ONS Radiation Therapy Certificate - Section 3 (Treatment) || with
Error-free Answers.
Goal of radiation correct answers - to irradiate a predefined target volume while minimizing
exposure to adjacent normal tissues.
- Radiation oncologists and medical oncologists collaborate to determine overall goals and
treatment approaches.
- Multiple diagnostic procedures are employed to define the tumor volume and prescribe the
correct dose of radiation.
- Radiation physicists, dosimetrists, oncologists, and therapists use sophisticated hardware and
software to model geometric and dosimetric planning to ensure quality and accuracy.
dosimetrist correct answers part of radiation therapy team who calculates the absorbed dose of
radiation in matter and tissues
Successful treatment correct answers depends upon accurate writing and interpretation of the
radiation prescription.
treatment volume correct answers - the area that requires direct irradiation.
GTV - Gross tumor volume correct answers The visible tumor - the malignant growth that is felt
or seen on imaging
CTV - Clinical tumor volume correct answers The tissue that includes the GTV and the
microscopic malignant tissue
, PTV - Planning target volume correct answers The additional margins added to CTV to account
for the pt movement, tumor growth, and inaccuracies in calculations
treated volume correct answers the volume enclosed by an isodose surface that is determined by
the RO to be appropriate for the tx of this person and condition - 95% isodose surface
isodose correct answers radiation dose of equal intensity to more than one body area
irradiated volume correct answers the volume that receives a dose significant in relation to
normal tissue tolerance
Organs at risk (OARs) correct answers normal tissues whose radiosensitivity and location may
determine the course of treatment planning.
ICRU 50 - reference point correct answers the point that should be in the central part of the PTV.
It should be unambiguous, accurately determined, and clinically relevant.
Dose volume histograms (DVHs) correct answers complex models used in the reporting and
evaluating of 3D radiotherapy dose distribution
planning correct answers ensures the most accurate delivery of the most accurate dose, and
includes:
Determining patient positioning/immobilization to ensure consistent positioning throughout
treatment course
Data from computed tomography, magnetic resonance imaging, positron emission tomography,
and manual contouring
Definition of the treatment volumes and the OARs
The design of the treatment (type of radiation, any modifiers)
Calculations regarding the dose distributions
Evaluation planning
Error-free Answers.
Goal of radiation correct answers - to irradiate a predefined target volume while minimizing
exposure to adjacent normal tissues.
- Radiation oncologists and medical oncologists collaborate to determine overall goals and
treatment approaches.
- Multiple diagnostic procedures are employed to define the tumor volume and prescribe the
correct dose of radiation.
- Radiation physicists, dosimetrists, oncologists, and therapists use sophisticated hardware and
software to model geometric and dosimetric planning to ensure quality and accuracy.
dosimetrist correct answers part of radiation therapy team who calculates the absorbed dose of
radiation in matter and tissues
Successful treatment correct answers depends upon accurate writing and interpretation of the
radiation prescription.
treatment volume correct answers - the area that requires direct irradiation.
GTV - Gross tumor volume correct answers The visible tumor - the malignant growth that is felt
or seen on imaging
CTV - Clinical tumor volume correct answers The tissue that includes the GTV and the
microscopic malignant tissue
, PTV - Planning target volume correct answers The additional margins added to CTV to account
for the pt movement, tumor growth, and inaccuracies in calculations
treated volume correct answers the volume enclosed by an isodose surface that is determined by
the RO to be appropriate for the tx of this person and condition - 95% isodose surface
isodose correct answers radiation dose of equal intensity to more than one body area
irradiated volume correct answers the volume that receives a dose significant in relation to
normal tissue tolerance
Organs at risk (OARs) correct answers normal tissues whose radiosensitivity and location may
determine the course of treatment planning.
ICRU 50 - reference point correct answers the point that should be in the central part of the PTV.
It should be unambiguous, accurately determined, and clinically relevant.
Dose volume histograms (DVHs) correct answers complex models used in the reporting and
evaluating of 3D radiotherapy dose distribution
planning correct answers ensures the most accurate delivery of the most accurate dose, and
includes:
Determining patient positioning/immobilization to ensure consistent positioning throughout
treatment course
Data from computed tomography, magnetic resonance imaging, positron emission tomography,
and manual contouring
Definition of the treatment volumes and the OARs
The design of the treatment (type of radiation, any modifiers)
Calculations regarding the dose distributions
Evaluation planning
