MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED
GUIDE.
The energy equivalent of an atomic mass unit is:
(A) 0.5 MeV.
(B) 1.0 MeV.
(C) 931.0 MeV.
(D) 1000.0 keV.
(C) 931.0 MeV.
Which of the following describe(s) the Becquerel (Bq)?
(A) 3.7 x 108 mCi
(B) 3.7 x 1010 mCi
(C) 2.7 x 10-8mCi
(D) 2.7 x 10-10mCi
(C) 2.7 x 10-8mCi
The best way to reduce dose to a patient's right optic nerve while treating a right lacrimal gland tumor
with non-coplanar 6 MV photons is to instruct the patient to:
(A) look laterally.
(B) look medially.
(C) look straight ahead.
(D) close the eyes.
(A) look laterally.
Devices used to measure respiratory motion for radiation therapy planning include:
(A) spectrometer.
(B) spirometer.
(C) oximeter.
(D) odometer.
(B) spirometer.
A brain tumor target volume is indicated by the radiation oncologist on several transverse CT scans
from a pre-operative diagnostic study. For treatment planning purposes, the most reliable method for
establishing a target volume would be to:
(A) Request a treatment planning CT scan through this region.
(B) Have the radiation oncologist indicate the target volume on the CT scout scan.
(C) Transfer these volumes to the orthogonal radiographs by relating them to bony landmarks.
(D) Verify the magnification factor of the CT scans.
(A) Request a treatment planning CT scan through this region.
Which of the following immobilizer(s) are best suited for conformal treatment of patients with head
and neck tumors?
, (A) thermoplastic casting material and head rest
(B) Timo headrest with three-point laser setup
(C) thermoplastic casting material and head sponge
(D) tape and three-point laser setup
(A) thermoplastic casting material and head rest
32. How is a random error as defined in radiation oncology?
(A) It is the difference between the measured and the actual fluence maps for an IMRT plan.
(B) It is the variation in individual treatment setup on a daily basis.
(C) It is the measured difference between Monte Carlo and a model based algorithm.
(D) It is the variation in the translation of treatment setup from simulator to the treatment unit.
(B) It is the variation in individual treatment setup on a daily basis.
When simulating a tumor of the esophagus, the patient may be placed in the prone position to:
(A) straighten the curvature of the spine.
(B) increase the distance between the spine and esophagus.
(C) decrease the amount of lung in the oblique fields.
(D) increase the reproducibility of the setup.
(B) increase the distance between the spine and esophagus.
Errors in CT based treatment planning may result when:
(A) a flat couch is used for treatment planning CT scans.
(B) treatment planning CT scans are obtained in the treatment position.
(C) pre-operative CT scans are used .
(D) the CT slice thickness is less than 0.2 cm.
(C) pre-operative CT scans are used .
Which instrument would be the most appropriate choice for monitoring radiation leakage from a
Cobalt-60 source (with the source in the off position)?
(A) Geiger-Muller counter
(B) cylindrical type ionization chamber (0.6cc)
(C) survey meter type ionization chamber
(D) radiotherapy verification film
(D) radiotherapy verification film
Examples of radiation-induced, chronic skin changes do NOT include:
(A) fibrosis.
(B) moist desquamation.
(C) telangiectasis.
(D) ulceration.
(B) moist desquamation.
Disadvantage(s) of current electronic portal imaging, when compared to radiographic port films,
include which of the following?
GUIDE.
The energy equivalent of an atomic mass unit is:
(A) 0.5 MeV.
(B) 1.0 MeV.
(C) 931.0 MeV.
(D) 1000.0 keV.
(C) 931.0 MeV.
Which of the following describe(s) the Becquerel (Bq)?
(A) 3.7 x 108 mCi
(B) 3.7 x 1010 mCi
(C) 2.7 x 10-8mCi
(D) 2.7 x 10-10mCi
(C) 2.7 x 10-8mCi
The best way to reduce dose to a patient's right optic nerve while treating a right lacrimal gland tumor
with non-coplanar 6 MV photons is to instruct the patient to:
(A) look laterally.
(B) look medially.
(C) look straight ahead.
(D) close the eyes.
(A) look laterally.
Devices used to measure respiratory motion for radiation therapy planning include:
(A) spectrometer.
(B) spirometer.
(C) oximeter.
(D) odometer.
(B) spirometer.
A brain tumor target volume is indicated by the radiation oncologist on several transverse CT scans
from a pre-operative diagnostic study. For treatment planning purposes, the most reliable method for
establishing a target volume would be to:
(A) Request a treatment planning CT scan through this region.
(B) Have the radiation oncologist indicate the target volume on the CT scout scan.
(C) Transfer these volumes to the orthogonal radiographs by relating them to bony landmarks.
(D) Verify the magnification factor of the CT scans.
(A) Request a treatment planning CT scan through this region.
Which of the following immobilizer(s) are best suited for conformal treatment of patients with head
and neck tumors?
, (A) thermoplastic casting material and head rest
(B) Timo headrest with three-point laser setup
(C) thermoplastic casting material and head sponge
(D) tape and three-point laser setup
(A) thermoplastic casting material and head rest
32. How is a random error as defined in radiation oncology?
(A) It is the difference between the measured and the actual fluence maps for an IMRT plan.
(B) It is the variation in individual treatment setup on a daily basis.
(C) It is the measured difference between Monte Carlo and a model based algorithm.
(D) It is the variation in the translation of treatment setup from simulator to the treatment unit.
(B) It is the variation in individual treatment setup on a daily basis.
When simulating a tumor of the esophagus, the patient may be placed in the prone position to:
(A) straighten the curvature of the spine.
(B) increase the distance between the spine and esophagus.
(C) decrease the amount of lung in the oblique fields.
(D) increase the reproducibility of the setup.
(B) increase the distance between the spine and esophagus.
Errors in CT based treatment planning may result when:
(A) a flat couch is used for treatment planning CT scans.
(B) treatment planning CT scans are obtained in the treatment position.
(C) pre-operative CT scans are used .
(D) the CT slice thickness is less than 0.2 cm.
(C) pre-operative CT scans are used .
Which instrument would be the most appropriate choice for monitoring radiation leakage from a
Cobalt-60 source (with the source in the off position)?
(A) Geiger-Muller counter
(B) cylindrical type ionization chamber (0.6cc)
(C) survey meter type ionization chamber
(D) radiotherapy verification film
(D) radiotherapy verification film
Examples of radiation-induced, chronic skin changes do NOT include:
(A) fibrosis.
(B) moist desquamation.
(C) telangiectasis.
(D) ulceration.
(B) moist desquamation.
Disadvantage(s) of current electronic portal imaging, when compared to radiographic port films,
include which of the following?
