MDCB Practice Set 2 - Test 6 - 2026
B - answer1. In what document is the approved "Decision Making Model for Determining
the Scope of Practice
of a Qualified Medical Dosimetrist" found?
A. The Medical Dosimetrist Certification Board Charter
B. The AAMD "Scope of Practice of a Medical Dosimetrist"
C. The American College of Radiation Oncology Statement of Standards
D. American Association of Physicists in Medicine Operating Standards
A - answer2. In four dimensional CT scanning (CT acquisition in the respiratory time
scale), the most common
use would occur in the treatment of which type of tumors?
A. lung
B. prostate
C. mediastinal
D. sarcomas
C - answer3. What is the term that defines radiation intensity at points equidistant
around the source,
normalized to the radiation intensity at a reference distance on the radius bisecting the
source?
A. Convergence Function
B. Kerma Function
C. Anisotropy Function
D. Sievert Function
D - answer4. In the adult population, the least likely CNS tumor would be:
A. Anaplastic astrocystoma
B. Glioblastoma
C. Meningioma
D. Ependymoma
D - answer5. In malignant tumors of the nasopharynx that spread directly to the middle
cranial fossa, what is
the usual route of invasion?
A. Directly through base of skull bone
B. Foramen ovale
C. Foramen lacerum
D. Foramen rotundum
B - answer6. What is the electron energy that will give dose coverage ≥93% of the
prescription dose to a target
, volume that extends from 0.5 cm to 2.5 cm below the skin surface and has an 8 mm
bolus placed on
the skin, while minimizing the dose to an underlying avoidance structure at 4.5 cm from
the skin
surface to <50% of the prescribed dose?
A. 9 MeV
B. 12 MeV
C. 16 MeV
D. 20 MeV
C - answer7. What is output from a magnetron?
A. Electrons
B. X rays
C. Microwaves
D. Magnetism
B - answer8. Physical penumbra width is defined as:
A. Total distance between the maximum dose isodose curves at a specified depth
B. Lateral distance between two specified isodose curves at a specified depth
C. Physical distance between the geometric area of dmax dose at a specified depth
D. Geometric distance between the given transmission dose at a specified depth
D - answer9. Nonlinearity in the range of CT numbers in tissue densities is due to
change in the:
A. mass number of the tissue.
B. attenuation coefficients of the tissue.
C. photoelectric interactions.
D. atomic number of the tissues.
C - answer10. The measured and computer generated isodose curves should agree
within:
A. +/- 3%, 2mm.
B. +/- 2%, 3mm.
C. +/- 2%, 2mm.
D. +/- 3%, 3mm.
C - answer11. Dose variation across the field at a specified depth is referred to as:
A. medial alignment
B. dose profile
C. beam profile
D. lateral alignment
D (6.67/6.57)x800 - answer12. On Monday the Ir-192 HDR source activity is 6.67Ci with
a treatment time of 800 seconds. What
would be the approximate expected treatment time on Wednesday with source strength
of
B - answer1. In what document is the approved "Decision Making Model for Determining
the Scope of Practice
of a Qualified Medical Dosimetrist" found?
A. The Medical Dosimetrist Certification Board Charter
B. The AAMD "Scope of Practice of a Medical Dosimetrist"
C. The American College of Radiation Oncology Statement of Standards
D. American Association of Physicists in Medicine Operating Standards
A - answer2. In four dimensional CT scanning (CT acquisition in the respiratory time
scale), the most common
use would occur in the treatment of which type of tumors?
A. lung
B. prostate
C. mediastinal
D. sarcomas
C - answer3. What is the term that defines radiation intensity at points equidistant
around the source,
normalized to the radiation intensity at a reference distance on the radius bisecting the
source?
A. Convergence Function
B. Kerma Function
C. Anisotropy Function
D. Sievert Function
D - answer4. In the adult population, the least likely CNS tumor would be:
A. Anaplastic astrocystoma
B. Glioblastoma
C. Meningioma
D. Ependymoma
D - answer5. In malignant tumors of the nasopharynx that spread directly to the middle
cranial fossa, what is
the usual route of invasion?
A. Directly through base of skull bone
B. Foramen ovale
C. Foramen lacerum
D. Foramen rotundum
B - answer6. What is the electron energy that will give dose coverage ≥93% of the
prescription dose to a target
, volume that extends from 0.5 cm to 2.5 cm below the skin surface and has an 8 mm
bolus placed on
the skin, while minimizing the dose to an underlying avoidance structure at 4.5 cm from
the skin
surface to <50% of the prescribed dose?
A. 9 MeV
B. 12 MeV
C. 16 MeV
D. 20 MeV
C - answer7. What is output from a magnetron?
A. Electrons
B. X rays
C. Microwaves
D. Magnetism
B - answer8. Physical penumbra width is defined as:
A. Total distance between the maximum dose isodose curves at a specified depth
B. Lateral distance between two specified isodose curves at a specified depth
C. Physical distance between the geometric area of dmax dose at a specified depth
D. Geometric distance between the given transmission dose at a specified depth
D - answer9. Nonlinearity in the range of CT numbers in tissue densities is due to
change in the:
A. mass number of the tissue.
B. attenuation coefficients of the tissue.
C. photoelectric interactions.
D. atomic number of the tissues.
C - answer10. The measured and computer generated isodose curves should agree
within:
A. +/- 3%, 2mm.
B. +/- 2%, 3mm.
C. +/- 2%, 2mm.
D. +/- 3%, 3mm.
C - answer11. Dose variation across the field at a specified depth is referred to as:
A. medial alignment
B. dose profile
C. beam profile
D. lateral alignment
D (6.67/6.57)x800 - answer12. On Monday the Ir-192 HDR source activity is 6.67Ci with
a treatment time of 800 seconds. What
would be the approximate expected treatment time on Wednesday with source strength
of
