扇形束计算机断层扫描在肺癌容积旋转调强计划精准治疗中的临床应用研究

Objective To explore the clinical application effect of fan-beam CT(FBCT) in the precise treatment of volume intensity modulated(VMAT) plan for lung cancer. Methods From October 2023 to September 2025, 30 patients in our hospital were selected as the research subjects, all of whom received VMAT. According to the CT scanning positioning methods, they were divided into two groups, namely, the observation group and the control group, with 15 cases in each group. The former was treated under the guidance of FBCT and the latter was treated under the guidance of cone-beam CT(CBCT). The target positioning error, dose coverage parameters of planned target area(PTV), conformity index(CI), uniformity index(HI) and time efficiency of the two groups were compared. Results The positioning errors of the observation group in X, Y and Z directions were significantly lower than those of the control group(P<0.05). The D95%, D98% and V100% in the observation group were significantly higher than those in the control group(P<0.05). CI in observation group was Higher than that in control group, and HI was lower than that in control group(P<0.05). The image scanning time in the observation group was longer than that in the control group, but the total setting time and image registration time were shorter than those in the control group(P<0.05). Conclusion FBCT guidance can significantly improve the target location accuracy and dose coverage accuracy of VMAT plan for lung cancer, and provide important technical support for clinical precision radiotherapy.