|Table of Contents|

Comparison of the application of three postural fixation techniques in pelvic tumor radiotherapy based on CBCT

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

Issue:
2023 17
Page:
3237-3242
Research Field:
Publishing date:

Info

Title:
Comparison of the application of three postural fixation techniques in pelvic tumor radiotherapy based on CBCT
Author(s):
WANG Yuliu; FANG Yongwen; LIN Xiaosheng; YAO Wenyan; FANG Jianlan; XIAO Liangjie
Radiotherapy Department,Sun Yat-sen University Cancer Center,Guangdong Guangzhou 510060,China.
Keywords:
pelvic tumor; postural fixation; cone-beam CT; six-dimensional orientation
PACS:
R737.3
DOI:
10.3969/j.issn.1672-4992.2023.17.017
Abstract:
Objective:To compare the positional errors of three techniques of postural fixation in the six-dimensional direction in radiotherapy of pelvic tumor patients and to explore the ideal body position for radiotherapy of pelvic tumor patients for clinical reference.Methods:Patients with pelvic tumors treated with radiotherapy in our hospital from March 2019 to December 2021 were selected and divided into 3 groups according to different fixation techniques,including vacuum bag,orfit frame and modified individualized prone device,with 25 cases in each group,all of which were scanned by CBCT before radiotherapy,and the CBCT images were aligned bony with the planned CT images to obtain the positional errors in the head-foot direction(SI),left-right direction(LR),anterior-posterior direction(AP),rotation around Z axis(RTN),rotation around X axis(PITCH),rotation around Y axis(ROLL) in 6 directions,and the data were recorded by single ANOVA and Games-Howell(A) multiple comparisons.Results:The differences were statistically significant(P＜0.05) for the number of times the absolute value of linear error was >0.5 cm in all three groups.The differences were not statistically significant(P＞0.05) for the number of times the absolute value of rotation angle was >3° in all three groups.The differences were statistically significant(P＜0.05) when comparing the positional errors in the SI,LR and AP directions among the three groups.In the SI direction,group 2 was lower than group 1 and group 3.In the AP direction,group 1 was lower than group 2 and group 3.In the LR direction,group 3 was lower than group 1 and group 2.When comparing the three groups in the PITCH and ROLL directions,the differences were statistically significant(P＜0.05),and in the PICTH direction,there were differences between group 1 and group 2(P＜0.05).In the ROLL direction,there were differences between group 1 and group 2,group 2 and group 3(P＜0.001).Conclusion:In pelvic tumour radiotherapy,each of the three techniques of postural fixation has its own advantages.Compared to the orfit stand,the conventional vacuum bag and the modified individualised prone device reduce positional errors and improve the accuracy of radiotherapy in the LR,AP and ROLL directions,but the positional errors in the SI and PITCH directions need to be further improved.

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Memo

Memo:
广东省医学科学技术研究基金项目（编号：A2020621）
Last Update: 2023-07-31