Mosby's Radiation Therapy Practice Board Exam 1 Questions and Answers with complete
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Course
Mosby\'s Radiation Therapy Practice Board
Institution
Mosby\'s Radiation Therapy Practice Board
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 ova...
Mosby's Radiation Therapy Practice Board Exam 1 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 Beta+ decay occurs in nuclides that are neutron deficient. Thus the neutron/proton ratio is increased by converted a proton to a neutron and emitting excess energy in the form of a positron A dose of 300 cGy was to be delivered to the thoracic spine at 95 cm SSD. An error caused treatment to be given at an SSD of 92 cm. The actual dose delivered was: a. 281 b. 291 c. 320 d. 341 - Answer -320 Inverse square law: 300(95/92)^2 Which of the following would be considered a typical alpha/beta ratio for early responding tissue?
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