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:: Volume 15, Issue 3 (7-2017) ::
IJRR 2017, 15(3): 281-288 Back to browse issues page
Fewer beams and segments result in a shorter delivery time and a better quality intensity-modulated radiotherapy plan in gastric cancer
Y. Shen , X. Li , L. Liang , Y. Zhao , S. Bai , F. Xu Dr.
Department of Abdominal Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan Province, P.R. China , XF5780@163.com
Abstract:   (442 Views)
Background: This study evaluated whether IMRT using fewer beams and segments could reduce delivery time without compromising plan quality in gastric cancer adjuvant radiotherapy. Materials and Methods: Fifteen patients with advanced gastric cancer who underwent D2, R0 surgery were included in this study. IMRT plans for each patient were designed as 7 equal beams with 40 segments, 5 beams with 25 segments and 4 beams with 20 segments. The dosimetric parameters were compared for the planned target volume (PTV). The dose of normal organs at risk (OARs) was also assessed. The monitor units and treatment times of the different IMRT plans were calculated. Results: The 20-segment IMRT plan significantly reduced the PTV maximum dose compared to the 40-segment IMRT plan. The 20-segment IMRT plan improved left kidney and liver dose sparing in V20 and V30 as well as the 40-segment IMRT plan did and provided better protection for the V20 (13.86±7.78) of the right kidney, the V30 (9.25±4.04) of the left kidney, the D mean (19.68±2.47) of liver and D max (38.79±3.57) of the spinal cord. Irradiation times in the         20-segment and 25-segment plans decreased by 2.5 and 1.9 min, respectively, compared to the 40-segment IMRT plan. Conclusion: IMRT using fewer beams and segments reduced delivery time without compromising plan quality in gastric cancer adjuvant radiotherapy. Fewer segments IMRT plans lowered the monitor units and the treatment time.

 
Keywords: Beams and segments, intensity-modulated radiotherapy, plan quality, delivery time, gastric cancer.
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Type of Study: Original Research | Subject: Radiation Biology
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Shen Y, Li X, Liang L, Zhao Y, Bai S, Xu F. Fewer beams and segments result in a shorter delivery time and a better quality intensity-modulated radiotherapy plan in gastric cancer. IJRR. 2017; 15 (3) :281-288
URL: http://ijrr.com/article-1-2059-en.html
Volume 15, Issue 3 (7-2017) Back to browse issues page
International Journal of Radiation Research
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