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目的：探讨胃肠道出血核素显像的价值。材料和方法：回顾性分析了５２例胃肠道出血的９９ｍＴｃ－ＲＢＣ核素显像检查，常规作体内标记法，先作动态血流灌注显像，然后于注射后１０，２０，３０ｍｉｎ，１和２ｈ作静态显像，自１９９９年２月开始加作２４ｈ延迟显像。结果：（１）５２例核素显像的阳性率为５３．８％（２８／５２），定位准确率为８２．１％（２３／２８）。（２）５２例中，血流灌注动态显像早期以及静态显像的定位准确率分别是９４．１％（１６／１７）和７２．２％（１３／１８）；１１例２４ｈ的延迟显像中，发现出血者７例，定位准确者４例。（３）２２例阳性显像中，大便隐血（ＯＢ）试验阴性７例，阳性３例，强阳性１２例；阴性显像 １４例中， ＯＢ阴性 １１例，强阳性３例。（４）核素显像阳性与ＢＵＮ／Ｃｒ阳性之间未见相关性。结论二为了提高９９ｍＴｃ－ＲＢＣ显像对小肠出血点定位的灵敏度和准确性，应注意观察早期动态血流灌注显像和一系列静态显像。对于出血的预测，显像前的大便隐血试验、ＢＵＮ／Ｃｒ不如核素显像准确。
Objective: To investigate the value of imaging of radionuclides in gastrointestinal tract. Materials and Methods: A retrospective analysis of 52 cases of gastrointestinal bleeding 99mTc-RBC nuclide imaging, routine for in vivo marker method, first for dynamic perfusion imaging, and then at 10,20,30 min, 1 And 2h for static imaging, since February 1999 plus 24h delayed imaging. Results: (1) The positive rate of 52 cases of radionuclide imaging was 53.8% (28/52), and the accuracy of localization was 82.1% (23/28). (2) In 52 cases, the accuracy of perfusion dynamic imaging in early and static imaging were 94.1% (16/17) and 72.2% (13/18), respectively; Like, found in 7 cases of bleeding, accurate positioning in 4 cases. (3) In 22 cases of positive imaging, the stool obstructing blood (OB) test was negative in 7 cases, positive in 3 cases and strong positive in 12 cases. Among the 14 cases of negative imaging, OB was negative in 11 cases and strong positive in 3 cases. (4) No correlation was found between nuclide imaging positive and BUN / Cr positivity. Conclusion In order to improve the sensitivity and accuracy of 99mTc-RBC imaging for the location of small intestinal bleeding, early dynamic perfusion imaging and a series of static imaging should be observed. For the prediction of bleeding, stool occult blood test before imaging, BUN / Cr as nuclide imaging accuracy.