(Saturday, 4/7/2018) 4:30 PM - 5:30 PM
Room: Marquis Ballroom 5-8
Image-guided radiotherapy (IGRT) is required for high-accuracy high-precision radiotherapy procedures and the incorporation of various imaging modalities into the treatment room has addressed and improved the geometrical uncertainty in radiation therapy. IGRT has greatly evolved in the last decades, and the spectrum of imaging modalities is increasing. It is a common practice to use more than one imaging modalities during the image-guided treatment so that patient setup performed with one image modality is validated by another. This quality assurance measure might pose challenges to clinical medical physicists when results from different imaging systems don’t agree with each other.
This session will focus on making effective clinical choices for IGRT. We will first give an overview of the most commonly used and the newest in-room IGRT modalities, such as simple orthogonal kV and, MV, CBCT, surface imaging, MV-CBCT, 4D-CBCT, and MRI. We will then specify appropriate uses for each modality, paying particular attention to the imaging in the treatment of moving tumors. This will be followed by a discussion of possible sources that might lead to conflicting instructions for guiding patient setup from different imaging systems. Real clinical examples will also be used to demonstrate how to troubleshoot when problems or unexpected results occur.
1. Understand the pros and cons of multi-modality IGRT.
2. Review different imaging for treatment verification approaches and image processing techniques commonly used by modern IGRT systems.
3. Learn about the clinical implementation of imaging systems for treatment verification.
4. Develop confidence in making proper clinical IGRT decisions based on results from multiple imaging modalities
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