论文部分内容阅读
目的探讨计算机断层扫描(CT)扫描层厚对不同大小靶区勾画和肿瘤靶区体积(GTV)的影响。方法在Phlips CT模拟定位机上,应用层厚分别为2 mm、3 mm、5 mm的条件,分别对4个不同体积的人体等效组织的蜡块进行扫描,然后在Eclips(放疗模拟工作站)上逐层画出物体的外轮廓,利用工作站的统计功能计算出4个被测物体的体积。结果被测物体体积和物体体积大小误差与扫描层厚呈正比例关系。结论临床医生在确定临床靶区体积时,需要考虑到靶区体积与扫描层厚的厚度范围密切相关,差异变化程度与靶区体积大小呈负相关,靶区越小,差异变化程度越大,随着扫描层厚的变薄,扫描得到的靶区体积越接近实际的肿瘤体积。
Objective To investigate the effects of computed tomography (CT) thickness on the delineation and tumor target volume (GTV) of different size targets. Methods On the Phlips CT virtual positioning machine, four different volumes of human equivalent paraffin blocks were scanned under the conditions of layer thickness of 2 mm, 3 mm and 5 mm, respectively. Then, on the Eclips (radiotherapy simulation workstation) Draw the outer contour of the object layer by layer, using the statistical function of the workstation to calculate the volume of 4 measured objects. Results The measured object volume and object size error are directly proportional to the scan thickness. Conclusions Clinicians need to take into account that the volume of target volume is closely related to the range of the thickness of the scanning slice when determining the volume of clinical target volume. The degree of variation is negatively correlated with the volume of target volume. The smaller the target volume, the greater the degree of variation. With the thinning of the scan layer thickness, the volume of the target area scanned closer to the actual tumor volume.