patient • Known chronic occlusion of LAD • Previous bypass surgery • Now experienced an ACS • High grade stenosis of left main coronary artery was found Percutaneous coronary intervention (PCI) and stent placement (5.0/12 mm) of the left main coronary artery was performed to restore blood flow to … Read more

The following question has been sent by Judy Oltmann, CTA Technologist, USA: Resolution of Definition Axial Datasets: My question may have appeared vaque before. My radiology group has had a consistent complaint concerning the mottle or graininess, both terms applied, to the axial datasets acquired during our coronary scans with the Definition … Read more

Abstract Multi-detector computed tomography (CT) scanners, by virtue of their high temporal and spatial resolution, permit imaging of the coronary arteries. However, motion artifacts, especially in patients with higher heart rates, can impair image quality.We thus evaluated the performance of a new dual-source CT (DSCT) with a heart rate independent temporal … Read more

The following question has been sent by Rusli Muljadi M.D., Indonesia: How to make good picture in arythmia patient: We have performed cardiac CT of 3 patient with arythmia by Dual source CT. The pictures show motion artifact/ … Read more

Case history 49-year-old patient with atypical chest pain and an equivocal bicycle stress test (non-significant ST segment depression in the anterior leads). Question The relative young age of the patient, atypical nature of the chest pain, and equivocal stress test make coronary artery disease rather unlikely. Thus, coronary CTA was performed to rule … Read more

Case history 43-year-old patient with acute chest pain, not entirely typical for myocardial infarction. ST segment elevation [fig. 1] and enzyme elevation. Echo was normal. Question Myocarditis versus myocardial infarction: Can coronary stenoses/occlusions be ruled out? Diagnosis / Differential diagnosis Chest pain and ST segment elevation are the lead symptoms of acute myocardial infarction. Here, … Read more

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With their small dimensions and fast motion, the coronary vessels are not easy to interpret by CT and impeccable image quality is a prerequisite to reliably detect or rule out stenoses. Owing to its high temporal and spatial resolution Dual Source CT should allow for reliable assessment of the coronary … Read more