Objective To explore the application value of the modified hypotonic method of intestinal system contrast ultra-sonography in elder patients with small intestinal diseases .Methods Group A were 28 patients with small intestine disease and 8 patients who was found abdominal mass suspected source of intestinal tumors by routine abdominal ultrasound inspection .We con-trast the mannitol intestinal system contrast ultrasound with modified hypotonic method of intestinal system ultrasound contrast , and compare with gastrointestinal ,gastrointestinal barium meal contrast ,then contrast the results of pathology .Group B were 37 patients ,with definite diagnosis with duodenal ulcers ,polyps ,the descending part of the diverticulum ,who respectively treated with drinking water method and modified hypotonic method of intestinal system ultrasound contrast ,then carry the two methods into comparison .Results The nidus detection increase from 9 to 12 in group A ;the nidus detection increase from 13 to 33 in group B . The modified hypotonic method of intestinal system contrast ultrasonography ,which eliminate intestinal gas more obvious and relax the intestinal lumen more sufficient than conventional contrast ,can improve the nidus detection rate .Conclusion The modified hy-potonic method of intestinal system contrast ultrasonography could be as a routine inspection method for elder small intestinal dis-ease paitents .%目的：探讨改良低张法肠系超声造影在老年小肠疾病患者检查中的应用价值。方法 A组为临床可疑28例小肠疾病患者和常规腹部超声检查可疑肠道肿瘤患者8例，行甘露醇法、低张法、改良低张法肠系超声造影对比。B组为37例经胃镜或X线钡餐造影确诊的十二指肠球部溃疡、息肉、降部憩室患者行饮水法、低张法、改良低张法肠系超声造影对比。结果 A组病灶检出从9例增加到12例，B组病灶检出率从13例提高到33例。改良低张法肠系超声造影比传统造影更加明显地消除肠道气体，更充分弛张肠腔，提高病灶检出率。结论改良低张法肠系超声造影可作为老年小肠疾病患者诊断的常规检查方法。
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