低场强MR成像在胃癌诊断中的应用研究

目的：探讨低场强ＭＲ成像技术在胃癌诊断中的作用。材料与方法：５０例正常成人服用不同量的水和造影剂（Ｇｄ－ＤＴＰＡ）溶液、空气，注射或不注射低张药物后，进行多方位、多系列ＭＲ增强前后扫描以资对照。３０例进展期胃癌患者，空腹４￣８小时，检查前１０分钟肌注６５４－２ ２０ｍｇ，检查前即刻喝水６００￣１０００ｍｌ，行多方位、多系列增强前后扫描。１８例手术患者，术前进行ＴＮＭ分期和可切除性评估。结果：ＭＲＩ

The Value of Low Field MR Imaging in the Diagnosis of Gastric Carcinoma

Objective: To evaluate the low field MR imaging in diagnosing of gastric carcinoma. Materials and Methods: Multiplanar and multisequence MR scanning, before and after contrast enhanced, were performed in 50 normal subjects who took different volume of water, GdDTPA solution or air. The same MR scanning was conducted in 30 patients with advanced gastric cancer, who were fasted for 48 hours and given 20mg of 6542 ten minutes before study, and drank 6001,000ml water immediately before study. TNM staging and resectability evaluation were made in 18 patients before surgery. Results: Gastric anatomy was clearly demonstrated on MRI. The thickness of normal gastric wall was 46mm, showing homogeneous signal. The gastric wall presented isointensity signal on both T1WI and T2WI, a little highintensity signal on GRL and homogeneous enhanced after injection of contrast. The detecting rate of advanced gastric cancer was 100%. The accuracy of staging with MRI was 94.5%. The accuracy of preoperative evaluation for the resectability was 89%. Conclusion: MRI can well show the gastric wall thickness, anatomic structure and surrounding anatomy. For the advanced gastric cancer, MRI can demonstrate not only all its morphologic features, such as mass, thickened wall and invasion of adjacent organs, but also adenopathy, metastasis in abdominal cavity and viscera. MRI is very helpful in the diagnosis and staging of gastric