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J Korean Soc Ther Radiol Oncol > Volume 16(1); 1998 > Article
The Journal of the Korean Society for Therapeutic Radiology and Oncology 1998;16(1): 63-69.
Efficacy of Small Bowel Displacement System in Post-Operative Pelvic Radiation Therapy of Rectal Cancer
Yong Chan Ahn, Do Hoon Lim, Moon Kyung Kim, Hong Gyun Wu, Dae Yong Kim, Seung Jae Huh
Department of Radiation Oncology, Samsung Medical Center, College of Medicine, Sung Kyun Kwan University, Seoul, Korea.
ABSTRACT
PURPOSE:
This study is to evaluate the efficacy of small bowel displacement system (SBDS) in post-operative pelvic radiation therapy (RT) of rectal cancer patients by measurement of small bowel volume included in the radiation fields receiving therapeutic dose. MATERIALS AND METHOD: Ten consecutive new rectal cancer patients referred to the department of Radiation Oncology of Samsung Medical Center in May of 1997 were included in this study. All patients were asked to drink Gastrographin before simulation and were laid prone for conventional simulation and CT scans with and without SBDS. The volume of opacified small bowel on CT scans, which was to be included in the radiation fields receiving therapeutic dose, was measured using picture archiving and communication system (PACS).
RESULTS:
The average small bowel volumes with and without SBDS were 176.0ml (5.2- 415.6ml) and 185.1ml (54.5- 434.2ml), respectively. The changes of small bowel volume with SBDS compared to those without SBDS were more than 10% decrease in three, less than 10% decreaseintwo,lessthan10%increaseinthree,andmorethan10%increaseintwopatients.
CONCLUSION:
No significant advantage of using SBDS in post-operative pelvic RT for rectal cancer patients has been shown by small bowel volume measurement using CT scan considering additional effort and time needed for simulation and treatment setup.
Key Words: Small bowel complication, Rectal cancer, Pelvic RT
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