基于敏感编码技术磁共振水成像在胃肠道检查中的应用

目的探讨基于敏感编码(SENSE)技术单次激发放射状水成像技术对正常胃肠道解剖结构的显示能力,为水成像技术诊断胃肠道疾病提供正常解剖学基础,并探讨胃肠道疾病的影像学诊断新方法。方法健康自愿者共30例,其中男性19例,女性11例,年龄20-50岁,中位年龄35岁。检查前60 min口服饮用水1 000-1 500 mL,检查前20 min再口服500 mL,扫描前10 min肌注654-2 10 mg。MR水成像(MRH)检查使用PhilipsGyroscan Intera 1.5T超导型MRI,采用SENSE技术相匹配的相控阵线圈及呼吸门控,行单次激发放射状快速自旋回波序列进行胃肠道水成像检查。结果30例均能接受此检查,检查成功率100%。30例水成像图像经盲法评价,优良图像占93%,差图像占7%。其中胃显示率65%,胃黏膜显示清楚占80%;十二指肠显示率80%,空肠显示率59%,空肠直径2-2.5 cm,回肠显示率21%,回肠直径1.5-2.5 cm,小肠黏膜清楚显示占67%;结肠显示率10%,结肠黏膜清楚显示占6%。结论基于SENSE技术单次激发放射状水成像技术对胃、十二指肠及空肠轮廓和黏膜皱襞显示较为清楚,对回肠及结肠轮廓和黏膜皱襞显示较差。单次激发放射状水成像技术结合常规腹部MR检查可以清楚、方便地显示胃肠道的解剖特点,是胃肠道影像学检查的一种新的可供选择的方法。

Application of simple-shot-radio (SSH/RAD) MR hydrography (MRH) based on SENSE in gastrointestinal tract examination

Objective To evaluate the capability of SSH/RAD MRH based on SENSE to show gastrointestinal tract anatomic structure,to provide normal anatomic base for gastrointestinal tract disease diagnosis with SSH/RAD MRH and to explore the new examination method for imaging diagnosis in gastrointestinal tract disease.Methods There were 30 healthy volunteers in total including 19 male cases,11 female cases,the age ranging from 20 to 50 with the mean age as 35 year old.All volunteers were asked to drink tap water about 1000-1500mL continuously at 60 minute before examination,to drink tap water 500mL at 20 minute before examination and receive injection of 654-2 10mg in muscle at 10min before examination.MRH were performed by Philips Gyroscan Intera 1.5T superconduct MRI scanner,using SENSE technique,phased-array coil and breath hold.SSH/RAD MRH was performed after the routine abdominal MR scan was done.Results SSH/RAD MRH was successfully performed on all volunteers at one time,and the examination achievement ratio was 100%.All images were evaluated by two senior doctors using blindness method.The ratio of the good-optimal quality images was 93% and the poor-quality images was 7%.Of all images,the stomach manifestation ratio was 65%,the stomach mucous clear manifestation ratio was 80%,the duodenum manifestation ratio was 80%,the jejunum manifestation ratio was 59%,the jejunum diameter was 2-2.5cm,the ileum manifestation ratio was 21%,the ileum diameter was 1.5-2.5cm and the small intestinal mucous clear manifestation ratio was 67%;the colon manifestation ratio was 10% and the colon mucous clear manifestation was 6%.Conclusion SSH/RAD MRH based on SENSE can clearly show the outline and mucous of the stomach,duodenum and jejunum,but can not clearly show the outline and mucous of ileum and colon.The imaging examination that the colon SSH/RAD MRH combined with the routine abdominal MR scan could clearly and conveniently show the anatomical characteristics of gastrointestinal tract.It is a new imaging examination method for gastrointestinal tract examination.