Kouris K, Abdel-Dayem H M, Awdeh M
Nucl Med Commun. 1985 Nov;6(11):717-22. doi: 10.1097/00006231-198511000-00007.
99Tcm-DTPA has been evaluated in our clinical and experimental programme for the detection of acute gastrointestinal bleeding. As an adjunct to this programme, a protocol for image subtraction has been developed. The patient remains still while sequential static images I(i) (i = 1, . . ., N) are taken. They are first normalized to equal total counts and then subtracted images are produced according to the following three methods (a) I(i + 1)-I(i) (b) I(i) - I(mask) (c) I(mask) - I(i) where i not equal to mask and I(mask) denotes a user-selected mask image. Method (a) demonstrates fresh bleeding and sequential movement of blood in the bowel. Methods (b) and (c) demonstrate overall migration of blood and accumulated bleeding depending on the choice of the mask image.
我们在临床和实验项目中对99锝-二乙三胺五乙酸（99Tcm-DTPA）用于检测急性胃肠道出血进行了评估。作为该项目的辅助手段，已制定了图像减法协议。患者保持静止状态，同时拍摄序列静态图像I(i)（i = 1, …, N）。首先将它们归一化以使其总计数相等，然后根据以下三种方法生成减法图像：(a) I(i + 1)-I(i)；(b) I(i) - I(掩码)；(c) I(掩码) - I(i)，其中i不等于掩码，且I(掩码)表示用户选择的掩码图像。方法(a)显示肠道内新鲜出血和血液的连续移动。方法(b)和(c)根据掩码图像的选择显示血液的整体迁移和累积出血情况。
