调强放疗靶区确定主要取决于大体肿瘤体积(GTV)的勾画,目前GTV勾画基于CT模拟定位扫描提供的形态学信息来实现。磁共振弥散加权成像(DWI)技术近几年来逐渐被用于肿瘤的早期诊断和临床分期,DWI采用反转恢复回波平面弥散序列,在抑制肌肉、脂肪等组织背景信号的基础上,突出病变区域的弥散加权对比,加之肿瘤组织及肿瘤细胞内水分子活动的狭小空间,使肿瘤组织中水分子弥散受限肿瘤呈高 IMRT target determination depends largely on the outline of the gross tumor volume (GTV), which is currently based on the morphological information provided by the CT simulated scans. Magnetic resonance diffusion-weighted imaging (DWI) technique has been gradually used in the early diagnosis and clinical stage of tumors in recent years. DWI uses reverse recovery echo plane dispersion sequence to highlight the lesion on the basis of inhibiting the background signal of muscle and fat tissue Diffusion-weighted regional contrast, combined with tumor tissue and tumor cells within the small space of water activity, so that the tumor tissue in water-restricted diffusion of tumor was high