MDCB UPDATED REVISION TEST QUESTIONS AND
ANSWERS MARKED A+
✔✔A radiation oncology department has a selection of 6, 10, and 18 MV photon beams.
For a 7 beam prostate intensity modulated radiation therapy (IMRT) plan, would be
appropriated to select: - ✔✔A 6mv photon beam b/c it would deliver no neutron dose
and the lowest doses to the tissue outside the planning target volume
or
2014 MDCB 10 MV photon beam bc it would deliver a lower neutron dose than an 18
mv photon beam and clinically be accepatable dose to rectum and bladder
✔✔What will result if a photon field abuts an electron field at the skin surface? - ✔✔a
photon side hot spot, electron side cold spot
✔✔Ap and RPO and LPO would make a - ✔✔hexagon shape
✔✔The radiation therapy technique which utilizes many shaped beams which may not
conform to the target volume to achieve a highly conformal distribution is: - ✔✔intensity
modulated radiation therapy
✔✔Characteristics of multileaf collimators, in current medical linacs, include which of
the following: - ✔✔"scalloped" isodose curves in the penumbra region
✔✔The minimum nominal distance a tissue compensator should be placed from the
skin surface without affecting the skin sparing effect is? - ✔✔20cm
✔✔Rounded ends on the leaves of a multi-leaf collimator are used to: - ✔✔achieve a
constant penumbra as field size varies
✔✔Which calculation method independently calculates the primary and the scattered
components of dose at a point in the calculation volume? - ✔✔convolution superposition
✔✔When an isocentric tech is used in place of an SSD technique (both beams treated
at 100 SSD) to deliver the same dose to a patient with two parallel opposed fields, the -
✔✔ratio of maximum dose to midpoint dose is increased
✔✔Based on NCRP recommendations, which of the following is/are guidelines
regarding pregnancy and radiation exposure - ✔✔pregnant medical radiation workers
can be considered occupationally exposed individuals
✔✔The dose response model applied to establishing dose limits for occupational
workers is the - ✔✔Linear no-threshold model
, ✔✔Which of the followning statements are true - ✔✔the term "caution" or "danger" may
be used in "high radiation areas"
✔✔Which of the following is excluded from " the health insurance portability and
accountability act of 1996" - ✔✔public statistics authorities
✔✔The industry-standard format for transferring images between components of a
network is called: - ✔✔digital imaging and communications in medicine (DICOM)
✔✔How many bytes constitute a gigabyte - ✔✔1e9
✔✔The five year cure rate for a bladder cancer tumor treated with primary radiation is -
✔✔25-30%
✔✔Which of the following nuclear transitions produces only gamma radiation? -
✔✔Isomeric
Metastable isomers A nucleus produced this way generally starts its existence in an
excited state that relaxes through the emission of one or more gamma rays tc 99m
✔✔The fusion of MRI and CT images is used in head and neck tumors. The most
appropriated MRI sequence is a : - ✔✔T2 image
✔✔For which of the followning is PET imaging used? - ✔✔Tumor volume delineation
✔✔Depth dose curve - ✔✔electrons
✔✔What term best describes a major influence on image resolution for most CT
scanners - ✔✔Voxel
✔✔HIPPA stands for - ✔✔Health Insurance Portability and Accountability Act
✔✔What is the rest mass of a proton, if converted to energy? - ✔✔938 MeV
✔✔A typical element for electron beam scattering foil is made out of: - ✔✔Gold/lead
✔✔What of the following is true regarding orthovoltage x-rays - ✔✔They have a half
value layer between 1-4mm copper
✔✔The five year survival rate for an esophageal cancer turmor treated with primary
radiation is: - ✔✔5-10%
✔✔Irradiation of which of the followning structures is most likely to result in symptomatic
late toxicity when treating pediatric neuroblastoma? - ✔✔bone
ANSWERS MARKED A+
✔✔A radiation oncology department has a selection of 6, 10, and 18 MV photon beams.
For a 7 beam prostate intensity modulated radiation therapy (IMRT) plan, would be
appropriated to select: - ✔✔A 6mv photon beam b/c it would deliver no neutron dose
and the lowest doses to the tissue outside the planning target volume
or
2014 MDCB 10 MV photon beam bc it would deliver a lower neutron dose than an 18
mv photon beam and clinically be accepatable dose to rectum and bladder
✔✔What will result if a photon field abuts an electron field at the skin surface? - ✔✔a
photon side hot spot, electron side cold spot
✔✔Ap and RPO and LPO would make a - ✔✔hexagon shape
✔✔The radiation therapy technique which utilizes many shaped beams which may not
conform to the target volume to achieve a highly conformal distribution is: - ✔✔intensity
modulated radiation therapy
✔✔Characteristics of multileaf collimators, in current medical linacs, include which of
the following: - ✔✔"scalloped" isodose curves in the penumbra region
✔✔The minimum nominal distance a tissue compensator should be placed from the
skin surface without affecting the skin sparing effect is? - ✔✔20cm
✔✔Rounded ends on the leaves of a multi-leaf collimator are used to: - ✔✔achieve a
constant penumbra as field size varies
✔✔Which calculation method independently calculates the primary and the scattered
components of dose at a point in the calculation volume? - ✔✔convolution superposition
✔✔When an isocentric tech is used in place of an SSD technique (both beams treated
at 100 SSD) to deliver the same dose to a patient with two parallel opposed fields, the -
✔✔ratio of maximum dose to midpoint dose is increased
✔✔Based on NCRP recommendations, which of the following is/are guidelines
regarding pregnancy and radiation exposure - ✔✔pregnant medical radiation workers
can be considered occupationally exposed individuals
✔✔The dose response model applied to establishing dose limits for occupational
workers is the - ✔✔Linear no-threshold model
, ✔✔Which of the followning statements are true - ✔✔the term "caution" or "danger" may
be used in "high radiation areas"
✔✔Which of the following is excluded from " the health insurance portability and
accountability act of 1996" - ✔✔public statistics authorities
✔✔The industry-standard format for transferring images between components of a
network is called: - ✔✔digital imaging and communications in medicine (DICOM)
✔✔How many bytes constitute a gigabyte - ✔✔1e9
✔✔The five year cure rate for a bladder cancer tumor treated with primary radiation is -
✔✔25-30%
✔✔Which of the following nuclear transitions produces only gamma radiation? -
✔✔Isomeric
Metastable isomers A nucleus produced this way generally starts its existence in an
excited state that relaxes through the emission of one or more gamma rays tc 99m
✔✔The fusion of MRI and CT images is used in head and neck tumors. The most
appropriated MRI sequence is a : - ✔✔T2 image
✔✔For which of the followning is PET imaging used? - ✔✔Tumor volume delineation
✔✔Depth dose curve - ✔✔electrons
✔✔What term best describes a major influence on image resolution for most CT
scanners - ✔✔Voxel
✔✔HIPPA stands for - ✔✔Health Insurance Portability and Accountability Act
✔✔What is the rest mass of a proton, if converted to energy? - ✔✔938 MeV
✔✔A typical element for electron beam scattering foil is made out of: - ✔✔Gold/lead
✔✔What of the following is true regarding orthovoltage x-rays - ✔✔They have a half
value layer between 1-4mm copper
✔✔The five year survival rate for an esophageal cancer turmor treated with primary
radiation is: - ✔✔5-10%
✔✔Irradiation of which of the followning structures is most likely to result in symptomatic
late toxicity when treating pediatric neuroblastoma? - ✔✔bone
