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What is CT dose index, True is: and explain in detail?
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.