Abstract
HDR endorectal brachytherapy (EBT) is an emerging alternative neoadjuvant treatment option for locally advanced rectal cancer. EBT is given in 4 fractions with daily dose of 6.5 Gy in four consecutive days. Reproducing planned applicator position relative to tumor location in each fraction is crucial for replicating dose distribution in this hypo-fractionated treatment regime. Radio-opaque markers are inserted into the patient prior to CT/MRI simulation to guide tumor delineation and treatment setup.
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