Abstract
Accounting for intrafraction motion is a critical element of breast radiation therapy to determine the treatment margin during partial breast irradiation and to reduce the toxicity to nearby critical structures such as heart, lung and ribs. Breast motion can be monitored using various methodologies, including optical or infrared tracking of individual markers placed on a patient's surface and 3D-video based optical surface imaging. Several institutions including our own have also employed implanted fiducial tracking using stereoscopic x-ray imaging on a robotic linac, using a module specifically designed to compensate for respiration induced tumor motion.
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