Objective To understand the low concentration of positive contrast agent for the advantages of small bowel imaging applica-tions in MSCT,retrospective analysis of 108 cases using low concentration of contrast medium small bowel imaging,including clinical mani-festations,imaging examination. Method All patients adopt Siemens 16 row helical CT scan,the scan range from diaphragm to the pubic symphysis,scanning 16 mm × 1. 5 mm,with a thick layer of pitch of 1. 2,cross-sectional reconstruction image layer thickness 2 mm,re-construction interval was 1. 2 mm. Hollow block oral positive contrast agent,the 1500-2000 ml low concentration points time CT acquisition small intestine angiogram,according to the contrast agent arrived at ileocecus to evaluate the efficacy of the small intestine filling. Patients with abdominal scan,all parts plus enhanced scan. Results The patients with different clinical manifestations,the course of 3 days to 3 years. Abdominal pain,62 people,10 cases of abdominal tenderness,abdominal distension 40 people,diarrhea,5 people defecate character change 2 people,bloody 2 people,2 black,thin 2 people,3 touch the abdominal mass,abdominal ultrasound found 5 bag piece,2 lower ex-tremity edema. Duodenal polypus 2 people,2 small intestine mesenteric tumors,2 duodenal stenosis and obstruction,intestinal inflammation, 2 people,2 empty bowel wall thickening,2 loops of small intestine soft tissue mass,gastrointestinal stromal tumor three people,including one (5),and found that there are multiple lesions of the pancreatic head region soft tissue mass 2 people,3 colon polyps,2 cecum cancer,7 li-tres of colon,transverse colon,liver carcinoma 2,4 sigmoid colon cancer,rectal cancer,3 people,2 intussusception,1 person,poor bowel ro-tation in pelvic tumor 2 people,one person teratoma,appendix 3 people,2 hemorrhoids,2 lots of ascites. Conclusion Low concentration of contrast medium small bowel CT angiography in the diagnosis of small intestinal lesions in convenient,practical,can avoid common small bowel imaging intubation patients do the pain,can multiplanar reconstruction,three-dimensional imaging,image intuitive,can determine the location of the lesions and the scope of infringement,whether breakthrough serosa layer and involving the surrounding organs,abdominal cavity lymph node ever transfer,etc. ,has high diagnosis accuracy rate,it is worthy of wide use.%目的：了解低浓度阳性对比剂小肠造影在MSCT的应用优点，回顾性总结分析108例使用低浓度对比剂小肠造影病例，包括临床表现、影像学检查。方法：所有患者均采用西门子16排螺旋CT机扫描，扫描范围从膈顶到耻骨联合，扫描层厚16 mm ×1.5 mm，螺距1.2，横断面重建图像层厚2 mm，重建间隔1.2 mm。空腹分段口服1500~2000 ml低浓度阳性对比剂，分时间段CT采集小肠造影图像，根据对比剂到达回盲部来评价小肠充盈效果。全腹部平扫，部分患者加增强扫描。结果：患者临床表现各异，病程3 d~3年。腹痛62例，10例有腹部压痛，腹胀40例，腹泻5例，大便性状改变2例，便血2例，黑便2例，消瘦2例，摸到腹部肿块3例，B超发现腹部包块5例，下肢浮肿2例。结果：十二指肠息肉2例，小肠肠系膜肿瘤2例，十二指肠狭窄、半梗阻2例，小肠炎症2例，空肠壁增厚2例，小肠袢软组织肿物2例，胃肠间质瘤3例，其中1例发现有多个病灶（5个），胰头区软组织肿块2例，结肠息肉3例，盲肠癌2例，升结肠癌7例，横结肠肝曲癌2例，乙状结肠癌4例，直肠癌3例，肠套叠2例，中肠旋转不良1例，盆腔肿瘤2例（其中1例为畸胎瘤），阑尾术后3例，痔疮2例，大量腹水2例。结论：低浓度对比剂小肠CT造影对小肠病变的诊断方便、实用，能避免患者做普通小肠造影插管所带来的痛苦，可以多平面重建，三维成像，图像直观，可以判断病变的位置及侵犯范围，是否突破浆膜层及累及周围器官，腹腔淋巴结有否转移等，诊断准确率高，值得推广使用。
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