|Table of Contents|

The three transverse planes position verification method for IMRT plans based on CT simulator and the analysis of its effect on reducing positioning errors

Journal Of Modern Oncology[ISSN:1672-4992/CN:61-1415/R]

Issue:
2023 23
Page:
4400-4404
Research Field:
Publishing date:

Info

Title:
The three transverse planes position verification method for IMRT plans based on CT simulator and the analysis of its effect on reducing positioning errors
Author(s):
XIAO Youli; ZHU Wanlin; CHEN Luqiao; NI Qianxi
Radiation Oncology Center,Hunan Cancer Hospital/The Affiliated Cancer Hospital of Xiangya School of Medicine,Central South University,Hunan Changsha 410013,China.
Keywords:
CT simulator; position verification; intensity modulated radiation therapy; positioning errors
PACS:
R730.55
DOI:
10.3969/j.issn.1672-4992.2023.23.019
Abstract:
Objective:To explore the establishment of a three transverse planes position verification method for IMRT plans based on CT simulator,and analyze the advantages of this method compared to the conventional single transverse plane position verification method based on CT simulator.Methods:90 patients with head-neck,and pelvis-abdominal tumors undergoing radiotherapy were randomly divided into two groups.Among them,44 were in the experimental group based on the three transverse planes position verification method of CT simulator,and 46 were in the control group based on the conventional single transverse plane position verification method of CT simulator.And perform CBCT position verification after radiotherapy positioning according to two different labeling methods.Record the linear displacement error of the patient's center point position in the three-dimensional direction of the X(left-right),Y(superior-inferior),and Z(anterior-posterior) axes during the radiotherapy process separately.Results:Considering the impact of different fixation methods on positioning errors in different parts of the body,divide the selected cases into two groups:pelvis-abdomen region and head-neck region for comparison.The displacement errors in the X,Y and Z axes of the pelvis-abdomen experimental group were (1.33±0.78),(1.87±0.94),and (1.26±0.87)mm.The displacement errors of the control group in three directions were (2.22±1.75),(3.23±2.38),and (1.70±1.30)mm.The positioning displacement errors in the X,Y and Z axes of the head-neck experimental group were ( 0.92±0.71),(1.11±0.86),and (0.86±0.73)mm.The displacement errors of the control group in three directions were(0.86±0.77),(1.34±1.21),and (1.08±0.87)mm.The results showed that there were statistically significant differences between the groups in the three directions of the pelvic and abdominal regions(all P＜0.05).There was no statistically significant difference between the two groups in the X and Y directions of the head and neck(P＞0.05),but there was a statistically significant difference between the two groups in the Z direction(P＜0.05).The mean positioning error of the improved position verification method was lower than that of the conventional position verification method.Conclusion:Compared to the conventional single transverse plane position verification method of CT simulator,the establishment of a three transverse planes position verification method for intensity modulated radiation therapy plan based on CT simulator,can effectively reduce positioning errors in three-dimensional positions for patients with pelvis-abdominal tumors.For head-neck patients,it can effectively reduce positioning errors in the Z directions,making the patient's radiation therapy more accurate.

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Memo

Memo:
湖南省卫生健康委科研基金资助项目(编号：202109031159)
Last Update: 2023-10-31