Effect of bladder filling degree and different positions on OARs in post-operation radiotherapy for cervical cancer(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2021年第1期
- Page:
- 11-14
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Effect of bladder filling degree and different positions on OARs in post-operation radiotherapy for cervical cancer
- Author(s):
- ZHAO Yongliang; WU Jianting; JIN Jianhua; CHU kaiyue
- Department of Radiotherapy, Nantong Tumor Hospital, Nantong 226361, China
- Keywords:
- Keywords: cervical cancer bladder VMAT supine position prone position organs at risk
- PACS:
- R737.33；R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2021.01.003
- Abstract:
- Abstract: Objective To investigate the dosimetric effects of different bladder filling degree with different fixed positions on the organs at risk (OARs) of cervical cancer. Methods 86 cervical cancer patients who had accepted Volumetric Modulated Arc Therapy (VMAT) in Nantong City were retrospectively analyzed. Their bladders volume was measured by Treatment Planning System (TPS). The 86 patients were divided into two groups according to their different fixed positions (supine position and prone position), with each group 43 patients. V30, V40 and mean Dose Volume (Dmean) of the bladder, small intestine, rectum, sigmoid colon and colon in Dose Volume Histogram (DVH) were compared between the two groups of patients. A trend chart was generated from the collected data and the R square value of each trend line was read out. Results The differences in Dmean and V30 of bladder, small intestine, rectum, sigmoid colon and colon between the two groups were not statistically significant (P>0.05), while the differences in V40 of bladder, rectum, sigmoid colon and colon between the two groups were statistically significant (P<0.05). In prone position, the degree of bladder filling was proved highly fitted to the corresponding data of V30, V40 and Dmean of each organ at risk: with the increase of bladder volume, the corresponding data of each organ at risk decreased. Conclusion Prone position is better than supine position in the protection of organs at risk, and with the increase of bladder volume, the exposure dose for organs at risk will decrease.
Last Update: 2021-01-29