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MDCB PRACTICE QUESTIONS NEED EXTRA REVIEW QUESTIONS & ANSWERS RATED A+
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MDCB PRACTICE QUESTIONS NEED EXTRA REVIEW QUESTIONS & ANSWERS RATED A+
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MDCB PRACTICEQUESTIONS NEED
EXTRA REVIEW
QUESTIONS &
ANSWERS RATED A+
MDCB
Evatee 9/5/24 MDCB
,MDCB PRACTICE QUESTIONS NEED EXTRA
REVIEW QUESTIONS & ANSWERS RATED A+
A patient is to receive 55 Gy to a tumor in the mediastinum. In order to meet
the acceptable dose limits for the spinal cord, you could:
a. use high energy photon beams to decrease the entrance dose.
b. block the spinal cord out of all treatment fields after 40 Gy is delivered.
c. use a BID treatment technique to achieve greater repair time for the normal
tissue cells.
d. utilize a 3DCRT beam arrangement including oblique beam angles. Answer -
d. utilize a 3DCRT beam arrangement including oblique beam angles.
Which of the following statements are true for Iodine-125?
a. half-life 86.4 days.
b. has life-long radiation protection issues.
c. energy of 0.412 MeV.
d. decays exclusively by electron capture. Answer - d. decays exclusively by
electron capture.
The most significant effect(s) of an air cavity in a megavoltage beam treatment
is:
a. a change in the spectral energy distribution within the cavity.
b. an increased primary photon transmission through the cavity.
c. an enhanced absorption of dose in and beyond the cavity.
, d. a partial gain of electronic equilibrium at the cavity interface. Answer - b. an
increased primary photon transmission through the cavity.
For patients with limited life expectancy the common dose fractionation for
cord compression is:
a. 800cGy in 1 fraction.
b. 2000cGy in 5 fractions.
c. 3000cGy in 10 fractions.
d. 3750cGy in 15 fractions. Answer - a. 800cGy in 1 fraction.
Mayneord F factor corrects PDD for:
a. heterogeneity.
b. scatter.
c. Inverse square.
d. exponential attenuation. Answer - b. Inverse square- does not correct for
scatter
For quality assurance of brachytherapy treatment planning computers, the
dose rates should agree with published data tables to which of the following
degrees?
a. +- 1%
b. +- 2%
c. +- 3%
d. +- 5% Answer - b. +- 2%
The expected accuracy of treatment planning systems that perform
brachytherapy dose calculations should be within: a. +/- 3%
b. +/- 5%
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