The impact of combined fixation with personalized lumbar cushions and body membranes on the positioning accuracy and stability of patients with cervical cancer undergoing radiotherapy

doi:10.11958/20252617

Abstract

Abstract:

Objective To explore the impact of personalized waist cushion combined with body membrane fixation on the positioning accuracy and stability in patients with cervical cancer radiotherapy. Methods A total of 72 cervical cancer radiotherapy patients were randomly divided into three groups: the experimental group, the control groupⅠand the control group Ⅱ, with 24 patients in each group. The experimental group used a personalized waist cushion combined with body membrane fixation, the control group Ⅰ used body membrane fixation, and the control group Ⅱ used a vacuum cushion. Cone-beam CT (CBCT) was used to measure the positioning errors of the three groups, and the positioning errors and coefficients of variation (CV) were compared between the three groups of patients. Results There were no significant differences in the X and Z-axis translational errors between the three groups. The Y-axis translational error was smaller in the experimental group than that in the control group Ⅰ and the control group Ⅱ. In terms of rotational errors, there were no significant differences in the Y and Z-axis rotational errors between the three groups, but the X-axis rotational error was smaller in the experimental group than that in the control group Ⅰ (P<0.05). Regarding the CV of positioning errors, the CV of X and Y-axis translational errors was smaller in the experimental group than that in the control group Ⅰ and the control group Ⅱ, and the CV of X-axis rotational error was smaller than that of the control group Ⅱ (P<0.05). Conclusion For patients with cervical cancer undergoing radiotherapy, the combined fixation of personalized waist cushion and body membrane can improve Y-axis positioning accuracy, reduce X-axis rotational errors and has better positioning stability.

Key words: uterine cervical neoplasms, radiotherapy, personalized lumbar cushions, body membranes, setup errors

CLC Number:

R737.33，R730.55

Figures/Tables 5

References 21

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组别	年龄/岁	膀胱尿量/mL	BMI/（kg/m²）
对照Ⅰ组	55.4±9.3	291.9±123.4	21.2（18.8，26.9）
对照Ⅱ组	52.8±11.0	226.2±128.0	21.4（19.0，26.3）
试验组	51.4±8.2	247.6±120.6	20.0（17.0，24.5）
F或H	1.045	1.753	2.410

组别	年龄/岁	膀胱尿量/mL	BMI/（kg/m²）
对照Ⅰ组	55.4±9.3	291.9±123.4	21.2（18.8，26.9）
对照Ⅱ组	52.8±11.0	226.2±128.0	21.4（19.0，26.3）
试验组	51.4±8.2	247.6±120.6	20.0（17.0，24.5）
F或H	1.045	1.753	2.410

组别	n	X轴	Y轴	Z轴
对照Ⅰ组	24	2.73±1.26	2.75±1.19	2.10±1.23
对照Ⅱ组	24	2.18±1.15	2.74±1.35	2.40±1.24
试验组	24	2.00±1.13	1.93±0.86^ab	1.69±1.09
F		2.443	4.724^＊	2.122

组别	n	X轴	Y轴	Z轴
对照Ⅰ组	24	2.73±1.26	2.75±1.19	2.10±1.23
对照Ⅱ组	24	2.18±1.15	2.74±1.35	2.40±1.24
试验组	24	2.00±1.13	1.93±0.86^ab	1.69±1.09
F		2.443	4.724^＊	2.122

组别	n	X轴	Y轴	Z轴
对照Ⅰ组	24	1.32±0.63	0.90±0.67	1.07±0.66
对照Ⅱ组	24	0.87±0.57	1.10±0.74	1.29±0.83
试验组	24	0.74±0.65^a	0.98±0.61	0.90±0.65
F		6.005^＊	0.493	1.834