MDCB Exam Questions With 100%
Verified Answers
Which one of the following dose volume histogram (DVH) results
for a pancreatic treatment plan of conventional fractionation meets
QUANTEC recommended dose tolerances?
A. 75% of the left kidney will receive 30 Gy.
B. 50% of the right kidney will receive 40 Gy.
C. 50% of the liver will receive 42 Gy.
D. 25% of the stomach will receive 45 Gy. -
correct answer ✅D. 25% of the stomach will receive 45 Gy.
An algorithm often used for electron beam dose calculations is:
A. scatter-air ratio (SAR) summations.
B. Batho & Young corrections.
C. Clarkson calculations.
D. pencil beams. -
correct answer ✅D. pencil beams.
Any error in the placement of adjacent fields during radiotherapy
treatment is most likely to:
A. be equally serious for beams of any penumbra.
B. be more serious with beams of smaller penumbra.
C. have no impact the treatment outcome.
,MDCB Exam Questions With 100%
Verified Answers
D. be more serious with beams of larger penumbra. -
correct answer ✅B. be more serious with beams of smaller
penumbra.
A radiation oncology department has a selection of 6, 10, and 18
MV photon beams. For a 7 beam prostate Intensity Modulated
Radiation Therapy (IMRT) plan, it would be appropriate to select
a/an:
A. 6 MV photon beam because it would deliver no neutron dose
and the lowest doses to the tissue outside the planning target
volume (PTV).
B. 6 MV photon beam because it would deliver some neutron dose,
but give the best dose distribution to the PTV.
C. 10 MV photon beam because it would deliver a lower neutron
dose than an 18 MV photon beam and clinically acceptable doses
to the bladder and rectum.
D. 10 MV photon beam because it would deliver no neutron dose
and the lowest doses to the tissue outside the PTV. -
correct answer ✅A. 6 MV photon beam because it would deliver
no neutron dose and the lowest doses to the tissue outside the
planning target volume (PTV).
What can cause increased skin dose in IMRT for prostate cancer?
,MDCB Exam Questions With 100%
Verified Answers
A. prone position
B. wedge under knees- a support device
C. use of high energy photons
D. carbon fiber couch -
correct answer ✅D. carbon fiber couch
Characteristics of multileaf collimators, in current medical LINACs,
include which of the following:
A. accommodates all field sizes.
B. "scalloped" isodose curves in the penumbra region.
C. ability to conform to all possible field shapes.
D. inability to verify leaf shapes. -
correct answer ✅B. "scalloped" isodose curves in the penumbra
region.
The minimum nominal distance a tissue compensator should be
placed from the skin surface without affecting the skin sparing
effect is:
A. 5.0 cm.
B. 10.0 cm.
C. 20.0 cm.
, MDCB Exam Questions With 100%
Verified Answers
D. 25.0 cm. -
correct answer ✅C. 20.0 cm.
When treating with electrons typical X-ray contamination dose to a
patient ranges from approximately:
A. 0.1% to 0.4%
B. 0.5% to 5%
C. 6% to 9%
D. 10% to 12% -
correct answer ✅B. 0.5% to 5%
The most significant factor effecting calculation of dose with tissue
inhomogeneity correction is:
(A) energy of the beam
(B) size of inhomogeneity
(C) depth of inhomogeneity -
correct answer ✅(B) size of inhomogeneity
The five year cure rate for a prostate cancer tumor treated with
primary radiation is:
(A) 5 - 10%
Verified Answers
Which one of the following dose volume histogram (DVH) results
for a pancreatic treatment plan of conventional fractionation meets
QUANTEC recommended dose tolerances?
A. 75% of the left kidney will receive 30 Gy.
B. 50% of the right kidney will receive 40 Gy.
C. 50% of the liver will receive 42 Gy.
D. 25% of the stomach will receive 45 Gy. -
correct answer ✅D. 25% of the stomach will receive 45 Gy.
An algorithm often used for electron beam dose calculations is:
A. scatter-air ratio (SAR) summations.
B. Batho & Young corrections.
C. Clarkson calculations.
D. pencil beams. -
correct answer ✅D. pencil beams.
Any error in the placement of adjacent fields during radiotherapy
treatment is most likely to:
A. be equally serious for beams of any penumbra.
B. be more serious with beams of smaller penumbra.
C. have no impact the treatment outcome.
,MDCB Exam Questions With 100%
Verified Answers
D. be more serious with beams of larger penumbra. -
correct answer ✅B. be more serious with beams of smaller
penumbra.
A radiation oncology department has a selection of 6, 10, and 18
MV photon beams. For a 7 beam prostate Intensity Modulated
Radiation Therapy (IMRT) plan, it would be appropriate to select
a/an:
A. 6 MV photon beam because it would deliver no neutron dose
and the lowest doses to the tissue outside the planning target
volume (PTV).
B. 6 MV photon beam because it would deliver some neutron dose,
but give the best dose distribution to the PTV.
C. 10 MV photon beam because it would deliver a lower neutron
dose than an 18 MV photon beam and clinically acceptable doses
to the bladder and rectum.
D. 10 MV photon beam because it would deliver no neutron dose
and the lowest doses to the tissue outside the PTV. -
correct answer ✅A. 6 MV photon beam because it would deliver
no neutron dose and the lowest doses to the tissue outside the
planning target volume (PTV).
What can cause increased skin dose in IMRT for prostate cancer?
,MDCB Exam Questions With 100%
Verified Answers
A. prone position
B. wedge under knees- a support device
C. use of high energy photons
D. carbon fiber couch -
correct answer ✅D. carbon fiber couch
Characteristics of multileaf collimators, in current medical LINACs,
include which of the following:
A. accommodates all field sizes.
B. "scalloped" isodose curves in the penumbra region.
C. ability to conform to all possible field shapes.
D. inability to verify leaf shapes. -
correct answer ✅B. "scalloped" isodose curves in the penumbra
region.
The minimum nominal distance a tissue compensator should be
placed from the skin surface without affecting the skin sparing
effect is:
A. 5.0 cm.
B. 10.0 cm.
C. 20.0 cm.
, MDCB Exam Questions With 100%
Verified Answers
D. 25.0 cm. -
correct answer ✅C. 20.0 cm.
When treating with electrons typical X-ray contamination dose to a
patient ranges from approximately:
A. 0.1% to 0.4%
B. 0.5% to 5%
C. 6% to 9%
D. 10% to 12% -
correct answer ✅B. 0.5% to 5%
The most significant factor effecting calculation of dose with tissue
inhomogeneity correction is:
(A) energy of the beam
(B) size of inhomogeneity
(C) depth of inhomogeneity -
correct answer ✅(B) size of inhomogeneity
The five year cure rate for a prostate cancer tumor treated with
primary radiation is:
(A) 5 - 10%
