MDCB Practice Set 4 - Test 14 2025-
2026
D - answer1. In which of the following sites is respiratory gating not necessary?
(A) lung
(B) breast
(C) liver
(D) nasopharynx
D - answer2. In the simulation/localization process of the prostate, the purpose of the
retrograde urethrogram is to define the:
(A) base of the prostate.
(B) location of the penis.
(C) volume of the prostate.
(D) apex of the prostate.
A - answer3. The volume of the prostate on pathological evaluation closely correlates to
the volume defined by which of the following?
(A) magnetic resonance imaging
(B) retrograde urethrography
(C) PET scan
(D) computerized tomography scans
D - answer4. Adaptive radiation therapy is best described as a(n):
(A) approach to conform high dose to the target volume and minimize dose to sensitive
structures.
(B) precise form of radiation therapy used to treat intracranial tumors.
(C) technique where the radiation beams are shaped to match the tumor.
(D) process where the treatment plan can be modified, depending on changes in the
geometry
of the tumor and/or patient.
C - answer5. When CT is compared to MRI, which of the following is frequently true
regarding the volume of the prostate gland and surrounding anatomy?
(A) The CT and MRI volumes will appear the same.
(B) The CT volumes will appear smaller.
(C) The CT volumes will appear larger.
(D) The CT volumes are more likely to contain distortion.
B - answer6.
The change in tumor shape in the associated figures is due to:
(A) different slice thickness for CT.
, (B) tumor motion.
(C) patient positioning.
(D) cardiac cycling.
B - answer7. From the RTOG Breast Cancer Atlas for Radiation Therapy Planning,
breast contouring for an
intact breast includes which of the following?
(A) Breast Clinical Target Volume (CTV) includes tissue that crosses midline.
(B) Gross Target Volume (GTV) includes the seroma and surgical clips.
(C) Breast Clinical Target Volume (CTV) includes the seroma only.
(D) Breast Clinical Target Volume (CTV) includes the apparent glandular breast tissue
and
lymph nodes.
A - answer8. In Intensity Modulated Radiation Therapy (IMRT), the smallest beam
element is called a:
(A) beamlet.
(C) voxel.
(D) pixel.
(E) spot.
D - answer9. Which of the following treatment techniques is likely to be associated with
the greatest integral
dose to normal tissue?
(A) single direct portal
(B) 2 opposed portals
(C) 4-field 3-dimensional conformal
(D) 8-field Intensity Modulated Radiation Therapy (IMRT)
C - answer10. The surface dose for 6 MeV electron beam, based on a 10x10 cm2
field size, is:
(A) 70%.
(B) 80%.
(C) 90%.
(D) 100%
A - answer11. When a missing tissue compensator is used in the treatment of the
thorax, it will:
(A) reduce the variation of dose within the field.
(B) reduce the treatment time.
(C) produce increased phantom scatter.
(D) necessitate a change in dose fractionation.
C - answer12. Intensity Modulated Radiation Therapy (IMRT) differs from conformal
radiation therapy in that
IMRT planning uses:
2026
D - answer1. In which of the following sites is respiratory gating not necessary?
(A) lung
(B) breast
(C) liver
(D) nasopharynx
D - answer2. In the simulation/localization process of the prostate, the purpose of the
retrograde urethrogram is to define the:
(A) base of the prostate.
(B) location of the penis.
(C) volume of the prostate.
(D) apex of the prostate.
A - answer3. The volume of the prostate on pathological evaluation closely correlates to
the volume defined by which of the following?
(A) magnetic resonance imaging
(B) retrograde urethrography
(C) PET scan
(D) computerized tomography scans
D - answer4. Adaptive radiation therapy is best described as a(n):
(A) approach to conform high dose to the target volume and minimize dose to sensitive
structures.
(B) precise form of radiation therapy used to treat intracranial tumors.
(C) technique where the radiation beams are shaped to match the tumor.
(D) process where the treatment plan can be modified, depending on changes in the
geometry
of the tumor and/or patient.
C - answer5. When CT is compared to MRI, which of the following is frequently true
regarding the volume of the prostate gland and surrounding anatomy?
(A) The CT and MRI volumes will appear the same.
(B) The CT volumes will appear smaller.
(C) The CT volumes will appear larger.
(D) The CT volumes are more likely to contain distortion.
B - answer6.
The change in tumor shape in the associated figures is due to:
(A) different slice thickness for CT.
, (B) tumor motion.
(C) patient positioning.
(D) cardiac cycling.
B - answer7. From the RTOG Breast Cancer Atlas for Radiation Therapy Planning,
breast contouring for an
intact breast includes which of the following?
(A) Breast Clinical Target Volume (CTV) includes tissue that crosses midline.
(B) Gross Target Volume (GTV) includes the seroma and surgical clips.
(C) Breast Clinical Target Volume (CTV) includes the seroma only.
(D) Breast Clinical Target Volume (CTV) includes the apparent glandular breast tissue
and
lymph nodes.
A - answer8. In Intensity Modulated Radiation Therapy (IMRT), the smallest beam
element is called a:
(A) beamlet.
(C) voxel.
(D) pixel.
(E) spot.
D - answer9. Which of the following treatment techniques is likely to be associated with
the greatest integral
dose to normal tissue?
(A) single direct portal
(B) 2 opposed portals
(C) 4-field 3-dimensional conformal
(D) 8-field Intensity Modulated Radiation Therapy (IMRT)
C - answer10. The surface dose for 6 MeV electron beam, based on a 10x10 cm2
field size, is:
(A) 70%.
(B) 80%.
(C) 90%.
(D) 100%
A - answer11. When a missing tissue compensator is used in the treatment of the
thorax, it will:
(A) reduce the variation of dose within the field.
(B) reduce the treatment time.
(C) produce increased phantom scatter.
(D) necessitate a change in dose fractionation.
C - answer12. Intensity Modulated Radiation Therapy (IMRT) differs from conformal
radiation therapy in that
IMRT planning uses:
