RADIATION THERAPY BOARD REVIEW
EXAM 2025 QUESTIONS AND ANSWERS
Prophylactic cranial irradiation for ALL is administered to a total dose of:
A. 1200 cGy
B. 1800 cGy
C. 3000 cGy
D. 4500 cGy
E. 6000 cGy - ANS B. 1800 cGy
The treatment time for a field requiring 350 monitor units while the linear acellerator dose rate
is 220 units/minute is:
A. .394 minutes
B. .629 minutes
C. 1.59 minutes
D. 2.52 minutes - ANS C. 1.59 minutes
Placing marks on the central axis only is:
A. Sufficient for daily realignment and targeting
B. Sufficient when target margins are small
C. Adequate for treating small fields
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,D. Insufficient for daily realignment and targeting - ANS D. Insufficient for daily realignment
and targeting
*Marks should be placed on the central axis and along coordinate planes to assure the patient
and location target is accurately reproduced.
During total CNS irradiation, the patient is:
A. Supine with an extended chin
B. Supine with chin flexed
C. Prone with chin slightly extended
D. Prone with chin flexed - ANS C. Prone with chin slightly extended
Electron contamination from high energy photon beams may result from photon interactions
with the:
A. Room air
B. Collimators
C. Bolus
D. Lucite trays - ANS B. Collimators
Lucite is often used as the material for positioning devices. One major concern when this
material is in the path of the treatment beam is:
A. Electron contamination
B. Beam attenuation
C. Decreased rigidity
D. Acquired radioactivity - ANS B. Beam attenuation
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,Advantages of networked digital image management do not include:
A. Dispersed access to images
B. Multiple users can share images
C. Physical storage space is minimized
D. Computer disk space is not an issue - ANS D. Computer disk space is not an issue
In the treatment of seminoma, an external testicular shield should be used for the remaining
testicle. This is Important since the TD 5/5 for the testis is as low as:
A. 1 Gy
B. 10 Gy
C. 20 Gy
D. 40 Gy - ANS A. 1 Gy
Which of the following cannot produce a 3 dimensional image?
A. MRI
B. CT
C. Ultrasound
D. Electronic portal imaging - ANS D. Electronic portal imaging
A procedure in which an implant is made using a trocar, with radioactive sources introduced
into the trocar and then the trocar is removed is called:
A. Self-attenuation
B. Interstitial preloading
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, C. Intracavitary microloading
D. Interstitial afterloading - ANS D. Interstitial afterloading
The precise daily reproduction of patient position depends on:
1. Patient age
2. Type of treatment machine
3. Anatomical site treated
4. Patients overall health
A. 1 & 2
B. 2 & 3
C. 3 & 4
D. 1 & 4 - ANS C. 3 & 4
The linear scales on the treatment table are used as an aid for:
A. Translation of patient position on the table
B. Verifying filament voltage
C. Verifying gantry readout accuracy
D. Documentation of treatment dose - ANS A. Translation of patient position on the table
Compared to water, the density of bone is:
A. 1.00
B. 1.65-1.85
C. 0.33-0.35
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EXAM 2025 QUESTIONS AND ANSWERS
Prophylactic cranial irradiation for ALL is administered to a total dose of:
A. 1200 cGy
B. 1800 cGy
C. 3000 cGy
D. 4500 cGy
E. 6000 cGy - ANS B. 1800 cGy
The treatment time for a field requiring 350 monitor units while the linear acellerator dose rate
is 220 units/minute is:
A. .394 minutes
B. .629 minutes
C. 1.59 minutes
D. 2.52 minutes - ANS C. 1.59 minutes
Placing marks on the central axis only is:
A. Sufficient for daily realignment and targeting
B. Sufficient when target margins are small
C. Adequate for treating small fields
COPYRIGHT © 2025 THESTAR ALL RIGHTS RESERVED 1
,D. Insufficient for daily realignment and targeting - ANS D. Insufficient for daily realignment
and targeting
*Marks should be placed on the central axis and along coordinate planes to assure the patient
and location target is accurately reproduced.
During total CNS irradiation, the patient is:
A. Supine with an extended chin
B. Supine with chin flexed
C. Prone with chin slightly extended
D. Prone with chin flexed - ANS C. Prone with chin slightly extended
Electron contamination from high energy photon beams may result from photon interactions
with the:
A. Room air
B. Collimators
C. Bolus
D. Lucite trays - ANS B. Collimators
Lucite is often used as the material for positioning devices. One major concern when this
material is in the path of the treatment beam is:
A. Electron contamination
B. Beam attenuation
C. Decreased rigidity
D. Acquired radioactivity - ANS B. Beam attenuation
COPYRIGHT © 2025 THESTAR ALL RIGHTS RESERVED 2
,Advantages of networked digital image management do not include:
A. Dispersed access to images
B. Multiple users can share images
C. Physical storage space is minimized
D. Computer disk space is not an issue - ANS D. Computer disk space is not an issue
In the treatment of seminoma, an external testicular shield should be used for the remaining
testicle. This is Important since the TD 5/5 for the testis is as low as:
A. 1 Gy
B. 10 Gy
C. 20 Gy
D. 40 Gy - ANS A. 1 Gy
Which of the following cannot produce a 3 dimensional image?
A. MRI
B. CT
C. Ultrasound
D. Electronic portal imaging - ANS D. Electronic portal imaging
A procedure in which an implant is made using a trocar, with radioactive sources introduced
into the trocar and then the trocar is removed is called:
A. Self-attenuation
B. Interstitial preloading
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, C. Intracavitary microloading
D. Interstitial afterloading - ANS D. Interstitial afterloading
The precise daily reproduction of patient position depends on:
1. Patient age
2. Type of treatment machine
3. Anatomical site treated
4. Patients overall health
A. 1 & 2
B. 2 & 3
C. 3 & 4
D. 1 & 4 - ANS C. 3 & 4
The linear scales on the treatment table are used as an aid for:
A. Translation of patient position on the table
B. Verifying filament voltage
C. Verifying gantry readout accuracy
D. Documentation of treatment dose - ANS A. Translation of patient position on the table
Compared to water, the density of bone is:
A. 1.00
B. 1.65-1.85
C. 0.33-0.35
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