<prompt> Regarding CT scan all are true except -50 reduction in kVp reduces 50 radiation doseDecrease in mA milli amperes decreases radiation dose exposure significantly in pediatric chestQuality of the radiation generated depends upon voltageRadiation dose exposure is directly related to the time of exposure  <response>: Quantity of exposure radiation dose is directly propoional to kVp2 so reducing kVp by 50 will reduce the radiation dose to 25 i.e 75 reduction in radiation dose 