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目的：找出在注射标记抗体的荷瘤裸鼠体内的￣（９９ｍ）Ｔｃ注射剂量、时间与Ｔ／Ｎ比值的关系。方法：用γ计算机和γ计数器测定肿瘤和其它组织的放射性强度，计算Ｔ／Ｎ比值和定位指数ＬＩ．结果：（１）２ｍｃｉ的￣（９９ｍ）Ｔｃ剂量Ｔ／Ｎ比值高；（２）注射标记抗体２８ｈ后，Ｔ／Ｎ比值高，是放免显象的适宜６时间。结论：￣（９９ｍ）Ｔｃ剂量大小与Ｔ／Ｎ比值不呈线性关系，但Ｔ／Ｎ比值与定位指数呈正相关。
OBJECTIVE: To find out the dose and time of Tc-N ratio of 99m Tc injection into tumor-bearing nude mice injected with labeled antibody. Methods: Radioactivity of tumors and other tissues was measured by γ computer and γ counter, and T / N ratio and localization index LI were calculated. Results: (1) The T / N ratio of ~ (99m) Tc dose at 2mci was high; (2) The T / N ratio after 28h injection of labeled antibody was high, which was the appropriate time for radioimmunoimaging. CONCLUSION: There is no linear relationship between the dose of ~ (99m) Tc and the T / N ratio, but the T / N ratio is positively correlated with the localization index.