MDCB Practice Test 3 Exam Questions and Answers Radiographs that are generated from CT data in a plane perpendicular to the central axis of a simulated beam of radiation and used as reference images for verification of a computer designed treatment are known as - Correct Answers ✅digitally reconstructed radiographs (DRRs) The tumor type that is most responsive to radiation
treatment is: - Correct Answers ✅seminoma
Thin window parallel-plate chambers are useful for measuring radiation dose in certain circumstances where cylindrical chambers cannot be used. One of the specific circumstances
is for measuring radiation dose at or near: - Correct
Answers ✅the surface The energy loss rate of a 10 MeV electron in water is approximately - Correct Answers ✅2 MeV/cm
Autoradiography of an encapsulated brachytherapy source is:
- Correct Answers ✅a test for gross nonuniformity of the
radionuclide within a source capsule Treatment of inoperable, unresectable, or recurrent malignant salivary gland tumors using fast neutrons compared to the
use of photons result in: - Correct Answers ✅improved
complete response rates for the primary tumor 1 / 2
MDCB Practice Test 3 Exam Questions and Answers For treatment of the prostate by two lateral arcs, an isodose distribution is approved to deliver 180 cGy to the 100% isodose line. The necessary monitor units for each arc field are calculated to be 121. Before the first treatment is delivered, the prescription is changed to deliver 200 cGy to
the 95% line. The new monitor units per lateral arc field are: -
Correct Answers ✅142 In the small volume treatment of bladder cancer with
radiation therapy, the patient should be treated with: -
Correct Answers ✅an empty bladder in order to encompass tumor with reproducibility Although they receive the same dose, some tissues exhibit acute radiation damage earlier than others because they
have a: - Correct Answers ✅higher mitotic index
A 20 cm diameter patient is treated to midplane by using a 100 cm source-to-axis distance (SAD) technique. If the same patient is then treated by using a 100 cm source-to-surface distance (SSD) technique, the monitor units would increase
by approximately: - Correct Answers ✅21%
According to the National Council on Radiation Protection and Measurements (NCRP) (#116) guidelines, the annual effective
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