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脏器和肿瘤体积的精确测量对疾病的临床诊断及治疗效果的评价具有十分重要的意义。单光子发射型计算机断层摄影（ＳＰＥＣＴ）能显示人体内部组织的三维立体信息及断层图像，因而有可能为我们提供一种方便、精确、非创伤性的测量脏器和肿瘤体积的方法。其中，如何正确划定边
Accurate measurement of organ and tumor volume is of great importance to the clinical diagnosis of disease and evaluation of the therapeutic effect. Single-photon emission computed tomography (SPECT) can display three-dimensional information and tomographic images of the internal tissues of the human body and thus may provide us with a convenient, accurate and non-invasive method for measuring organ and tumor volume. Among them, how to correctly define the edge