MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED
GUIDE.
According to QUANTEC guidelines, in order to avoid a 5% risk of dysfuntion, less than 55% of the
volume of Kidneys should receive what dose?
A. 6 Gy
B. 12 Gy
C. 24 Gy
D. 32 Gy
B. 12 Gy
According to QUANTEC guidelines, what rate of spinal cord myelopathy would be expected if 70 Gy
were delivered to the spinal cord with conventional fractionation of 2 Gy per day?
A. < 5%
B. 20%
C. 50%
D. 100%
C. 50%
A radiation oncologist is designing a phase I clinical trial for lung cancer. Which of the following
scenarios is an example of such a trial?
A. Patients are treated in sequential groups with each subsequent group receiving a higher dose of
Radiation Therapy until toxicity is noted and maximum tolerance is determined.
B. Patients are assigned into two separate groups A and B. Group A is to receive Radiation Therapy
once daily and Group B is to receive Radiation Therapy two times a day (BID).
C. Testing of a drug in combination with Radiation Therapy (concurrent chemoradiation) is used to
compare the survival of this group with patients that previously received radiotherapy alone.
D. The radiation oncologist states that the study is being done to study the long term side effects of a
drug used in combination with Radiation Therapy.
A. Patients are treated in sequential groups with each subsequent group receiving a higher dose of
Radiation Therapy until toxicity is noted and maximum tolerance is determined.
The ICRU Report # 83 from 2010 recommends the use of the homogeneity index (HI) to assess the
over and under dosages within the target volume. Which of the following descriptions best
characterizes the homogeneity index?
A. An HI value of zero is not desirable for IMRT planning.
B. The HI is used to determine the conformity of the isodose shape.
C. A larger HI value indicates a more inhomogeneous dose distribution
D. A smaller HI value indicates a more inhomogeneous dose distribution.
C. A larger HI value indicates a more inhomogeneous dose distribution
The purpose of a Cyclotron is to?
A. degrade energy of protons used for treatment.
, B. accelerate heavy particles, such as Carbon ions.
C. generate RF power for a klystron.
D. produce electrons for acceleration in a waveguide.
B. accelerate heavy particles, such as Carbon ions.
Which of the following algorithms is the fastest and most accurate with respect to calculating photon
beam doses in the presence of tissue inhomogeneities?
A. convolution methods
B. Monte Carlo methods
C. Deterministic methods
D. Factor based correction methods.
B. Monte Carlo methods
When an MU setting for an isocentric whole brain field is calculated, the calculation must consider
which of the following?
A. source-to-skin distance
B. wedge factors
C. MLC transmission factor
D. collimator jaw settings
D. collimator jaw settings
Internal conversion is followed by emission of:
A. protons.
B. positrons.
C. auger electrons.
D. neutrinos.
C. auger electrons.
Acceptance testing and commissioning of a dosimetry treatment planning computer would include
checking which of the following?
A. Checking the accuracy of input digitizers.
B. Visualizing isodose curves.
C. Verifying algorithm modeling.
D. Assuring output constancy.
A. Checking the accuracy of input digitizers.
The off-axis factor (OAF) is dependent on which of the following?
A. The degree of tilt the isodose curve endures at the central ray.
B. An isodose curve profile at a depth of 10cm.
C. The lateral distance between the 90% and 20% isodose lines at Dmax.
D. Distance of a point from the central axis.
D. Distance of a point from the central axis.
GUIDE.
According to QUANTEC guidelines, in order to avoid a 5% risk of dysfuntion, less than 55% of the
volume of Kidneys should receive what dose?
A. 6 Gy
B. 12 Gy
C. 24 Gy
D. 32 Gy
B. 12 Gy
According to QUANTEC guidelines, what rate of spinal cord myelopathy would be expected if 70 Gy
were delivered to the spinal cord with conventional fractionation of 2 Gy per day?
A. < 5%
B. 20%
C. 50%
D. 100%
C. 50%
A radiation oncologist is designing a phase I clinical trial for lung cancer. Which of the following
scenarios is an example of such a trial?
A. Patients are treated in sequential groups with each subsequent group receiving a higher dose of
Radiation Therapy until toxicity is noted and maximum tolerance is determined.
B. Patients are assigned into two separate groups A and B. Group A is to receive Radiation Therapy
once daily and Group B is to receive Radiation Therapy two times a day (BID).
C. Testing of a drug in combination with Radiation Therapy (concurrent chemoradiation) is used to
compare the survival of this group with patients that previously received radiotherapy alone.
D. The radiation oncologist states that the study is being done to study the long term side effects of a
drug used in combination with Radiation Therapy.
A. Patients are treated in sequential groups with each subsequent group receiving a higher dose of
Radiation Therapy until toxicity is noted and maximum tolerance is determined.
The ICRU Report # 83 from 2010 recommends the use of the homogeneity index (HI) to assess the
over and under dosages within the target volume. Which of the following descriptions best
characterizes the homogeneity index?
A. An HI value of zero is not desirable for IMRT planning.
B. The HI is used to determine the conformity of the isodose shape.
C. A larger HI value indicates a more inhomogeneous dose distribution
D. A smaller HI value indicates a more inhomogeneous dose distribution.
C. A larger HI value indicates a more inhomogeneous dose distribution
The purpose of a Cyclotron is to?
A. degrade energy of protons used for treatment.
, B. accelerate heavy particles, such as Carbon ions.
C. generate RF power for a klystron.
D. produce electrons for acceleration in a waveguide.
B. accelerate heavy particles, such as Carbon ions.
Which of the following algorithms is the fastest and most accurate with respect to calculating photon
beam doses in the presence of tissue inhomogeneities?
A. convolution methods
B. Monte Carlo methods
C. Deterministic methods
D. Factor based correction methods.
B. Monte Carlo methods
When an MU setting for an isocentric whole brain field is calculated, the calculation must consider
which of the following?
A. source-to-skin distance
B. wedge factors
C. MLC transmission factor
D. collimator jaw settings
D. collimator jaw settings
Internal conversion is followed by emission of:
A. protons.
B. positrons.
C. auger electrons.
D. neutrinos.
C. auger electrons.
Acceptance testing and commissioning of a dosimetry treatment planning computer would include
checking which of the following?
A. Checking the accuracy of input digitizers.
B. Visualizing isodose curves.
C. Verifying algorithm modeling.
D. Assuring output constancy.
A. Checking the accuracy of input digitizers.
The off-axis factor (OAF) is dependent on which of the following?
A. The degree of tilt the isodose curve endures at the central ray.
B. An isodose curve profile at a depth of 10cm.
C. The lateral distance between the 90% and 20% isodose lines at Dmax.
D. Distance of a point from the central axis.
D. Distance of a point from the central axis.
