Impact of rectal gas on the planning target volume margin for pelvic bone and prostate matching in prostate cancer patients receiving volumetric-modulated arc therapy

We performed daily cone-beam computed tomography (CBCT) to determine the impact of rectal gas on the movements of prostate and seminal vesicles (SVs). We aimed to determine the relationship between planning target volume (PTV) margins and rectal gas. In 30 treatments of 15 prostate cancer patients, excessive rectal gas was removed and CBCT images were analyzed. Image registration between planning CT and daily CBCT images before and after rectal gas removal was performed for pelvic bone and prostate matching.

Source: Medical Dosimetry - April 18, 2023 Category: Radiology Authors: Yutaro Wada, Hajime Monzen, Naoko Ishida, Aritoshi Ri, Saori Tatsuno, Takuya Uehara, Masahiro Inada, Hiroshi Doi, Kiyoshi Nakamatsu, Makoto Hosono, Yasumasa Nishimura Source Type: research