MDCB LATEST 2026 TEST PAPER QUESTIONS AND
ANSWERS MARKED A+
✔✔D2 - ✔✔Maximum total dose in Gy to any point 2cm or greater away from the PTV in
any direction
✔✔V12<5-10cc - ✔✔Brain volume SRS 1 fx
✔✔2mm; 1 degree - ✔✔TG-142 suggests monthly QA tolerances for lateral,
longitudinal, and rotational couch positions for IMRT to be
✔✔2mm, 1% on a side - ✔✔TG-142 suggests monthly QA tolerances for
mechanical/light field coincidence for IMRT to be
✔✔2% - ✔✔TG-142 suggests monthly QA tolerances for electron output constancy for
IMRT to be
✔✔R50 - ✔✔the ratio of the volume of 50% of the prescription dose isodose to the
volume of the PTV
✔✔2mm - ✔✔TG-40 suggests daily QA tolerances for laser localization for simulators to
be
✔✔2mm - ✔✔TG-40 suggests annual QA for medical accelerator tolerances for gantry
rotation isocenter to be
✔✔<32% - ✔✔Kidney V20
✔✔E, FS, d, SSD - ✔✔PDD is dependent on
✔✔E, FS, d - ✔✔TMR is dependent on
✔✔3.7 x 10^10 Bq - ✔✔1 Ci =? Bq
✔✔10^6 - ✔✔mega (M)
✔✔alpha particle, 1MV, 250kVp, Co-60 - ✔✔Rank LET from highest to lowest: 1MV,
alpha particle, 250kVp, Co-60
✔✔1mSv - ✔✔100mrad = ? dose equivalent
✔✔<12 Gy - ✔✔Optic Nerve/Chiasm SRS 1 fx Dmax
,✔✔target, Primary collimator, flattening filter, dose chambers, secondary collimator -
✔✔What is the correct order of components in treatment head to generate x-rays?
✔✔6Mv - ✔✔Which linac energy requires the highest beam current
✔✔Leukemia - ✔✔Which is considered a stochastic effect?
Cataracts, Erythema, Sterility, Leukemia
✔✔Slightly greater - ✔✔The lateral penumbra of a proton field is ______ as compared
to a photon field.
✔✔55Gy - ✔✔What is the ideal dose limit to 0.03cc of the brainstem?
✔✔Depth, FS, E - ✔✔TMR are dependent on what?
✔✔Dscatter/Dair under SAD conditions - ✔✔SAR is defined by
✔✔the pelvic sidewall/obturator nodes - ✔✔The location of point B in a T&O procedure
is
✔✔(273.2 + T / 295)(760/P) - ✔✔Temp/Press correction formula
✔✔slightly greater - ✔✔The surface dose for a proton field is _______ as compared to
a photon field.
✔✔Linac QA - ✔✔TG142 is a document that gives recommendations on what?
✔✔Prostate - ✔✔Cs-131 is mostly common used in brachytherapy for which kind of
treatment?
✔✔1 - ✔✔The QF for electron is:
✔✔a portion of the target is not covered by the RX dose - ✔✔A Conformity Index of
<1.0 means what?
✔✔Brainstem - ✔✔Which of the following would be considered a serial structure?
Parotid gland, Brainstem, Heart, Lung
✔✔Savi - ✔✔Which partial breast irradiation device contains the most catheters?
✔✔C3 - ✔✔The hyoid bone is located at what vertebral level?
✔✔1.1 - ✔✔What is the RBE for protons?
, ✔✔50Gy - ✔✔A pt is being tx'd for esophageal ca. The max dose limit to 0.03cc of the
small bowel should not exceed what dose?
✔✔flattening filter - ✔✔The primary collimator within a linac is located bepfre the:
✔✔2mm or 1% on a side - ✔✔QA tolerances for mechanical / light field coincidence for
IMRT tx are suggested in TG 142. What are they?
✔✔T1 - ✔✔Gd is used as a contrast agent for what type of imaging?
✔✔divergence and inhomogeniety - ✔✔Superposition is more accurate than
convolution with:
✔✔T4-T5 - ✔✔The carina is located at what vertebral level
✔✔2 mR/hr - ✔✔The exposure rate limit to the general public in a single hour should be
less than
✔✔wavelength - ✔✔An Angstrom is a unit of
✔✔entrance and exit of each field at Dmax level - ✔✔What location would the hotspot
in an AP/PA field arrangement be located?
✔✔Concentration in ROI/(Injected Dose/BodyMass) - ✔✔Standardized uptake values in
PET imaging are defined as:
✔✔Bone, Thyroid, kidney, fat, lung - ✔✔List from highest to lowest the CT numbers of
the tissues: Lung, bone, thyroid, fat kidney
✔✔A=Ao e^-(decay constant)(t) - ✔✔Radioactivity formula
✔✔2% - ✔✔Identify the suggested tolerance value from TG 142 for monthly output
tolerance.
✔✔Leaf positions that are out of calibration - ✔✔MLC QA uses the picket fence test to
detect what?
✔✔L1 - ✔✔The pylorus of the stomach is located at what vertebral level?
✔✔Lungs - ✔✔What is the most common site of metastasis in Ewing's Sarcoma?
✔✔30 MeV - ✔✔In treating ocular lesions with protons, what energy would you use?
ANSWERS MARKED A+
✔✔D2 - ✔✔Maximum total dose in Gy to any point 2cm or greater away from the PTV in
any direction
✔✔V12<5-10cc - ✔✔Brain volume SRS 1 fx
✔✔2mm; 1 degree - ✔✔TG-142 suggests monthly QA tolerances for lateral,
longitudinal, and rotational couch positions for IMRT to be
✔✔2mm, 1% on a side - ✔✔TG-142 suggests monthly QA tolerances for
mechanical/light field coincidence for IMRT to be
✔✔2% - ✔✔TG-142 suggests monthly QA tolerances for electron output constancy for
IMRT to be
✔✔R50 - ✔✔the ratio of the volume of 50% of the prescription dose isodose to the
volume of the PTV
✔✔2mm - ✔✔TG-40 suggests daily QA tolerances for laser localization for simulators to
be
✔✔2mm - ✔✔TG-40 suggests annual QA for medical accelerator tolerances for gantry
rotation isocenter to be
✔✔<32% - ✔✔Kidney V20
✔✔E, FS, d, SSD - ✔✔PDD is dependent on
✔✔E, FS, d - ✔✔TMR is dependent on
✔✔3.7 x 10^10 Bq - ✔✔1 Ci =? Bq
✔✔10^6 - ✔✔mega (M)
✔✔alpha particle, 1MV, 250kVp, Co-60 - ✔✔Rank LET from highest to lowest: 1MV,
alpha particle, 250kVp, Co-60
✔✔1mSv - ✔✔100mrad = ? dose equivalent
✔✔<12 Gy - ✔✔Optic Nerve/Chiasm SRS 1 fx Dmax
,✔✔target, Primary collimator, flattening filter, dose chambers, secondary collimator -
✔✔What is the correct order of components in treatment head to generate x-rays?
✔✔6Mv - ✔✔Which linac energy requires the highest beam current
✔✔Leukemia - ✔✔Which is considered a stochastic effect?
Cataracts, Erythema, Sterility, Leukemia
✔✔Slightly greater - ✔✔The lateral penumbra of a proton field is ______ as compared
to a photon field.
✔✔55Gy - ✔✔What is the ideal dose limit to 0.03cc of the brainstem?
✔✔Depth, FS, E - ✔✔TMR are dependent on what?
✔✔Dscatter/Dair under SAD conditions - ✔✔SAR is defined by
✔✔the pelvic sidewall/obturator nodes - ✔✔The location of point B in a T&O procedure
is
✔✔(273.2 + T / 295)(760/P) - ✔✔Temp/Press correction formula
✔✔slightly greater - ✔✔The surface dose for a proton field is _______ as compared to
a photon field.
✔✔Linac QA - ✔✔TG142 is a document that gives recommendations on what?
✔✔Prostate - ✔✔Cs-131 is mostly common used in brachytherapy for which kind of
treatment?
✔✔1 - ✔✔The QF for electron is:
✔✔a portion of the target is not covered by the RX dose - ✔✔A Conformity Index of
<1.0 means what?
✔✔Brainstem - ✔✔Which of the following would be considered a serial structure?
Parotid gland, Brainstem, Heart, Lung
✔✔Savi - ✔✔Which partial breast irradiation device contains the most catheters?
✔✔C3 - ✔✔The hyoid bone is located at what vertebral level?
✔✔1.1 - ✔✔What is the RBE for protons?
, ✔✔50Gy - ✔✔A pt is being tx'd for esophageal ca. The max dose limit to 0.03cc of the
small bowel should not exceed what dose?
✔✔flattening filter - ✔✔The primary collimator within a linac is located bepfre the:
✔✔2mm or 1% on a side - ✔✔QA tolerances for mechanical / light field coincidence for
IMRT tx are suggested in TG 142. What are they?
✔✔T1 - ✔✔Gd is used as a contrast agent for what type of imaging?
✔✔divergence and inhomogeniety - ✔✔Superposition is more accurate than
convolution with:
✔✔T4-T5 - ✔✔The carina is located at what vertebral level
✔✔2 mR/hr - ✔✔The exposure rate limit to the general public in a single hour should be
less than
✔✔wavelength - ✔✔An Angstrom is a unit of
✔✔entrance and exit of each field at Dmax level - ✔✔What location would the hotspot
in an AP/PA field arrangement be located?
✔✔Concentration in ROI/(Injected Dose/BodyMass) - ✔✔Standardized uptake values in
PET imaging are defined as:
✔✔Bone, Thyroid, kidney, fat, lung - ✔✔List from highest to lowest the CT numbers of
the tissues: Lung, bone, thyroid, fat kidney
✔✔A=Ao e^-(decay constant)(t) - ✔✔Radioactivity formula
✔✔2% - ✔✔Identify the suggested tolerance value from TG 142 for monthly output
tolerance.
✔✔Leaf positions that are out of calibration - ✔✔MLC QA uses the picket fence test to
detect what?
✔✔L1 - ✔✔The pylorus of the stomach is located at what vertebral level?
✔✔Lungs - ✔✔What is the most common site of metastasis in Ewing's Sarcoma?
✔✔30 MeV - ✔✔In treating ocular lesions with protons, what energy would you use?
