The Influence of Optical Body Surface Imaging on the Auxiliary Positioning Function and Positioning Accuracy in Breast Conserving Intensity Modulated Radiation Therapy
Objective To analyze the effect of optical surface imaging on the auxiliary positioning function and positioning accuracy in breast conserving intensity modulated radiation therapy.Methods With the selection of forty patients with breast cancer receiving IMRT in hospital from January 2021 to July 2023 as subjects,before each intensity modulated radiation therapy,the patient positioning was performed according to the marked line on the body surface,and auxiliary correction of positioning was performed by optical body surface detection system.Then,the positioning effect was verified through cone beam CT,and the bilateral and unilateral region of interest(ROI)of the patient were monitored based on the optical body surface.The treatment couch bed value corrected by the optical body surface detection system after positioning according to the marking line,and the body position error data verified by cone beam CT were recorded.Results The positioning errors of optical body surface imaging in the left and right(LR),anterior and posterior(AP),and superior-inferior(SI)directions were all less than the body surface marking lines(P<0.05).Compared to bilateral ROI,unilateral ROI has a greater error in the Roll and AP directions(P<0.05);However,there was no significant difference in the errors of LR,SI,Pitch,and Rtn directions between the unilateral ROI and the bilateral ROI(P>0.05).Conclusion Optical body surface imaging can improve the positioning accuracy of intensity modulated radiation therapy for breast cancer patients after breast conserving surgery,and bilateral ROI positioning accuracy is higher.
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