放射免疫显像技术对恶性肿瘤的定位诊断有独特的作用,但是由于放射性核素标记抗体除在肿瘤病灶显像外,标记抗体随着血液循环分布也会形成本底影像而掩盖肿瘤影像,因此,国外都采用“减本底技术”来提高肿瘤的清晰度。但是,“减本底技术”仅对已知肿瘤病灶的检测效果明显,如果肿瘤部位未知,就很难确认应对身体哪一部位的影像 Radioimmunoimaging imaging has a unique role in the localization diagnosis of malignant tumors. However, since radionuclide-labeled antibodies are displayed in tumor lesions, the distribution of labeled antibodies with the blood circulation will form a background image and mask the tumor image. In other countries, “reducing background technology” has been used to improve the clarity of tumors. However, the “basis reduction technique” has only a clear detection effect on known tumor lesions. If the tumor site is not known, it is difficult to identify which parts of the body are to be imaged.