RADIATION THERAPY REGISTRY
STUDY GUIDE
Which is not used to achieve a uniform dose by compensating for missing or curved
tissue?
A. wedges
B. shielding blocks
C. MLC
D. Bolus - Correct Answers -C. MLC
Collimator indicator agreement checks should be performed ___ and have a tolerance
of _____ - Correct Answers -monthly : 1 degree
A light/radiation field coincidence check should be performed _____ and has a
tolerance of ________ - Correct Answers -monthly : 2 mm
MLC transmission should be within: - Correct Answers -.5%
The xray output constancy measured during daily warm up procedure of a medical
accelerator has a tolerance of +/- ? - Correct Answers -3%
It is recommended that medical accelerators with arc therapy capability require
dosimetry checks _____ - Correct Answers -annually
Multileaf collimators must be thick enough to reduce beam transmission through the leaf
itself to less than? - Correct Answers -2%
Mechanical accuracy for stereotactic radiosurgery with regard to isocenter displacement
from the target is : +/- ? - Correct Answers -+/- 1 mm
The recommended tolerance for CT number accuracy for water checked on a daily
basis is? - Correct Answers -+/- 5HU
Level II axillary lymph nodes lie: - Correct Answers -under the pectoralis muscle
As SSD increases, TAR _____ - Correct Answers -remains the same
What all applies to the concept of isocenter? - Correct Answers -- fixed reference point
in space;
,- couch, collimator and gantry all rotate about the isocenter;
- on a LINAC it is 100cm from the target
What factors affect the shape of the isodose curve? - Correct Answers -- beam energy
- SSD
- Field Size
- Source Size
The central Hounsfield Unit within a group of CT numbers is known as: - Correct
Answers -Window Level
Using a system of closed circuit cameras and intercoms during radiation treatments is
considered? - Correct Answers -indirect monitoring
What type of lung cancer is centrally located in the right or left mainstem bronchus? -
Correct Answers -squamous cell carcinoma
Which studies involve ionizing radiation? - Correct Answers -radiography, CT, Nuc Med
Bone scan (Not doppler/sonography/MRI)
Ratio of dose rate with a scattering medium to the dose rate at the same point without a
medium (in air) at dmax. - Correct Answers -backscatter factor
Aka TAR at Dmax
Lymph leaving the cisterna chyli travels to the: - Correct Answers -Thoracic Duct
During a set up of a left breast tx, the therapist did not cover up the patient's right
breast. This is considered: - Correct Answers -invasion of privacy
As SSD increases, PDD - Correct Answers -increases
The TNM staging system assists in all of the following ways except: - Correct Answers -
the agressiveness of the tumor
In radiation therapy, there are two communication standards that are applied to the
electronic medical record for transfer of data and images. those are (2 answers) -
Correct Answers -DICOM & HL7
During what gestation period would radiation most likely cause death to an embryo or
fetus? - Correct Answers -2-3 weeks and after 20 weeks
The TD 5/5 for lens of the eye is? - Correct Answers -500 cGy
The production of free radicals in living tissue most often occurs from irradiation of -
Correct Answers -water
, The para-aortic lymph nodes become the common iliac nodes at the vertebral level of -
Correct Answers -L4
The range of penetration of 12 MEV electrons is - Correct Answers -6 cm
The addition of programmable localization lasers to a CT simulator enable the radiation
oncology team to: - Correct Answers -Choose the exact isocenter during the simulation
process in order to hopefully reduce the amount of port films required on the patient's
first day.
The most common subtype of renal cancer is - Correct Answers -Clear cell carcinoma
The NCRP report No 116 recommends the total dose equivalent limit for a fetus-embryo
not exceed: - Correct Answers -5 mSv
or
0.5 rem
Which of the following cells are most radio-sensitive? - Correct Answers -erythroblasts
Dry and/or moist desquamation typically begins to occur at doses of: - Correct Answers
-4000-6000 cGy
Transportation of radioactive materials is primarily the concern of the: - Correct Answers
-Department of Transportation
Absorbed dose at a depth divided by the dose at D/max at different distances from the
radiation source is? - Correct Answers -PDD
If you are transferring a patient from a wheelchair to the table you should? - Correct
Answers -- Put one foot slightly in front of the other
- flex your knees
- stand directly in front of the patient
Lymphatics from the buccal mucosa primarily drain into the: - Correct Answers -
submental nodes
What is the minimum thickness of cerrobend required to fabricate an electron cutout for
a 15 MeV electron beam? - Correct Answers -8.5 cm
What are the two most common sites of distant mets from colorectal cancer? - Correct
Answers -liver, lung
In the x,y, z coordinate system, the "z" represents the: - Correct Answers -coronal plane
STUDY GUIDE
Which is not used to achieve a uniform dose by compensating for missing or curved
tissue?
A. wedges
B. shielding blocks
C. MLC
D. Bolus - Correct Answers -C. MLC
Collimator indicator agreement checks should be performed ___ and have a tolerance
of _____ - Correct Answers -monthly : 1 degree
A light/radiation field coincidence check should be performed _____ and has a
tolerance of ________ - Correct Answers -monthly : 2 mm
MLC transmission should be within: - Correct Answers -.5%
The xray output constancy measured during daily warm up procedure of a medical
accelerator has a tolerance of +/- ? - Correct Answers -3%
It is recommended that medical accelerators with arc therapy capability require
dosimetry checks _____ - Correct Answers -annually
Multileaf collimators must be thick enough to reduce beam transmission through the leaf
itself to less than? - Correct Answers -2%
Mechanical accuracy for stereotactic radiosurgery with regard to isocenter displacement
from the target is : +/- ? - Correct Answers -+/- 1 mm
The recommended tolerance for CT number accuracy for water checked on a daily
basis is? - Correct Answers -+/- 5HU
Level II axillary lymph nodes lie: - Correct Answers -under the pectoralis muscle
As SSD increases, TAR _____ - Correct Answers -remains the same
What all applies to the concept of isocenter? - Correct Answers -- fixed reference point
in space;
,- couch, collimator and gantry all rotate about the isocenter;
- on a LINAC it is 100cm from the target
What factors affect the shape of the isodose curve? - Correct Answers -- beam energy
- SSD
- Field Size
- Source Size
The central Hounsfield Unit within a group of CT numbers is known as: - Correct
Answers -Window Level
Using a system of closed circuit cameras and intercoms during radiation treatments is
considered? - Correct Answers -indirect monitoring
What type of lung cancer is centrally located in the right or left mainstem bronchus? -
Correct Answers -squamous cell carcinoma
Which studies involve ionizing radiation? - Correct Answers -radiography, CT, Nuc Med
Bone scan (Not doppler/sonography/MRI)
Ratio of dose rate with a scattering medium to the dose rate at the same point without a
medium (in air) at dmax. - Correct Answers -backscatter factor
Aka TAR at Dmax
Lymph leaving the cisterna chyli travels to the: - Correct Answers -Thoracic Duct
During a set up of a left breast tx, the therapist did not cover up the patient's right
breast. This is considered: - Correct Answers -invasion of privacy
As SSD increases, PDD - Correct Answers -increases
The TNM staging system assists in all of the following ways except: - Correct Answers -
the agressiveness of the tumor
In radiation therapy, there are two communication standards that are applied to the
electronic medical record for transfer of data and images. those are (2 answers) -
Correct Answers -DICOM & HL7
During what gestation period would radiation most likely cause death to an embryo or
fetus? - Correct Answers -2-3 weeks and after 20 weeks
The TD 5/5 for lens of the eye is? - Correct Answers -500 cGy
The production of free radicals in living tissue most often occurs from irradiation of -
Correct Answers -water
, The para-aortic lymph nodes become the common iliac nodes at the vertebral level of -
Correct Answers -L4
The range of penetration of 12 MEV electrons is - Correct Answers -6 cm
The addition of programmable localization lasers to a CT simulator enable the radiation
oncology team to: - Correct Answers -Choose the exact isocenter during the simulation
process in order to hopefully reduce the amount of port films required on the patient's
first day.
The most common subtype of renal cancer is - Correct Answers -Clear cell carcinoma
The NCRP report No 116 recommends the total dose equivalent limit for a fetus-embryo
not exceed: - Correct Answers -5 mSv
or
0.5 rem
Which of the following cells are most radio-sensitive? - Correct Answers -erythroblasts
Dry and/or moist desquamation typically begins to occur at doses of: - Correct Answers
-4000-6000 cGy
Transportation of radioactive materials is primarily the concern of the: - Correct Answers
-Department of Transportation
Absorbed dose at a depth divided by the dose at D/max at different distances from the
radiation source is? - Correct Answers -PDD
If you are transferring a patient from a wheelchair to the table you should? - Correct
Answers -- Put one foot slightly in front of the other
- flex your knees
- stand directly in front of the patient
Lymphatics from the buccal mucosa primarily drain into the: - Correct Answers -
submental nodes
What is the minimum thickness of cerrobend required to fabricate an electron cutout for
a 15 MeV electron beam? - Correct Answers -8.5 cm
What are the two most common sites of distant mets from colorectal cancer? - Correct
Answers -liver, lung
In the x,y, z coordinate system, the "z" represents the: - Correct Answers -coronal plane
