MDCB CERTIFICATION SET 5 |ACTUAL QUESTIONS
AND VERIFIED ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
1. DICOM allows:
A. Imaging modalities and PACS to communicate in the same language.
B. A networked group of computers to manage digital images.
C. X-ray absorber material and a charged coupled device to form an image.
D. Improved image quality in digital portal films.
CORRECT ANSWER
A
Question 2
2. The Planning Target Volume provides margin around the Gross Tumor Volume and/or
Clinical Tumor Volume to
compensate for which of the following?
A. positive margins at tumor bed.
B. inconsistencies in physician drawing.
C. dose fall off.
D. variations in treatment setup.
CORRECT ANSWER
D
Question 3
1
,3. The accuracy of a DVH depends on which of the following?
A. Normal Tissue Complication Probability Value
B. number of OARs assessed
C. Biological Equivalent Dose
D. bin size of histogram
CORRECT ANSWER
D
Question 4
4. Which of the following concepts of 3-dimensional conformal radiotherapy is/are
correctly defined?
A. Differential DVH: Plot of a volume of a structure receiving a certain dose as a function of
dose
B. BEV: display of target and normal tissues parallel to the beam
C. GTV: gross demonstrable extent of tumor
D. PTV: true extent and location of disease
CORRECT ANSWER
C
Question 5
5. Which statement is true about the benefits of PET-CT for use in Radiation Oncology
treatment planning?
A. PET images show chemical or metabolic activity within the body.
B. PET images provide superior anatomical definition over CT images.
C. PET images have an accuracy of 10-15 mm for anatomical location.
D. PET imaging is ideal for diabetic patients.
2
, CORRECT ANSWER
A
Question 6
6. In megavoltage therapy, all beam modifying devices should be placed at least 20.0 cm
from the patient's skin surface
because:
A. the increase in half value layer (HVL) adversely affects skin dose.
B. alpha particles will not reach the skin's surface
C. percentage depth dose (PDD) is increased.
D. secondary electrons are scattered before reaching the patient.
CORRECT ANSWER
D
Question 7
7. When boosting the ethmoid sinus with electrons, where would the hot spot(s) be
expected to occur?
A. along the surface of the irregularity.
B. at the appropriate dmax for that energy.
C. at the bony interface.
D. along the air cavity interface.
CORRECT ANSWER
D
Question 8
3
AND VERIFIED ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
1. DICOM allows:
A. Imaging modalities and PACS to communicate in the same language.
B. A networked group of computers to manage digital images.
C. X-ray absorber material and a charged coupled device to form an image.
D. Improved image quality in digital portal films.
CORRECT ANSWER
A
Question 2
2. The Planning Target Volume provides margin around the Gross Tumor Volume and/or
Clinical Tumor Volume to
compensate for which of the following?
A. positive margins at tumor bed.
B. inconsistencies in physician drawing.
C. dose fall off.
D. variations in treatment setup.
CORRECT ANSWER
D
Question 3
1
,3. The accuracy of a DVH depends on which of the following?
A. Normal Tissue Complication Probability Value
B. number of OARs assessed
C. Biological Equivalent Dose
D. bin size of histogram
CORRECT ANSWER
D
Question 4
4. Which of the following concepts of 3-dimensional conformal radiotherapy is/are
correctly defined?
A. Differential DVH: Plot of a volume of a structure receiving a certain dose as a function of
dose
B. BEV: display of target and normal tissues parallel to the beam
C. GTV: gross demonstrable extent of tumor
D. PTV: true extent and location of disease
CORRECT ANSWER
C
Question 5
5. Which statement is true about the benefits of PET-CT for use in Radiation Oncology
treatment planning?
A. PET images show chemical or metabolic activity within the body.
B. PET images provide superior anatomical definition over CT images.
C. PET images have an accuracy of 10-15 mm for anatomical location.
D. PET imaging is ideal for diabetic patients.
2
, CORRECT ANSWER
A
Question 6
6. In megavoltage therapy, all beam modifying devices should be placed at least 20.0 cm
from the patient's skin surface
because:
A. the increase in half value layer (HVL) adversely affects skin dose.
B. alpha particles will not reach the skin's surface
C. percentage depth dose (PDD) is increased.
D. secondary electrons are scattered before reaching the patient.
CORRECT ANSWER
D
Question 7
7. When boosting the ethmoid sinus with electrons, where would the hot spot(s) be
expected to occur?
A. along the surface of the irregularity.
B. at the appropriate dmax for that energy.
C. at the bony interface.
D. along the air cavity interface.
CORRECT ANSWER
D
Question 8
3
