ARRT Formulas Questions and Answers
100% Correct
Magnification & OID Formula Correct Answ_Image size/Object Size = SID/ SOD (SID-
OID)
mAs & Exposure Time Correct Answ_mAs/mA
Grid conversion formula Correct Answ_New grid bucky/old grid bucky x mAs
Image Width Formula Correct Answ_iw/ow = SID/SOD
iw = image width
ow = object
The exposure factors of 400 mA, 17 ms, 82 kVp will produce a mAs of? Correct Answ_400
mA x .017 second = 6.8 mAs
Equivalent Dose Correct Answ_Sv = Gy x WR
100% Correct
Magnification & OID Formula Correct Answ_Image size/Object Size = SID/ SOD (SID-
OID)
mAs & Exposure Time Correct Answ_mAs/mA
Grid conversion formula Correct Answ_New grid bucky/old grid bucky x mAs
Image Width Formula Correct Answ_iw/ow = SID/SOD
iw = image width
ow = object
The exposure factors of 400 mA, 17 ms, 82 kVp will produce a mAs of? Correct Answ_400
mA x .017 second = 6.8 mAs
Equivalent Dose Correct Answ_Sv = Gy x WR