MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED
GUIDE.
When an enface electron beam is used for chest wall irradiation, which of the following described the
dose at the interface between the chest wall and lung?
A. decreased due to reduced scatter from the lung
B. decreased due to irregular surface contour effects
C. increased due to an increase in the electron fluence
D. increased due to a larger angle of electron scatter
E. unchanged from that in a homogeneous phantom
A
A beam degrader/spoiler is used in a photon beam for TBI in order to:
A. decrease beam energy
B. effectively hold lung transmission blocks close to the patient
C. increase the surface dose to the patient
D. decrease background radiation
E. all are correct
C
A diode dosimeter is:
A. an ionization chamber coated with silicon
B. a vacuum tube
C. a solid state detector
D. Baldwin Farmer chamber
C
Five beam arrangments are shown. Which one would yield the desired plan?
A. arrangement 1
, B. arrangement 2
C. arrangement 3
D. arrangement 4
E. arrangement 5
C
The closest dose limiting critical structure to the pituitary gland is:
A. optic chiasm
B. occipital lobe
C. orbit
D. lens
A
Which of the following modalities is most often used to treat small cell carcinoma?
A. surgery + radiation
B. radiation + chemotherapy
C. chemotherapy + surgery
D. surgery alone
E. radiation alone
B
In High Dose Rate (HDR) brachytherapy, the dose rate at the treatment location is typically:
A. 40 cGy/hr
B. 100 cGy/hr
C. 200 cGy/hr
D. 1000 cGy/hr
GUIDE.
When an enface electron beam is used for chest wall irradiation, which of the following described the
dose at the interface between the chest wall and lung?
A. decreased due to reduced scatter from the lung
B. decreased due to irregular surface contour effects
C. increased due to an increase in the electron fluence
D. increased due to a larger angle of electron scatter
E. unchanged from that in a homogeneous phantom
A
A beam degrader/spoiler is used in a photon beam for TBI in order to:
A. decrease beam energy
B. effectively hold lung transmission blocks close to the patient
C. increase the surface dose to the patient
D. decrease background radiation
E. all are correct
C
A diode dosimeter is:
A. an ionization chamber coated with silicon
B. a vacuum tube
C. a solid state detector
D. Baldwin Farmer chamber
C
Five beam arrangments are shown. Which one would yield the desired plan?
A. arrangement 1
, B. arrangement 2
C. arrangement 3
D. arrangement 4
E. arrangement 5
C
The closest dose limiting critical structure to the pituitary gland is:
A. optic chiasm
B. occipital lobe
C. orbit
D. lens
A
Which of the following modalities is most often used to treat small cell carcinoma?
A. surgery + radiation
B. radiation + chemotherapy
C. chemotherapy + surgery
D. surgery alone
E. radiation alone
B
In High Dose Rate (HDR) brachytherapy, the dose rate at the treatment location is typically:
A. 40 cGy/hr
B. 100 cGy/hr
C. 200 cGy/hr
D. 1000 cGy/hr
