ABSTRACT
Image-guided radiation therapy (IGRT) utilizes knowledge of the target location and change in anatomy during treatment obtained through various imaging techniques to guide the radiation delivery. Particularly with advanced treatment delivery techniques such as intensity-modulated radiation therapy (IMRT) leads to high-precision dose sculpting with sharp dose gradients; it is critical to ensure the precision of the IGRT through carefully designed quality assurance (QA) procedures. In general, the QA of imaging modalities should include the following key components: imaging system performance, and geometric accuracy. The QA of imaging system performance typically includes the spatial integrity, noise, contrast, and high/low contrast resolution. The QA frequencies and action levels for the imaging modalities in an IGRT system have been recommended by multiple task groups. The chapter aims to identify the major characteristics of currently implemented or proposed motion-adaptive IGART procedures that would reasonably need to be QA-ed and to communicate efforts already published in the literature that have begun working toward that goal.
