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目的:研究螺旋CT之重建间隔对肿瘤靶区体积的影响。方法:在SiemensCT模拟机上以不同扫描层厚(5、8和10mm)相对应之不同重建间隔(2、3、5和8mm)对埋入蜡块中的圆柱体模型进行扫描获取图像,在治疗计划系统上勾画靶区并利用测量软件获得相应模体的体积数据。结果:随着扫描层厚的增加,其体积误差分别为(1.3±0.28)cm3、(1.5±0.26)cm3和(1.6±0.26)cm3;随着重建间隔的增加,其体积误差分别为(1.2±0.1)cm3、(1.3±0.14)cm3、(1.5±0.08)cm3和(1.73±0.03)cm3,且增大的数值均小于利用扫描层厚所测物体体积的误差,同时还发现,相同的扫描层厚与重建层厚相比,重建层厚所测之体积误差要比单纯扫描层厚所测之体积误差略小。结论:在螺旋CT模拟扫描中,采用薄层的重叠重建在肿瘤靶区体积的制定中是切实可行的。
Objective: To study the influence of reconstruction interval of spiral CT on tumor target volume. METHODS: Cylindrical models embedded in wax blocks were scanned on a Siemens CT simulator at different reconstructed intervals (2, 3, 5, and 8 mm) at different scan layer thicknesses (5, 8 and 10 mm) Plan the target system on the system and use measurement software to obtain the volume data of the corresponding phantom. Results: The volume errors were (1.3 ± 0.28) cm3, (1.5 ± 0.26) cm3 and (1.6 ± 0.26) cm3, respectively, with the increase of scan thickness. The volume errors of the scan layer were (1.2 ± 0.1 cm3, (1.3 ± 0.14) cm3, (1.5 ± 0.08) cm3 and (1.73 ± 0.03) cm3, respectively, and the increasing values were smaller than the errors of the volume of the object measured by the scanning layer thickness. At the same time, it was also found that the same Compared with the reconstructed layer thickness, the volume error of the reconstructed layer thickness is slightly smaller than that of the simple layer thickness. Conclusion: It is practicable to use thin overlap reconstruction in the development of tumor target volume in spiral CT simulation scan.