*MDCB: Mock Exam 2 Questions With Complete Answers
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Module
MDCB
Institution
MDCB
A patient receiving treatment to the head and neck region has experienced a skin reaction and mucositis at a total dose much lower than anticipated. The radiation oncologist requests an evaluation of the treatment. Which of the following steps should be taken?
A. recalculate the treatment plan
...
*MDCB: Mock Exam 2 Questions With
Complete Answers
A patient receiving treatment to the head and neck region has experienced a skin reaction and
mucositis at a total dose much lower than anticipated. The radiation oncologist requests an
evaluation of the treatment. Which of the following steps should be taken?
A. recalculate the treatment plan
B. ensure that the depth dose, build-up region, wedge parameters, and other pertinent
information for the treatment unit are correct
C. review the treatment setup with the therapist
D. recalculate the monitor unit settings
E. all are correct - ANS E
For megavoltage dosimetry, TLD can provide accuracy of:
A. plus/minus 20%
B. plus/minus 10%
C. plus/minus 3%
D. plus/minus 1% - ANS C
With megavoltage film dosimetry, isodose curves can be measured to within:
A. plus/minus 10%
B. plus/minus 7%
C. plus/minus 3%
D. plus/minus 1% - ANS C
In megavoltage therapy, typical use(s) of diodes is for:
,A. patient dosimetry
B. beam scanning
C. quality assurance
D. all of the answers are correct - ANS D
Which of the following is best suited for calibration of a megavoltage beam:
A. diode detector
B. thermoluminescence dosimetry
C. film
D. ionization chamber - ANS D
The f-factor:
A. is the roentgen to cGy conversion factor
B. is greatest for high Z materials and low energy photons
C. is 0.873 in air
D. all of the answers are correct
E. none of the answers are correct - ANS D
Clinical application of MLC include which of the following?
A. shaping of electron fields as a replacement for cerrobend blocks
B. dynamic field shaping as a function of patient respiration
C. field shaping without penumbra
D. modulating beam intensity - ANS D
The 104% isodose lines at the four corners of the target shown are due to the:
A. inhomogeneity of the femur
,B. scatter from the femur
C. horns of the beams
D. weights of the lateral beams
E. use of a wrong algorithm - ANS C
Exposure is:
A. the amount of energy in Joules/kg transferred from a photon beam to a material
B. only defined for photons and charged particles below 3 MeV
C. the charge liberated by photons in a given mass of air
D. the absorbed dose multiplied by the quality factor
E. None of the answers - ANS C
The quantity that an ionization chamber actually measures is:
A. roentgen
B. gray
C. charge
D. kerma
E. voltage - ANS C
Geiger counters:
A. are sensitive enough to detect individual photons or particles
B. are less sensitive than ionization chambers
C. are used to calibrate linac output
D. operate on the principle of scintillation - ANS A
Which of the following is an advantage of using an MRI for treatment planning?
, A. there is no patient anatomy distortion on the images
B. it is reliable for locating tumors within tissue
C. it always displays an accurate external patient contour
D. the brightness of the image is directly related to tissue density - ANS B
Based on clinical experiences with TBI before bone marrow transplantation and hemibody
irradiation, the most important dose-limiting tissue is the:
A. lens of the eye
B. spinal cord
C. lung
D. skin
E. liver - ANS C
Dose volume histograms are useful to:
A. identify the location of the global dose maximum in the volume treated
B. optimize the radiation treatment in a reasonable time
C. display location of uniform dose, low dose or high dose within a structure
D. provide a graphic display of dose to the target
E. all are correct - ANS D
OER for photon or electron therapy is:
A. 1
B. 2.5 to 3
C. 10
D. none of the answers are correct - ANS B
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