Radiation dose for coronary CTA 256 vs 64 detectors

Case contributed by Jayanth Keshavamurthy
Diagnosis not applicable


Cardiac volunteer to fine tune cardiac CTA techniques. He was the volunteer on 64 slice and the 256 slice 4 years apart. Both techniques are cardiac gated retrospective techniques.

Patient Data

Age: 45 years
Gender: Male

Series 2 on both is calcium score dosing.

Series 3 in first is gated retrospective CCTA.

Series 5 in second one has 10 phases and gated retrospective dosing,  

Case Discussion

With 256 detectors there is significant dose reduction (2/3 reduction) for cardiac gated CT angiograms.

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