ARRT Formulas Exam Questions And
Answers
Equivalent Dose -
correct answer ✅Sv = Gy x WR
Effective Dose -
correct answer ✅Sv = Gy x WR x WT
Beam Intensity When SID Changes -
correct answer ✅I1/I2 = D2^2/D1^2
Magnification Factor -
correct answer ✅SID/SOD
Penumbra -
correct answer ✅FSS x OID/SOD
If SID changes, need to calculate new mAs to keep same receptor
exposure: Exposure Maintenance Formula -
correct answer ✅mAs1/mAs2 = D1^2/D2^2 (old mAs/new mAs =
old D1^2/ new D2^2)
Answers
Equivalent Dose -
correct answer ✅Sv = Gy x WR
Effective Dose -
correct answer ✅Sv = Gy x WR x WT
Beam Intensity When SID Changes -
correct answer ✅I1/I2 = D2^2/D1^2
Magnification Factor -
correct answer ✅SID/SOD
Penumbra -
correct answer ✅FSS x OID/SOD
If SID changes, need to calculate new mAs to keep same receptor
exposure: Exposure Maintenance Formula -
correct answer ✅mAs1/mAs2 = D1^2/D2^2 (old mAs/new mAs =
old D1^2/ new D2^2)
