CT dose index, True is:
B. i.e. In pediatrics patient dose should be reduced Because ionizing radiation causes more biological effect in children, it is impoant to adapt CT technical parameters to minimize radiation doseQ. CT Dose index (CTDI) - Is most common parmeter to estimate and minimize patient dose in CTQ. - Integrates the dose delivered both within & beyond the scan volume. Factors that influence radiation dose from CT: KVp (Kilovoltage) - has nonlinear relationship with radiation doseQ - An t in 120-130 KVp can double radiation doseQ. Tube current (mAs) - has linear relationship with radiation dose - I mAs by 50% : ies radiation twice Pitch (Slice - is inversely propoional to radiation thickness/Table speed) dose.
By reducing KVP by 50% radiation dose is reduced to half
In pediatric patients dose should be reduced
CT dose index is not useful for control exposure in multi-slice CT
KV has no control over CT dose index