MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED GUIDE.

MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED
GUIDE.
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

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%

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%

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

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

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

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

D