Dual Source CT - Cardiac Sequence
SOMATOM Definition Cardiac Scanning
Joerg Hausleiter, MD; Franziska Herrmann, MD; Stefan Martinoff, MD
German Heart Center, Munich, Germany
A 66-year old male patient was presented to rule out severe calcification and significant stenosis. The patient had a history of high cholesterol as well as a family history of cardiovascular disease. Since the patient was free of symptoms and showed a stable heart rate, a cardiac sequence mode was selected to achieve the lowest possible radiation exposure.
Calcium scoring excluded significant calcifications, with the resulting score below the age-related 10th percentile. CT Angiography did not reveal any high-grade stenosis, with multiple very minor soft plaques without any hemodynamic relevance. (Fig. 1-3)
The SOMATOM Definition, as the world’s first Dual Source CT, allows for a true temporal resolution of 83 ms and thus increases robustness for cardiac scanning. Here a coronary CT angiography was performed with cardiac sequence technique, a so-called step-and-shoot mode. For this, a prospectively triggered acquisition mode is used resulting in lowest possible radiation exposure. In this patient (BMI 26.6) the CTA was performed with an effective dose of 1.5 mSv.
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