Then, the gross tumor volume (GTV),clinical target volume (CTV) and planned target volume (PTV) were delineated on every section of the CT scans.

• 然后在所有CT层面逐层勾画出鼻咽肿瘤的大体肿瘤体积 (GTV)、临床靶体积 (CTV)和计划靶体积 (PTV)。