Dual Source CT - Cardiac Sequence

SOMATOM Definition Cardiac Scanning

Joerg Hausleiter, MD; Franziska Herrmann, MD; Stefan Martinoff, MD
German Heart Center, Munich, Germany
 |  2007-07-25

History

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.

 

Diagnosis
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)

 

Comments
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.
 

 

Examination Protocol

Scanner
SOMATOM Definition
Exposure time
2s
kV
100 kV
Effective mAs
197 mAs
Rotation time
0.33 s
Temporal resolution
83 ms
Slice collimation
0.6 mm
Reconstructed slice thickness
0.6 mm
Effective dose                              
 1.5 mSv
Contrast material volume                
80 ml
Flow rate
5 ml/s
Saline chaser bolus
50 ml, 5 ml/s

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