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Mosby's Radiation Therapy Practice Board Exam 1 questions with correct answers
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Mosby's Radiation Therapy Practice Board Exam 1 questions with correct answers
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Mosby's Radiation Therapy Practice BoardExam 1 questions with correct answers
When a missing tissue compensator is used, it should be placed:
a. directly on the skin surface
b. at some distance from the skin surface
c. on the end of an electron cone
d. on top of a bolus material at iso - Answer At some distance from the skin surface
All of the following are signs of ovarian cancer except:
a. vaginal bleeding
b. abdominal bloating
c. constipation
d. nausea - Answer Vaginal bleeding
While treating a patient with painful boney metastasis, it is desirable to:
a. eliminate clothing in the area of treatment
b. raise clothing so that marks are visualized
c. keep the sheet and blanket under the patient for comfort
d. keep the patient on the gurney to prevent heightened pain - Answer Eliminate clothing in the area of treatment rationale: although it may be more comfortable for patients in pain to have soft clothing and sheets to rest on, it is best practice to remove all clothing and bed dressings in the area of treatment to prevent unnecessary dose build up.
If the cGy/MU is 1.0 at 100 SSD, what is the cGy/MU at 200 cm SSD?
a. 0.25 cGy/MU
b. 2.0 cGy/MU
c. 0.5 cGy/MU
d. 4.0 cGy/MU - Answer 0.25 cGy/MU
Inverse Square Formula
For a field treated with the isocenter at a depth of 12.5 cm on a 100 cm SAD LINAC, the collimator setting is 20 x 25. The field would measure _____ on the patient's skin surface.
a. 20 x 25
b. 7.5 x 12.5
c. 17.5 x 12.9
d. 22.9 x 28.6 - Answer 17.5 x 21.9
Use direct proportion
The eq. square field size must be determined in order to calculate the:
a. dose to be delivered to the central axis b. relative dose values from a reference beam
c. spread of the beam from a certain distance
d. air gap on the patient's external contours - Answer Dose to be delivered to the central axis
Eq. square is necessary to calculate the dose to be delivered to the central axis of a non-square field
If custom blocks need to be used, the shadow tray will _____ the output
a. increase
b. decrease
c. not effect
d. slow - Answer Decrease
Inserting accessories in the path of the beam will attenuate the beam and decrease the output. Transmission factors should be included in dose calculations to compensate for the change in output
Which of the following is true of Beta+ decay?
a. a proton is converted to a neutron
b. a neutron is converted to a proton
c. an electron is captured outside the nucleus and is converted to a proton
d. it requires a transition energy of 0.511 MV - Answer A proton is converted to a
neutron
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