MDCB Practice Test Multiple Choice |300 questions
with verified answers
. Prior to the administration of a brachytherapy remote afterloading
treatment, the following is required: Ans✓✓✓ independent
confirmation of treatment time.
. The tail of an electron beam depth dose curve represents which of the
following? Ans✓✓✓ X-ray contamination.
A "field-in-field" technique is designed to decrease: Ans✓✓✓ hot
spots.
A "spike" in a differential DVH, is mathematically called a: Ans✓✓✓
delta function
A 10x10 electron cone was damaged in the treatment room. A
replacement cone was ordered. Which of the following statements is
TRUE? Ans✓✓✓ The output must be measured for any new cone.
A 12 MeV electron beam displays which of the following
characteristics? Ans✓✓✓ depth of 80% dose is approximately 4.0 cm
A beam degrader/spoiler is used in a photon beam for TBI in order to:
Ans✓✓✓ increase surface dose to the patient
,A bite block head and neck immobilization device has advantages over
an external mask because the: Ans✓✓✓ patient may feel less
claustrophobic.
A computer network that is limited to a single division or small group in
one geographical location is called a: Ans✓✓✓ Local Area Network
A cork or bite block should be placed in the patient's mouth to avoid
unnecessary irradiation of the tongue and floor of mouth when
simulating and treating the: Ans✓✓✓ maxillary antrum.
A customized bite block may be used to do which of the following?
Ans✓✓✓ secure a reproducible jaw position.
A network router: Ans✓✓✓ enables safe sharing of resources among
network device
A new software release is installed on your treatment planning system
and all required beam data has been updated for your treatment unit.
Before using the system for routine clinical use, it is prudent to:
Ans✓✓✓ check the calculation of doses in and beyond
heterogeneities.
,A patient arrives to begin radiotherapy three weeks after the treatment
plan was completed when it is determined that the patient has gained
considerable weight and there is increased girth over the treatment
area, the CMD should: Ans✓✓✓ inform the radiation oncologist that
there is an apparent change in the patient's size and a new treatment
plan may be needed
A patient is to receive 55 Gy to a tumor in the mediastinum. In order to
meet the acceptable dose limits for the spinal cord, you could:
Ans✓✓✓ utilize a 3DCRT beam arrangement including oblique beam
angles.
A Qualified Medical Dosimetrist is an individual who has the knowledge
and skills to practice under the supervision of a: Ans✓✓✓ Licensed
Practitioner and a Qualified Medical Physicist
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?
Ans✓✓✓ 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.
A radioactive source is considered to be isotropic if it exhibits which of
the following characteristics? Ans✓✓✓ Intensity around the source is
equal in all directions.
, A seminoma is being treated with radiation using conventional AP/PA
treatment fields. Which of the following structures must be localized
and monitored if a standard dose for seminoma is employed?
Ans✓✓✓ kidneys
A small area of high density near the surface of the patient would have
the greatest impact on the dose near the edge of the high density area
with:
*remember:
Increasing electron energy = increased skin dose Ans✓✓✓ a single 20
MeV electron field
According to AAPM Task Group 142, regarding the QA of medical
accelerators, what is the monthly tolerance for scaling when
considering SRS/SBRT Planar kV imaging? Ans✓✓✓ ≤ 2mm
According to AAPM TG Report #142 standards, what is the minimum
frequency for checking the door interlock? Ans✓✓✓ daily
According to AAPM TG Report #142, when performing periodic LINAC
quality assurance procedures, which of the following is the acceptable
tolerance for electron flatness? Ans✓✓✓ 3%
with verified answers
. Prior to the administration of a brachytherapy remote afterloading
treatment, the following is required: Ans✓✓✓ independent
confirmation of treatment time.
. The tail of an electron beam depth dose curve represents which of the
following? Ans✓✓✓ X-ray contamination.
A "field-in-field" technique is designed to decrease: Ans✓✓✓ hot
spots.
A "spike" in a differential DVH, is mathematically called a: Ans✓✓✓
delta function
A 10x10 electron cone was damaged in the treatment room. A
replacement cone was ordered. Which of the following statements is
TRUE? Ans✓✓✓ The output must be measured for any new cone.
A 12 MeV electron beam displays which of the following
characteristics? Ans✓✓✓ depth of 80% dose is approximately 4.0 cm
A beam degrader/spoiler is used in a photon beam for TBI in order to:
Ans✓✓✓ increase surface dose to the patient
,A bite block head and neck immobilization device has advantages over
an external mask because the: Ans✓✓✓ patient may feel less
claustrophobic.
A computer network that is limited to a single division or small group in
one geographical location is called a: Ans✓✓✓ Local Area Network
A cork or bite block should be placed in the patient's mouth to avoid
unnecessary irradiation of the tongue and floor of mouth when
simulating and treating the: Ans✓✓✓ maxillary antrum.
A customized bite block may be used to do which of the following?
Ans✓✓✓ secure a reproducible jaw position.
A network router: Ans✓✓✓ enables safe sharing of resources among
network device
A new software release is installed on your treatment planning system
and all required beam data has been updated for your treatment unit.
Before using the system for routine clinical use, it is prudent to:
Ans✓✓✓ check the calculation of doses in and beyond
heterogeneities.
,A patient arrives to begin radiotherapy three weeks after the treatment
plan was completed when it is determined that the patient has gained
considerable weight and there is increased girth over the treatment
area, the CMD should: Ans✓✓✓ inform the radiation oncologist that
there is an apparent change in the patient's size and a new treatment
plan may be needed
A patient is to receive 55 Gy to a tumor in the mediastinum. In order to
meet the acceptable dose limits for the spinal cord, you could:
Ans✓✓✓ utilize a 3DCRT beam arrangement including oblique beam
angles.
A Qualified Medical Dosimetrist is an individual who has the knowledge
and skills to practice under the supervision of a: Ans✓✓✓ Licensed
Practitioner and a Qualified Medical Physicist
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?
Ans✓✓✓ 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.
A radioactive source is considered to be isotropic if it exhibits which of
the following characteristics? Ans✓✓✓ Intensity around the source is
equal in all directions.
, A seminoma is being treated with radiation using conventional AP/PA
treatment fields. Which of the following structures must be localized
and monitored if a standard dose for seminoma is employed?
Ans✓✓✓ kidneys
A small area of high density near the surface of the patient would have
the greatest impact on the dose near the edge of the high density area
with:
*remember:
Increasing electron energy = increased skin dose Ans✓✓✓ a single 20
MeV electron field
According to AAPM Task Group 142, regarding the QA of medical
accelerators, what is the monthly tolerance for scaling when
considering SRS/SBRT Planar kV imaging? Ans✓✓✓ ≤ 2mm
According to AAPM TG Report #142 standards, what is the minimum
frequency for checking the door interlock? Ans✓✓✓ daily
According to AAPM TG Report #142, when performing periodic LINAC
quality assurance procedures, which of the following is the acceptable
tolerance for electron flatness? Ans✓✓✓ 3%
