ASRT Image Guided Radiation Therapy Overview Questions and Answers
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Course
ASRT
Institution
ASRT
ASRT Image Guided Radiation Therapy Overview Questions and Answers
What outcomes have been improved in radiation therapy practice with the use of image guided radiation therapy?
Reduced toxicity, better tumor control, and shorter fractionation schedules.
The change in target position durin...
ASRT Image Guided Radiation Therapy
Overview Questions and Answers
What outcomes have been improved in radiation therapy practice with the use of image
guided radiation therapy? - answer Reduced toxicity, better tumor control, and
shorter fractionation schedules.
The change in target position during treatment delivery. Example=thorax with
respirations - answer intrafraction
The change in target position from one fraction to another - answer interfraction
Image guidance serves two distinct purposes, which of the two purposes is the primary
function of IGRT? - answer The primary function of IGRT is to keep the normal tissue
tolerance dose lower than the lethal dose to the tumor. This is done by frequently
imaging the treatment volume during the course of treatment, and decisions based on
these images can more precisely guide dose delivery.
Successful implementation of IGRT includes what four items? - answer 1. standard
terminology 2. effective immobilization techniques and devices with online correction. 3.
a stringent quality assurance (QA) program. 4. A method to determine how and where
to document absorbed dose.
Report 50 of the International Commission of 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 - answer
GTV, CTV, ITV, PTV, treated volume, irradiated volume
Consist of gross demonstrable tumor, including primary mass, and metastasis and
lymphadenopathy. Determined by visual or palpable assessment and through
diagnostic imaging - answer Gross tumor volume (GTV)
Includes the demonstrable tumor and any area of presumed malignancy. Represents
the true extent of the tumor location; no other cancerous cells are identified or
presumed to be outside this volume - answer Clinical target volume (CTV)
Compensates for any changes to the CTV during 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 - answer Internal target volume (ITV)
Includes the CTV and margins accounting for geometric uncertainties in treatment
setup, beam quality and consistency, and patient movement. This volume also must
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