What point does NOT define isocenter?
A. The central point in space of gantry rotation
B. The central point in space of collimator rotation
C. The intersection of all the lasers on the treatment room
D. The central point in the tumor mass
Give this one a try later!
D. The central point in the tumor mass
If the output on a machine is 130 rad/min at 80 cm, what is the output at 60 cm?
A. 65 rad/min
B. 232 rad/min
C. 110 rad/min
D. 150 rad/min
,Give this one a try later!
B. 232 rad/min
Use the inverse square law:
SSD 1 = 80 ^ 2 = 6400
SSD 2 = 60 ^ 2 = 3600
I1/I2 = SSD2 ^ 2/SSD 1 ^ 2
130/x = 3600/6400
(6400)(130) = 832,000
832,000/3600(x) = 231.1
Therefore, the answer is 231 rad/min
What is the maximum fractionated dose of radiation delivered to both kidneys in four
weeks that will not induce high blood pressure and renal failure?
A. 2000 cGy
B. 3000 cGy
C. 4000 cGy
D. 5000 cGy
Give this one a try later!
A. 2000 cGy
If a 30 degree wedge is left out of two to five treatments, the central axis dose is:
A. Decreased and the distribution affected
B. Decreased and dose distribution is not affected
,C. Increased and the distribution affected
D. Increased and dose distribution is not affected
Give this one a try later!
C. Increased and the distribution affected
The answer to #25 is:
A. 1
Give this one a try later!
The answer to #25 is:
A. 1
During the course of radiation therapy, patients should ideally be weighed;
A. Daily
B. Weekly
C. Monthly
D. As needed
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B. Weekly
, The pelvic bones will normally contain about ____% of the adult bone marrow.
A. 25%
B. 50%
C. 75%
D. 90%
Give this one a try later!
A. 25%
The normal tissue tolerance doses (NTTD's) are affected by what two factors?
A. Tissue type and surrounding structures
B. Oxygen availability and tissue density
C. The volume irradiated and fraction size
D. Machine energy and tissue location
Give this one a try later!
C. The volume irradiated and fraction size
Which of the following are recommended when discarding needles?
1. Never recap a needle before discarding
2. Break all needles to prevent reclamation from the trash
3. When unsure, consider all needles to be contaminated
A. 1 & 2
B. 1 & 3
A. The central point in space of gantry rotation
B. The central point in space of collimator rotation
C. The intersection of all the lasers on the treatment room
D. The central point in the tumor mass
Give this one a try later!
D. The central point in the tumor mass
If the output on a machine is 130 rad/min at 80 cm, what is the output at 60 cm?
A. 65 rad/min
B. 232 rad/min
C. 110 rad/min
D. 150 rad/min
,Give this one a try later!
B. 232 rad/min
Use the inverse square law:
SSD 1 = 80 ^ 2 = 6400
SSD 2 = 60 ^ 2 = 3600
I1/I2 = SSD2 ^ 2/SSD 1 ^ 2
130/x = 3600/6400
(6400)(130) = 832,000
832,000/3600(x) = 231.1
Therefore, the answer is 231 rad/min
What is the maximum fractionated dose of radiation delivered to both kidneys in four
weeks that will not induce high blood pressure and renal failure?
A. 2000 cGy
B. 3000 cGy
C. 4000 cGy
D. 5000 cGy
Give this one a try later!
A. 2000 cGy
If a 30 degree wedge is left out of two to five treatments, the central axis dose is:
A. Decreased and the distribution affected
B. Decreased and dose distribution is not affected
,C. Increased and the distribution affected
D. Increased and dose distribution is not affected
Give this one a try later!
C. Increased and the distribution affected
The answer to #25 is:
A. 1
Give this one a try later!
The answer to #25 is:
A. 1
During the course of radiation therapy, patients should ideally be weighed;
A. Daily
B. Weekly
C. Monthly
D. As needed
Give this one a try later!
B. Weekly
, The pelvic bones will normally contain about ____% of the adult bone marrow.
A. 25%
B. 50%
C. 75%
D. 90%
Give this one a try later!
A. 25%
The normal tissue tolerance doses (NTTD's) are affected by what two factors?
A. Tissue type and surrounding structures
B. Oxygen availability and tissue density
C. The volume irradiated and fraction size
D. Machine energy and tissue location
Give this one a try later!
C. The volume irradiated and fraction size
Which of the following are recommended when discarding needles?
1. Never recap a needle before discarding
2. Break all needles to prevent reclamation from the trash
3. When unsure, consider all needles to be contaminated
A. 1 & 2
B. 1 & 3
