MDCB REVIEW TIPS QUESTIONS AND ANSWERS SET
A+
✔✔Management of patients with implanted cardiac pacemakers and defibrillators. can
be found in which AAPM Task Group?? - ✔✔TG-203
✔✔Identify the 10CFR 20 limit for the Public in Sv. - ✔✔0.001 Sv
✔✔SBRT uses a factor called D2. What does it represent? - ✔✔maximum total dose in
Gy to any point 2 cm or greater away from the PTV in any direction
✔✔PET imaging is based on a fundamental process. Choose the correct one. - ✔✔B+
decay
✔✔Choose the correct vertebral level that the carina is located at? - ✔✔T4-T5
✔✔Stereotactic body radiotherapy utilizes a factor called R50. What does it represent? -
✔✔The ratio of the volume of 50% of the Rx dose isodose to the volume of the PTV
✔✔For shielding, what is the design goal for a restricted area? - ✔✔0.1 mSv/wk
✔✔For shielding, what is the design goal for a unrestricted area? - ✔✔0.02 mSv/week
✔✔RTOG identifies the Bladder dose constraint of 15% at what volume? - ✔✔V80
✔✔Total body irradiation uses which site as it's primary prescription point. -
✔✔umbilicus
✔✔The 'active length' of a brachytherapy source is: - ✔✔Shorter than the physical
length
, ✔✔Identify the particles that can be classified as indirectly ionizing radiation - ✔✔not
charged particles
neutrons
gammas
✔✔directly ionizing radiation - ✔✔Charged particles
alpha
beta
protons
electrons
✔✔When using a single fraction SRS treatment, what constraint is placed on the optic
nerve / chiasm? - ✔✔12 Gy
✔✔stochastic effects - ✔✔- Not categorized by severity but by their incidence
- Based on Probability of Occurrence
-Cancer is an example
-Leukemia is an example
✔✔Deterministic effects - ✔✔non-stochastic effects
- Severity is based on Increasing Exposure
-A minimum Threshold Dose must be received
-Erythema is an example
✔✔Leak tests made on a sealed source occur at what frequency? - ✔✔6 months
✔✔Identify the physical density of lung tissue? - ✔✔0.30 gm /cm3
✔✔Prior to a prostate seed implant a sample of the seeds needs to be sampled for a
calibration check. Choose the amount required for sampling. - ✔✔10%
✔✔Percent depth dose is dependent on a series of factors. Choose the correct ones. -
✔✔Depth
Energy
SSD
field size
✔✔When using a single fraction SRS treatment, what constraint is placed on the
brainstem? - ✔✔12.5 Gy
A+
✔✔Management of patients with implanted cardiac pacemakers and defibrillators. can
be found in which AAPM Task Group?? - ✔✔TG-203
✔✔Identify the 10CFR 20 limit for the Public in Sv. - ✔✔0.001 Sv
✔✔SBRT uses a factor called D2. What does it represent? - ✔✔maximum total dose in
Gy to any point 2 cm or greater away from the PTV in any direction
✔✔PET imaging is based on a fundamental process. Choose the correct one. - ✔✔B+
decay
✔✔Choose the correct vertebral level that the carina is located at? - ✔✔T4-T5
✔✔Stereotactic body radiotherapy utilizes a factor called R50. What does it represent? -
✔✔The ratio of the volume of 50% of the Rx dose isodose to the volume of the PTV
✔✔For shielding, what is the design goal for a restricted area? - ✔✔0.1 mSv/wk
✔✔For shielding, what is the design goal for a unrestricted area? - ✔✔0.02 mSv/week
✔✔RTOG identifies the Bladder dose constraint of 15% at what volume? - ✔✔V80
✔✔Total body irradiation uses which site as it's primary prescription point. -
✔✔umbilicus
✔✔The 'active length' of a brachytherapy source is: - ✔✔Shorter than the physical
length
, ✔✔Identify the particles that can be classified as indirectly ionizing radiation - ✔✔not
charged particles
neutrons
gammas
✔✔directly ionizing radiation - ✔✔Charged particles
alpha
beta
protons
electrons
✔✔When using a single fraction SRS treatment, what constraint is placed on the optic
nerve / chiasm? - ✔✔12 Gy
✔✔stochastic effects - ✔✔- Not categorized by severity but by their incidence
- Based on Probability of Occurrence
-Cancer is an example
-Leukemia is an example
✔✔Deterministic effects - ✔✔non-stochastic effects
- Severity is based on Increasing Exposure
-A minimum Threshold Dose must be received
-Erythema is an example
✔✔Leak tests made on a sealed source occur at what frequency? - ✔✔6 months
✔✔Identify the physical density of lung tissue? - ✔✔0.30 gm /cm3
✔✔Prior to a prostate seed implant a sample of the seeds needs to be sampled for a
calibration check. Choose the amount required for sampling. - ✔✔10%
✔✔Percent depth dose is dependent on a series of factors. Choose the correct ones. -
✔✔Depth
Energy
SSD
field size
✔✔When using a single fraction SRS treatment, what constraint is placed on the
brainstem? - ✔✔12.5 Gy
