(Saturday, 4/4/2020) 2:00 PM - 4:00 PM [Mountain Time (GMT-6)]
Image guided radiation therapy (IGRT) has become the standard of care in radiotherapy. During a daily
treatment delivery, the patient may be imaged more than once in order to position and to confirm alignment after repositioning. These x-ray imaging procedures expose additional dose to healthy organs outside targets.
Understanding the magnitude of the image dose and its risks become increasingly important. The AAPM reports, TG-75 and TG-180, were developed to provide guidelines and strategies for minimizing imaging
dose. This lecture gives an overview of the AAPM TG-180 report as well as the recommendations for
managing image guidance doses. The rationale of the recommended threshold beyond which
imaging dose should be considered in the treatment planning process will be discussed. Two recommended
methods of estimating patient imaging dose during treatment planning will be explained. In addition to list typical organ doses resulting from a variety of currently image acquisition procedures, this session discusses the projected risk of cancers possibly induced by the dose level reported for imaging procedures compared to diagnostic imaging procedures.
The session will also provide available techniques that can be used in clinical practice to manage imaging dose.
Learning objectives:
1. Learn typical organ doses resulting from different imaging procedures and image
guidance modalities.
2. Understand the imaging dose threshold and methods to account for the imaging dose.
3. Gain the knowledge in the projected risk of cancers possibly induced by the dose level reported
for imaging procedures.
4. Learn available techniques to reduce the imaging dose in clinical practice.
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