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MDCB Practice Questions With 100% Verified Correct Answers

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MDCB Practice Questions With 100% Verified Correct Answers 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...

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  • September 7, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
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MDCB Practice Questions With 100% Verified
Correct Answers
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. - Correct 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. - Correct 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. - Correct 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. - Correct Answer a. 800cGy in 1 fraction.



Mayneord F factor corrects PDD for:

a. heterogeneity.

b. scatter.

, c. Inverse square.

d. exponential attenuation. - Correct 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% - Correct Answer b. +- 2%



The expected accuracy of treatment planning systems that perform brachytherapy dose calculations
should be within: a. +/- 3%

b. +/- 5%

c. +/- 7%

d. +/- 10% - Correct Answer b. +/- 5%



With LINAC based SBRT/SABR and a plan that has a 100% maximum IDL, what is the typical range of
prescription isodose line covering the PTV?

a. 40 - 60 %

b. 60 - 90 %

c. 90 - 100 %

d. > 100 % - Correct Answer c. 90 - 100 %



The ratio of the dose rate of a given field size to the dose rate of the reference field size is:

a. Relative output factor

b. Back scatter factor

c. Percent depth dose

d. Tissue maximum ratio - Correct Answer A. Relative output factor



During which stage of mitosis do the chromosomes align across the equator of the spindle fibers?

a. prophase

b. metaphase

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