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ASRT Image Guided Radiation Therapy Overview With Questions And 100% SURE ANSWERS
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JACKLINEASRT Image Guided Radiation Therapy Overview With Questions And 100% SURE ANSWERS
Terms in this set (37)
What outcomes have been improved in radiation Reduced toxicity, better tumor control, and shorter fractionation schedules.
therapy practice with the use of image guided
radiation therapy?
The change in target position during treatment intrafraction
delivery. Example=thorax with respirations
The change in target position from one fraction to interfraction
another
Image guidance serves two distinct purposes, The primary function of IGRT is to keep the normal tissue tolerance dose lower than the lethal
which of the two purposes is the primary function dose to the tumor. This is done by frequently imaging the treatment volume during the course of
of IGRT? treatment, and decisions based on these images can more precisely guide dose delivery.
1. standard terminology 2. effective immobilization techniques and devices with online correction.
Successful implementation of IGRT includes what
3. a stringent quality assurance (QA) program. 4. A method to determine how and where to
four items?
document absorbed dose.
ASRT Image Guided Radiation Therapy Overview
1/5
, Report 50 of the International Commission of GTV, CTV, ITV, PTV, treated volume, irradiated volume
Radiation Units and Measurement (ICRU)has
define the volumes that must be considered when
planning a course of radiation treatment. Starting
from the smallest to the largest volume list
Consist of gross demonstrable tumor, including Gross tumor volume (GTV)
primary mass, and metastasis and
lymphadenopathy. Determined by visual or
palpable assessment and through diagnostic
imaging
Includes the demonstrable tumor and any area of Clinical target volume (CTV)
presumed malignancy. Represents the true extent
of the tumor location; no other cancerous cells
are identified or presumed to be outside this
volume
Compensates for any changes to the CTV during Internal target volume (ITV)
therapy due to physiologic movement and
variations in target position, shape, and size. This
volume includes the CTV and an internal margin
built into the plan
Includes the CTV and margins accounting for Planning target volume (PTV)
geometric uncertainties in treatment setup, beam
quality and consistency, and patient movement.
This volume also must represent the organs at risk,
emphasizing the need to minimize doses to these
areas.
Represents the minimum target dose that treated volume
adequately covers the PTV. Includes an additional
margin to cover limitations of the treatment
technique
The largest of all volumes, containing tissue that Irradiated volume
receives a significant amount of the prescribed
dose.
ASRT Image Guided Radiation Therapy Overview
2/5
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