MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED
GUIDE.
Extra consideration of immobilization for SBRT patients is needed due to:
A. rapid dose falloff.
B. length of treatment time.
C. multiple beams.
D. increased imaging time.
A. rapid dose falloff.
What lead thickness is required to reduce the transmission to less than 5 percent for a 12.5 x 12.5
cm2, with a 12 MeV electron field?
A. 1.2 mm
B. 3.0 mm
C. 5.6 mm
D. 8.0 mm
C. 5.6 mm
Brachytherapy cervix applicators are often made of titanium because it:
A. is a heavier material than plastic.
B. is a very thick shielding material.
C. minimizes the artifacts on CT.
D. allows fractionation of the dose.
C. minimizes the artifacts on CT.
The storage area for radioactive sources containing encapsulated powder or microspheres should be
ventilated by a direct filtered exhaust to the outdoors because of:
A. lead and lead oxide in the room.
B. possible radioactive material leaks from damaged sources.
C. beta contamination from decay products.
D. NCRP recommendations.
B. possible radioactive material leaks from damaged sources.
For quality assurance of brachytherapy treatment planning computers, the dose rates should agree
with published data tables to which of the following degrees?
A. +- 1%
B. +- 2%
C. +- 3%
D. +- 5%
B. +- 2%
The high dose regions or "horns" near the surface in the periphery of the field are caused by:
A. penumbra
, B. flattening filter
C. scattering foil
D. field asymmetry
B. flattening filter
What will be the effect on the isodose distribution when the dose normalization point is moved close
to the chest wall from the breast apex?
A. over wedge
B. under wedge
C. hot spots move medially
D. hot spots move laterally
B. under wedge
The advantage of an electron beam over a kilovoltage X-ray beam for the treatment of superficial
tumors is:
A. better depth dose.
B. lateral coverage and beam definition at depth.
C. decreased dose to bone.
D. higher surface dose.
C. decreased dose to bone.
The five-year survival rate for a pancreatic cancer tumor treated with primary radiation is:
A. 0% to 5%.
B. 5% to 10%.
C. 25% to 30%.
D. 50% to 70%.
A. 0% to 5%.
The histologic type of lung cancer most responsive to radiation and/or chemotherapy is:
A. large cell
B. small cell
C. squamous cell
D. adenocarcinoma
B. small cell
PET, CT, and MRI data can be transferred for image fusion and treatment planning by:
A. PDF.
B. JPEG.
C. TIFF.
D. DICOM.
D. DICOM.
Mayneord F factor corrects for:
A. PDD.
GUIDE.
Extra consideration of immobilization for SBRT patients is needed due to:
A. rapid dose falloff.
B. length of treatment time.
C. multiple beams.
D. increased imaging time.
A. rapid dose falloff.
What lead thickness is required to reduce the transmission to less than 5 percent for a 12.5 x 12.5
cm2, with a 12 MeV electron field?
A. 1.2 mm
B. 3.0 mm
C. 5.6 mm
D. 8.0 mm
C. 5.6 mm
Brachytherapy cervix applicators are often made of titanium because it:
A. is a heavier material than plastic.
B. is a very thick shielding material.
C. minimizes the artifacts on CT.
D. allows fractionation of the dose.
C. minimizes the artifacts on CT.
The storage area for radioactive sources containing encapsulated powder or microspheres should be
ventilated by a direct filtered exhaust to the outdoors because of:
A. lead and lead oxide in the room.
B. possible radioactive material leaks from damaged sources.
C. beta contamination from decay products.
D. NCRP recommendations.
B. possible radioactive material leaks from damaged sources.
For quality assurance of brachytherapy treatment planning computers, the dose rates should agree
with published data tables to which of the following degrees?
A. +- 1%
B. +- 2%
C. +- 3%
D. +- 5%
B. +- 2%
The high dose regions or "horns" near the surface in the periphery of the field are caused by:
A. penumbra
, B. flattening filter
C. scattering foil
D. field asymmetry
B. flattening filter
What will be the effect on the isodose distribution when the dose normalization point is moved close
to the chest wall from the breast apex?
A. over wedge
B. under wedge
C. hot spots move medially
D. hot spots move laterally
B. under wedge
The advantage of an electron beam over a kilovoltage X-ray beam for the treatment of superficial
tumors is:
A. better depth dose.
B. lateral coverage and beam definition at depth.
C. decreased dose to bone.
D. higher surface dose.
C. decreased dose to bone.
The five-year survival rate for a pancreatic cancer tumor treated with primary radiation is:
A. 0% to 5%.
B. 5% to 10%.
C. 25% to 30%.
D. 50% to 70%.
A. 0% to 5%.
The histologic type of lung cancer most responsive to radiation and/or chemotherapy is:
A. large cell
B. small cell
C. squamous cell
D. adenocarcinoma
B. small cell
PET, CT, and MRI data can be transferred for image fusion and treatment planning by:
A. PDF.
B. JPEG.
C. TIFF.
D. DICOM.
D. DICOM.
Mayneord F factor corrects for:
A. PDD.
