MDCB EVALUATION TEST QUESTIONS AND
ANSWERS SET A+
✔✔The relative biological effectiveness for protons is highest where? - ✔✔distal edge of
Bragg peak
✔✔What are the main sites of metastasis for stomach cancer? - ✔✔Peritoneum, lung,
liver
✔✔Definition of Percent Depth Dose (PDD) - ✔✔Dd /Ddmax under SSD conditions
✔✔T2 imaging in MRI displays gray matter as? - ✔✔Grey
✔✔Effective dose in computed tomography is measured in units of: - ✔✔mSv
✔✔A fetus has an exposure limit of: - ✔✔5 mSv
✔✔ list serial structures - ✔✔Spinal cord
brain stem
optic structures
✔✔parallel structures - ✔✔lungs
liver
kidneys
✔✔most common type of prostate cancer - ✔✔adenocarcinoma
✔✔The process of segmentation is: - ✔✔contouring slice by slice
✔✔What is the maximum dose constraint for the Testes? - ✔✔200 cGy
✔✔The recommended occupancy factor, T for a patient exam room is: - ✔✔1/2
, ✔✔What is the RTOG tolerance dose for the small bowel? - ✔✔50 Gy
✔✔Rank the following from lowest LET to highest:
10 MeV proton
alpha particle
250 kVp x-ray
Co-60 gamma ray - ✔✔Co-60, 250 kVp, 10 MeV proton, alpha particle
✔✔Starting at the inferior aspect of the body the rectum begins at: - ✔✔Lowest level of
the ischial tuberosities
✔✔Identify the correct order of components in the treatment head to generate x-rays? -
✔✔target
primary collimator flattening filter
dose chambers
secondary collimator
✔✔Task Group 40 advises annual medical accelerator QA tolerances for gantry rotation
isocenter to be: - ✔✔2mm
✔✔What is the average amount of MLC intraleaf transmission? - ✔✔2-3%
✔✔What is the average amount of MLC interleaf transmission? - ✔✔3-4%
✔✔Average energy equation - ✔✔E/3
✔✔d90 equation - ✔✔E/3.2
✔✔d80 equation - ✔✔E/2.8
✔✔max range equation - ✔✔E/2
✔✔R50 equation - ✔✔E(0)=2.33 MeV/cm *R50
✔✔The reference for Linac shielding is found in which document? - ✔✔NCRP 151
✔✔The quality factor that best represents thermal neutrons is: - ✔✔5
✔✔The quality factor that best represents an alpha particle is - ✔✔20
✔✔The quality factor that best represents fast neutrons is: - ✔✔20
ANSWERS SET A+
✔✔The relative biological effectiveness for protons is highest where? - ✔✔distal edge of
Bragg peak
✔✔What are the main sites of metastasis for stomach cancer? - ✔✔Peritoneum, lung,
liver
✔✔Definition of Percent Depth Dose (PDD) - ✔✔Dd /Ddmax under SSD conditions
✔✔T2 imaging in MRI displays gray matter as? - ✔✔Grey
✔✔Effective dose in computed tomography is measured in units of: - ✔✔mSv
✔✔A fetus has an exposure limit of: - ✔✔5 mSv
✔✔ list serial structures - ✔✔Spinal cord
brain stem
optic structures
✔✔parallel structures - ✔✔lungs
liver
kidneys
✔✔most common type of prostate cancer - ✔✔adenocarcinoma
✔✔The process of segmentation is: - ✔✔contouring slice by slice
✔✔What is the maximum dose constraint for the Testes? - ✔✔200 cGy
✔✔The recommended occupancy factor, T for a patient exam room is: - ✔✔1/2
, ✔✔What is the RTOG tolerance dose for the small bowel? - ✔✔50 Gy
✔✔Rank the following from lowest LET to highest:
10 MeV proton
alpha particle
250 kVp x-ray
Co-60 gamma ray - ✔✔Co-60, 250 kVp, 10 MeV proton, alpha particle
✔✔Starting at the inferior aspect of the body the rectum begins at: - ✔✔Lowest level of
the ischial tuberosities
✔✔Identify the correct order of components in the treatment head to generate x-rays? -
✔✔target
primary collimator flattening filter
dose chambers
secondary collimator
✔✔Task Group 40 advises annual medical accelerator QA tolerances for gantry rotation
isocenter to be: - ✔✔2mm
✔✔What is the average amount of MLC intraleaf transmission? - ✔✔2-3%
✔✔What is the average amount of MLC interleaf transmission? - ✔✔3-4%
✔✔Average energy equation - ✔✔E/3
✔✔d90 equation - ✔✔E/3.2
✔✔d80 equation - ✔✔E/2.8
✔✔max range equation - ✔✔E/2
✔✔R50 equation - ✔✔E(0)=2.33 MeV/cm *R50
✔✔The reference for Linac shielding is found in which document? - ✔✔NCRP 151
✔✔The quality factor that best represents thermal neutrons is: - ✔✔5
✔✔The quality factor that best represents an alpha particle is - ✔✔20
✔✔The quality factor that best represents fast neutrons is: - ✔✔20
