MDCB ALL QUESTIONS AND ANSWERS SET A+
✔✔List from lowest to highest the CT numbers of the respective tissues:
fat
bone
thyroid
lung
kidney - ✔✔Lung
fat
kidney
thyroid
bone
✔✔Task group 100 gives recommendations on what subject? - ✔✔Risk Management
✔✔Identify the Quantec rectal constraint of 50%: - ✔✔V50
✔✔When using a single fraction SRS treatment, what constraint is placed on the spinal
cord? - ✔✔13 Gy
✔✔What is the RTOG tolerance dose for the optic nerve? - ✔✔5400 cGy
✔✔The four R's of fractionated radiation biology are: - ✔✔Repair
Reoxygenation
Repopulation
Redistribution
✔✔T1 imaging in MRI displays white matter as? - ✔✔Dark Grey
✔✔The V25 planning constraint for the heart is: - ✔✔V25<10%
✔✔In MRI the magnetic field strength used is measured in: - ✔✔tesla
, ✔✔Computer tomography resolution is approximately: - ✔✔0.5mm
✔✔The alpha/beta ratio for colon? - ✔✔10
✔✔Derivation of dose kernals come from: - ✔✔Monte Carlo
✔✔An AP/PA arrangement generates a hot spot in the following location: - ✔✔Entrance
and exit of each field at the depth of dmax
✔✔Isotones have the same number of which particle? - ✔✔Neutrons
the N in isotones
✔✔List in order from lowest energy to highest energy for the following isotopes:
Ir-192, Au-198, Pd-103, Ra-226, Cs-137 - ✔✔Pd-103
Ir-192
Au-198
Cs-137
Ra-226
✔✔MF Equation - ✔✔first is 2 over 1 with d
second is 1 over 2 for dmax
(SSD2+d)/(SSD1+d)^2 * (SSD1+dmax)/(SSD2+dmax)^2
✔✔The exposure rate limit to the General Public in any single hour should be <: - ✔✔2
mR/hr
✔✔The half-life for the isotope used for the treatment of thyroid cancer is approximately:
- ✔✔8.06 days
✔✔Task Group 142 suggests monthly QA tolerances for lateral, longitudinal, and
rotational couch positions for IMRT to be: - ✔✔2mm: 1 degree
✔✔Task Group 142 is a document that gives recommendations on what? - ✔✔Linac QA
✔✔Primovist is used as contrast agent for imaging hepatic metastasis? Which MR
sequence benefits from this gadolinium-based contrast? - ✔✔T1 imaging
✔✔Proton inhomogeniety when compared to photon inhomogeniety is? - ✔✔more
✔✔What type of isotope is used to treat polycythemia vera? - ✔✔Phosphorus
✔✔List from lowest to highest the CT numbers of the respective tissues:
fat
bone
thyroid
lung
kidney - ✔✔Lung
fat
kidney
thyroid
bone
✔✔Task group 100 gives recommendations on what subject? - ✔✔Risk Management
✔✔Identify the Quantec rectal constraint of 50%: - ✔✔V50
✔✔When using a single fraction SRS treatment, what constraint is placed on the spinal
cord? - ✔✔13 Gy
✔✔What is the RTOG tolerance dose for the optic nerve? - ✔✔5400 cGy
✔✔The four R's of fractionated radiation biology are: - ✔✔Repair
Reoxygenation
Repopulation
Redistribution
✔✔T1 imaging in MRI displays white matter as? - ✔✔Dark Grey
✔✔The V25 planning constraint for the heart is: - ✔✔V25<10%
✔✔In MRI the magnetic field strength used is measured in: - ✔✔tesla
, ✔✔Computer tomography resolution is approximately: - ✔✔0.5mm
✔✔The alpha/beta ratio for colon? - ✔✔10
✔✔Derivation of dose kernals come from: - ✔✔Monte Carlo
✔✔An AP/PA arrangement generates a hot spot in the following location: - ✔✔Entrance
and exit of each field at the depth of dmax
✔✔Isotones have the same number of which particle? - ✔✔Neutrons
the N in isotones
✔✔List in order from lowest energy to highest energy for the following isotopes:
Ir-192, Au-198, Pd-103, Ra-226, Cs-137 - ✔✔Pd-103
Ir-192
Au-198
Cs-137
Ra-226
✔✔MF Equation - ✔✔first is 2 over 1 with d
second is 1 over 2 for dmax
(SSD2+d)/(SSD1+d)^2 * (SSD1+dmax)/(SSD2+dmax)^2
✔✔The exposure rate limit to the General Public in any single hour should be <: - ✔✔2
mR/hr
✔✔The half-life for the isotope used for the treatment of thyroid cancer is approximately:
- ✔✔8.06 days
✔✔Task Group 142 suggests monthly QA tolerances for lateral, longitudinal, and
rotational couch positions for IMRT to be: - ✔✔2mm: 1 degree
✔✔Task Group 142 is a document that gives recommendations on what? - ✔✔Linac QA
✔✔Primovist is used as contrast agent for imaging hepatic metastasis? Which MR
sequence benefits from this gadolinium-based contrast? - ✔✔T1 imaging
✔✔Proton inhomogeniety when compared to photon inhomogeniety is? - ✔✔more
✔✔What type of isotope is used to treat polycythemia vera? - ✔✔Phosphorus
