Medical Dosimetrist Certification Board Practice
Test Exam UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
DVH - CORRECT ANSWER Graph showing volume receiving dose within a specified
range.
QUANTEC - CORRECT ANSWER Organization setting dose tolerances for treatment
plans.
Clinical electron beams - CORRECT ANSWER Electrons lose energy at a rate of 2
MeV per cm in soft tissue.
Dose uniformity factors - CORRECT ANSWER Beam energy, tissue inhomogeneity,
and patient thickness.
Dose calculation uncertainty - CORRECT ANSWER Best accounted for by Monte
Carlo method.
IMRT technique - CORRECT ANSWER Patient treated slice by slice with intensity-
modulated beams.
Thermal neutron absorber - CORRECT ANSWER Boronated polyethylene.
Relative skin dose increase - CORRECT ANSWER Increased by increasing bolus
material thickness.
Symptomatic radiation pneumonitis - CORRECT ANSWER Risk increased by certain
chemotherapy agents.
Arrow #2 - CORRECT ANSWER Points to pancreas.
, V20 of total lung - CORRECT ANSWER Cannot be determined from the graph.
DVHs confirmation - CORRECT ANSWER Confirms normal tissue tolerances are
respected.
Sliding window vs. step-and-shoot - CORRECT ANSWER Sliding window likely has
higher total monitor units.
Photon field abuts electron field - CORRECT ANSWER Results in photon side hot
spot, electron side cold spot.
Arrow #1 - CORRECT ANSWER Points to maxillary sinus.
Isocentric, parallel opposed oblique fields - CORRECT ANSWER May result in
decreasing max dose as isocenter dose increases.
Increased skin dose in IMRT - CORRECT ANSWER Caused by use of high-energy
photons.
Incorrectly labeled organ - CORRECT ANSWER Stomach in the CT scan.
increased skin dose in IMRT for prostate cancer - CORRECT ANSWER Factors
include prone position, wedge under knees, use of high-energy photons, and carbon fiber
couch.
organ INCORRECTLY labeled in CT scan - CORRECT ANSWER Options are liver,
stomach, left kidney, and aorta.
radiation beam delivery in step-and-shoot IMRT - CORRECT ANSWER The correct
process involves MLC movement direction and beam delivery.
Test Exam UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
DVH - CORRECT ANSWER Graph showing volume receiving dose within a specified
range.
QUANTEC - CORRECT ANSWER Organization setting dose tolerances for treatment
plans.
Clinical electron beams - CORRECT ANSWER Electrons lose energy at a rate of 2
MeV per cm in soft tissue.
Dose uniformity factors - CORRECT ANSWER Beam energy, tissue inhomogeneity,
and patient thickness.
Dose calculation uncertainty - CORRECT ANSWER Best accounted for by Monte
Carlo method.
IMRT technique - CORRECT ANSWER Patient treated slice by slice with intensity-
modulated beams.
Thermal neutron absorber - CORRECT ANSWER Boronated polyethylene.
Relative skin dose increase - CORRECT ANSWER Increased by increasing bolus
material thickness.
Symptomatic radiation pneumonitis - CORRECT ANSWER Risk increased by certain
chemotherapy agents.
Arrow #2 - CORRECT ANSWER Points to pancreas.
, V20 of total lung - CORRECT ANSWER Cannot be determined from the graph.
DVHs confirmation - CORRECT ANSWER Confirms normal tissue tolerances are
respected.
Sliding window vs. step-and-shoot - CORRECT ANSWER Sliding window likely has
higher total monitor units.
Photon field abuts electron field - CORRECT ANSWER Results in photon side hot
spot, electron side cold spot.
Arrow #1 - CORRECT ANSWER Points to maxillary sinus.
Isocentric, parallel opposed oblique fields - CORRECT ANSWER May result in
decreasing max dose as isocenter dose increases.
Increased skin dose in IMRT - CORRECT ANSWER Caused by use of high-energy
photons.
Incorrectly labeled organ - CORRECT ANSWER Stomach in the CT scan.
increased skin dose in IMRT for prostate cancer - CORRECT ANSWER Factors
include prone position, wedge under knees, use of high-energy photons, and carbon fiber
couch.
organ INCORRECTLY labeled in CT scan - CORRECT ANSWER Options are liver,
stomach, left kidney, and aorta.
radiation beam delivery in step-and-shoot IMRT - CORRECT ANSWER The correct
process involves MLC movement direction and beam delivery.
