Regarding CT scan all are true except -
Quantity of exposure (radiation dose) is directly propoional to (kVp)2 so reducing kVp by 50% will reduce the radiation dose to 25 % (i.e 75% reduction in radiation dose)
50% reduction in kVp reduces 50% radiation dose
Decrease in mA (milli amperes) decreases radiation dose exposure significantly in pediatric chest
Quality of the radiation generated depends upon voltage
Radiation dose exposure is directly related to the time of exposure
Fundamentals in Radiology