MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED
GUIDE.
A
What is the approximate density of healthy lung tissue?
A. 0.30 g/cc
B. 0.95 g/cc
C. 1.00 g/cc
D. 1.03 g/cc
B
2. The accelerator component that injects electrons into the linear accelerator is:
A. a klystron.
B. an electron gun.
C. a bending magnet.
D. a thyratron.
D
The equivalent square of a rectangular field of dimensions X xY is:
A. The square root of 4 x X x Y
B. 2 x (X x Y)
C. (4 x X x Y) / (X + Y)
D. 2 x (X x Y) / (X + Y)
D
Which of the following problems may be encountered in the use of diagnostic CT data in radiation
therapy treatment planning?
(1) Vertical & horizontal scales may differ, resulting in image distortion.
(2) Small scan ring size may result in side cut-off of patient contours
(3) The position of the patient in the scanner may not duplicate the therapy setup.
(4) Cross-sectional CT images can provide inaccurate tissue heterogeneity correctios if the data do not
correlate with the CT tables in the treatment planning computer.
A. 1, 2, and 3 only are correct
B. 1 and 3 only are correct
C. 2 and 4 only are correct
D. All are correct
B
3. Radiation damage to the fetus resulting in severe birth defects would most often occur when
radiation was delivered at which time post-fertilization?
A. 0 - 2 weeks
B. 3 - 12 weeks
GUIDE.
A
What is the approximate density of healthy lung tissue?
A. 0.30 g/cc
B. 0.95 g/cc
C. 1.00 g/cc
D. 1.03 g/cc
B
2. The accelerator component that injects electrons into the linear accelerator is:
A. a klystron.
B. an electron gun.
C. a bending magnet.
D. a thyratron.
D
The equivalent square of a rectangular field of dimensions X xY is:
A. The square root of 4 x X x Y
B. 2 x (X x Y)
C. (4 x X x Y) / (X + Y)
D. 2 x (X x Y) / (X + Y)
D
Which of the following problems may be encountered in the use of diagnostic CT data in radiation
therapy treatment planning?
(1) Vertical & horizontal scales may differ, resulting in image distortion.
(2) Small scan ring size may result in side cut-off of patient contours
(3) The position of the patient in the scanner may not duplicate the therapy setup.
(4) Cross-sectional CT images can provide inaccurate tissue heterogeneity correctios if the data do not
correlate with the CT tables in the treatment planning computer.
A. 1, 2, and 3 only are correct
B. 1 and 3 only are correct
C. 2 and 4 only are correct
D. All are correct
B
3. Radiation damage to the fetus resulting in severe birth defects would most often occur when
radiation was delivered at which time post-fertilization?
A. 0 - 2 weeks
B. 3 - 12 weeks
