MedScape. Impact by those factors:
- Tube current (mA): linear +
- Peak kilovoltage (kVp): nonlinear +
- Pitch (defined as table distance traveled in one 360° rotation/total collimated width of the X-ray beam, see RadioPaedia): -
Specifically, increasing the pitch from 1.0 to 1.5 will reduce the patient dose by 33%. Most body CT scanning, especially in children, is performed at pitches between approximately 1.0 to 1.5.
- Gantry cycle time (in seconds): linear +
The faster the gantry rotation, the lower the dose.