QUESTIONS AND VERIFIED ANSWERS|NEWEST
Question 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
CORRECT ANSWER
At some distance from the skin surface
Question 2
All of the following are signs of ovarian cancer except:
a. vaginal bleeding
b. abdominal bloating
c. constipation
d. nausea
CORRECT ANSWER
Vaginal bleeding
Question 3
1
@THE STUDY VAULT
,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
CORRECT 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.
Question 4
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
CORRECT ANSWER
0.25 cGy/MU
Inverse Square Formula
Question 5
2
@THE STUDY VAULT
, 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
CORRECT ANSWER
17.5 x 21.9
Use direct proportion
Question 6
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
CORRECT 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
Question 7
3
@THE STUDY VAULT
Question 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
CORRECT ANSWER
At some distance from the skin surface
Question 2
All of the following are signs of ovarian cancer except:
a. vaginal bleeding
b. abdominal bloating
c. constipation
d. nausea
CORRECT ANSWER
Vaginal bleeding
Question 3
1
@THE STUDY VAULT
,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
CORRECT 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.
Question 4
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
CORRECT ANSWER
0.25 cGy/MU
Inverse Square Formula
Question 5
2
@THE STUDY VAULT
, 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
CORRECT ANSWER
17.5 x 21.9
Use direct proportion
Question 6
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
CORRECT 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
Question 7
3
@THE STUDY VAULT
