Radiologic Science physics bushong ch 8 9 10 11 Questions with Answers

grays in air the measurement for ray - exposure mR Air Kerma mAs the number of x-rays in the useful beam defines x-ray - quantity standard x-ray machines produce about ____ uGya/mAs at 70kVp at 100cm SID - 50 uGya or 5 mR x-ray quantity increase in direct proportion to increase in - mAs If distance from the source to the image SID is reduced by half, how is the x-ray intensity at the image affected? - Increased by a factor of 4 If filter thickness is ______ then xray intensity is ______ - increased, decreased; decreased, increased If the quantity of electron hitting the target are doubled, the x-ray quantity is - doubled or increased a 100% The inverse square law has the same effect on optical density and x-ray - intensity, exposure, quantity, mAs, and density An increase of 15% in kVp is equivalent to increasing mAs - double, 2 times, or 100% The penetrability of an x-ray beam is called x-ray - quality Beam quality is affected by - kVp and filtration Half value layer (HVL) measuring x ray beam - quality halfed The HVL is lowered by decreasing - kVp The main purpose of added filtration is to reduce - patient dose