MDCB Practice Set 5 questions with verified
answers
1. The most radiosensitive phase for mental retardation in the fetus
from RT accidental exposure is:
A. 0-7 weeks.
B. 8-15 weeks.
C. 16-24 weeks.
D. more than 25 weeks. Ans✓✓✓ B
10. According to QUANTEC guidelines, the dose limit to the spinal cord
using conventional fractionation with a 0.2% rate
of myelopathy is:
A. Dmax = 50 Gy Including full cord cross-section
B. Dmax = 45 Gy Including full cord cross-section
C. Dmax = 50 Gy Including partial cord cross-section
D. Dmax = 45 Gy Including partial cord cross-section Ans✓✓✓ A
11. A patient arrives to begin radiotherapy three weeks after the
treatment plan was completed. When it is determined that the patient
has gained considerable weight and there is increased girth over the
treatment area, the CMD should:
A. inform the radiation oncologist that there is an apparent change in
the patient's size and a new treatment plan may be needed.
,B. treat the patient as planned and then notify the radiation oncologist.
C. make arrangements for the patient to see the department's medical
dietician.
D. advise the radiation therapy technologists to monitor the patient for
any adverse effects. Ans✓✓✓ A
12. Presence of which of the following viruses indicates a favorable
prognosis in patients with oropharyngeal cancer?
A. Human papilloma virus
B. Herpes simplex virus
C. Coxsackie virus
D. Epstein Barr virus Ans✓✓✓ A
13. According to AAPM TG Report 142, which of the following tests
should be performed daily on a linear accelerator?
A. constancy factor of energy
B. beam profile constancy
C. optical distance indicator
D. respiratory gating Ans✓✓✓ C
14. A craniospinal patient is setup with conventional photon CSI
simulation. The spine field is setup with an SSD of 100 cm and a field
size of 5x 26 cm. The whole cranium field has a field size of 22 x 18 cm
, at 100 cm SAD. Which of the relationships below correctly reflects the
angle of rotation to be applied to the treatment couch?
A. Tan-1 13/100
B. Tan-1 11/100
C. Tan-1 9/100
D. Tan-1 5/100 Ans✓✓✓ C. Tan^-1 (1/2 brain field length/SAD)
15. Which of the following is a type of computer operating system
sometimes used forradiotherapy planning?
A. DICOM-RT
B. ASCII Code
C. Unix
D. PACS Ans✓✓✓ C
16. ICRU Report #38 and Report #58 both define total reference air
kerma as a method of reporting dose in brachytherapy. Which of the
following descriptors illustrates total reference air kerma (TRAK)?
A. the sum of the reference air kerma and the duration of the
application for each source
B. the product of the reference air kerma and the duration of the
application for each source
C. the sum of the products of the reference air kerma rate and the
duration of the application for each source
answers
1. The most radiosensitive phase for mental retardation in the fetus
from RT accidental exposure is:
A. 0-7 weeks.
B. 8-15 weeks.
C. 16-24 weeks.
D. more than 25 weeks. Ans✓✓✓ B
10. According to QUANTEC guidelines, the dose limit to the spinal cord
using conventional fractionation with a 0.2% rate
of myelopathy is:
A. Dmax = 50 Gy Including full cord cross-section
B. Dmax = 45 Gy Including full cord cross-section
C. Dmax = 50 Gy Including partial cord cross-section
D. Dmax = 45 Gy Including partial cord cross-section Ans✓✓✓ A
11. A patient arrives to begin radiotherapy three weeks after the
treatment plan was completed. When it is determined that the patient
has gained considerable weight and there is increased girth over the
treatment area, the CMD should:
A. inform the radiation oncologist that there is an apparent change in
the patient's size and a new treatment plan may be needed.
,B. treat the patient as planned and then notify the radiation oncologist.
C. make arrangements for the patient to see the department's medical
dietician.
D. advise the radiation therapy technologists to monitor the patient for
any adverse effects. Ans✓✓✓ A
12. Presence of which of the following viruses indicates a favorable
prognosis in patients with oropharyngeal cancer?
A. Human papilloma virus
B. Herpes simplex virus
C. Coxsackie virus
D. Epstein Barr virus Ans✓✓✓ A
13. According to AAPM TG Report 142, which of the following tests
should be performed daily on a linear accelerator?
A. constancy factor of energy
B. beam profile constancy
C. optical distance indicator
D. respiratory gating Ans✓✓✓ C
14. A craniospinal patient is setup with conventional photon CSI
simulation. The spine field is setup with an SSD of 100 cm and a field
size of 5x 26 cm. The whole cranium field has a field size of 22 x 18 cm
, at 100 cm SAD. Which of the relationships below correctly reflects the
angle of rotation to be applied to the treatment couch?
A. Tan-1 13/100
B. Tan-1 11/100
C. Tan-1 9/100
D. Tan-1 5/100 Ans✓✓✓ C. Tan^-1 (1/2 brain field length/SAD)
15. Which of the following is a type of computer operating system
sometimes used forradiotherapy planning?
A. DICOM-RT
B. ASCII Code
C. Unix
D. PACS Ans✓✓✓ C
16. ICRU Report #38 and Report #58 both define total reference air
kerma as a method of reporting dose in brachytherapy. Which of the
following descriptors illustrates total reference air kerma (TRAK)?
A. the sum of the reference air kerma and the duration of the
application for each source
B. the product of the reference air kerma and the duration of the
application for each source
C. the sum of the products of the reference air kerma rate and the
duration of the application for each source
