| Abstract: | ObjectiveTo explore the positioning accuracy and application value of optical body surface tracking technology (OSMS) in precision radiotherapy for children's tumors.MethodsSix pediatric tumor patients were included. The body surface marking, laser light and optical surface tracking technology (OSMS) were applied to verified the patients pretreatment position, and perform CBCT scan before treatment after each positioning. The error of the left and right, head and foot, up and down directions of OSMS and CBCT were record. The χ2 test was used to compare the two groups to analyze the set-up error relationship between the two groups, and the Bland-Altman method was used to evaluate the consistency of the two systems. During treatment, the patient's posture changes were observed by OSMS monitors.ResultsThe movement errors of CBCT and OSMS in the left and right, head and foot, and up and down directions were: 0.207±0.076 cm, 0.207±0.073 cm; 0.186±0.072 cm, 0.183±0.069 cm; 0.206±0.068 cm, 0.198±0.071 cm, which had no significant difference (P>0.05). There were 4.65% (6/129), 5.43% (7/129), 3.88% (5/129) of movement differences between CBCT and OSMS in the left and right, head and foot, up and down directions Outside of 95% LoA. In the consistency range, the maximum absolute values of the differences were 0.06, 0.09, 0.11 cm, respectively.ConclusionOSMS is a high-precision and high-efficiency image guidance method, which can accurately reduce positioning errors and improve positioning efficiency. It is suitable for precise radiotherapy of childhood tumors. |
