Advantages of cardiac scanning with DSCT and flash scanning

The following question has been sent by Mahmood Tehrai:

Advantages of cardiac scanning with DSCT and flash scanning: can you let me know the cardiac scanning advantages of DSCT and Flash over other cardiac techniques like mri, spect, pet, invasive angio

Harald Seifarth, MD, Department of Clinical Radiology, University of Muenster, Germany:

The advantge of DSCT in cardiac imaging is the good temporal resolution. The temporal resolution of the Definition is 83 ms and in the Flash it is even 75 ms, providing good image quality at high heart rates (see paper). The Definition Flash also has a wide detector that allows to acquire the entire heart in only about 4 heart beats (depending on the size of the heart) in the step and shoot mode. The scan time usually is about 5 seconds.
The Flsh mode is a new scan mode that makes it possible to image the entire heart in only one heart beat. The trade off is that this mode can only be used in low heart rates. The big advantage however is that the dose is very low. Depending on the scan length, in some patients the dose is below 1 mSv.