Study on effectiveness of radiotherapy line image guidance for dose-error correction in patients with abdominal tumor
10.7687/j.issn1003-8868.2018.02.060
- VernacularTitle:腹部肿瘤患者放疗行图像引导对剂量误差纠正的有效性研究
- Author:
Wei XU
1
;
Zhong-Jian JU
;
Xiao-Shen WANG
;
Wei HAN
;
Ming-Yang ZHANG
;
Pei-Yuan JIANG
;
Ying GANG
Author Information
1. 解放军总医院放射治疗科
- Keywords:
abdominal tumor;
cone beam CT;
image guidance;
setup error;
radiotherapy
- From:
Chinese Medical Equipment Journal
2018;39(2):60-64
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effect of the correction of the position error of the abdominal tumor by cone beam scanning. Methods Six patients with abdominal tumor were selected with double-blind method, and electronical portal imaing device was used to collect the information of the patient dosimetry during radiotherapy.EDOSE tool was applied to 3D dose reconstruction so as to execute real-time 3D dose verification of the treatment plan. Each patient had 5 sets of data acquired when image guidance existed and another 5 sets when image guidance was absent. The treatment effects with or without image guidance were compared.Results The overall γ passing rate with cone beam CT image guidance gained no advantages over that without image guidance, though the setup error was corrected to some extent. Image guidance contributed nothing to increasing target area coverage while decreasing exposure dose to normal tissue. Conclusion Setup error correction by the image guidance based on bone marker has no significant effect on improving 3D dose verification and dose accuracy during the radiotherapy of the abdominal tumor patient.
