Technical Aspects of Cardiac CT - ImPACT CT Scanner Evaluation ...
Technical Aspects of Cardiac CT - ImPACT CT Scanner Evaluation ...
Technical Aspects of Cardiac CT - ImPACT CT Scanner Evaluation ...
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Helical cardiac <strong>CT</strong>– ECG dose modulation<br />
• Tube current (mA) decreased to a prescribed<br />
minimum value outside phase region <strong>of</strong> interest<br />
– eg 20%, 4% <strong>of</strong> maximum dose<br />
• Full dose at required phase region, with a margin<br />
• Other phases can still be used for functional study<br />
Radiation on<br />
Reconstruction phase<br />
Available for image recon.<br />
100%<br />
100%<br />
20%<br />
4%<br />
Harefield <strong>Cardiac</strong> Course