Dosimetric differences in radiotherapy using wet gauze versus bolus for giant cell tumor of tendon sheath(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第6期
- Page:
- 680-684
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Dosimetric differences in radiotherapy using wet gauze versus bolus for giant cell tumor of tendon sheath
- Author(s):
- TIAN Xiumei1; SHEN Zhengwen1; DONG Wenling1; JIN Fu1; WU Furong1; XIA Xu 2
- 1. Department of Radiation Oncology, Chongqing University Cancer Hospital/Chongqing Cancer Institute/Chongqing Cancer Hospital, Chongqing 400030, China 2. Department of Oncology and Hematology, Traditional Chinese Medicine Hospital of Dianjiang County, Chongqing 408300, China
- Keywords:
- Keywords: giant cell tumor of tendon sheath wet gauze bolus dosimetry
- PACS:
- R312；R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.06.005
- Abstract:
- Abstract: Objective To investigate the dosimetric differences in the radiotherapy using wet gauze or bolus as tissue equivalent compensation for giant cell tumor of tendon sheath. Methods Eight patients with giant cell tumor of tendon sheath using wet gauze as tissue equivalent compensation were selected retrospectively. The original CT scan sequence was used as the first set of data, and the actual body (excluding gauze) was drawn manually. Then the virtual bolus was taken as tissue equivalent compensation to obtain the second set of data. Two groups of plans (Plan_gauze and Plan_bolus) were calculated in Varian Eclipse 13.6 to compare the dosimetric differences between two groups. Finally, two groups of phantoms were applied to measure the attenuation of the two kinds of tissue compensators to rays, and the differences between Plan_gauze and Plan_bolus were compared. Results No statistical difference was found between Plan_gauze and Plan_bolus in homogeneity index, conformity index, Dmax, Dmean, total monitor units, low dose area volume (V10, V20) and high dose area volume (V80, V90) (all P>0.05). Both groups met clinical requirements, and the experiments on two groups of phantoms showed that the differences in measured dose between Plan_gauze and Plan_bolus were trivial. Conclusion Similar dose distribution can be achieved by using wet gauze or virtual bolus as tissue compensation in the radiotherapy for giant cell tumor of tendon sheath. Considering the particularity of giant cell tumor of tendon sheath, wet gauze can be recommended as a tissue equivalent compensation for it can better cover the target area and reduce the cavity under tissue compensation, obtaining more accurate results.
Last Update: 2020-07-03