磁共振上腹部快速自动化增强扫描流程的初步研究

A Fast and Automatic Contrast-enhancement MR Workflow for Upper Abdominal Scan: A Preliminary Study

目的建立磁共振(MRI)上腹部快速自动化扫描方案,初步探究该扫描方案在3T MR系统上的可行性。方法设置MR上腹部扫描流程:包括定位像、冠状位T2加权成像、横断位T2加权成像、单次激发自旋回波扩散加权成像(DWI,b值1000s/mm^2)、同反相位兼DIXON T1 VIBE平扫及增强压脂T1 VIBE,并设置自动视野(FOV)定位、自动屏气提示及自动造影剂团注监测。前瞻性招募上腹部3T MRI增强扫描患者36名,行上腹部增强MR扫描,记录扫描时间,两位观察者利用两分法评价各序列图像诊断质量。结果所有参与者皆可按照自动屏气提示完成检查,自动造影剂团注监测方法可以有效监测造影剂到达主动脉时间,整个扫描方案的平均检查时间为12mins(16±70)s,两位观察者评价所有患者图像质量皆可用于临床诊断。结论本研究所提出的基于自动FOV定位、自动屏气提示及自动造影剂监测的3T上腹部快速自动化MR扫描方案可以用于临床。

Objective A fast and automatic contrast-enhancement MR workflow for upper abdominal scan was proposed and its feasibility was evaluated on a 3T scanner.Methods A MR workflow was set up for upper abdominal scan,including localizer,coronal T2WI,Transversal T2 WI,single-shot spin-echo DWI(b=1000s/mm2),T1 VIBE with 2 echoes and DIXON reconstruction,and contrast-enhanced T1 VIBE.Automatic FOV positioning,automatic voice command and automatic bolus detection were applied on this workflow.36 patients were prospectively enrolled in this study and underwent contrast enhanced MRI exam with the proposed workflow on abdomen.The exam duration of the whole workflow for every patient was recorded.Two radiologists assessed the image qualities with a two-category scale.Results All patients were able to complete the breath-hold exam under automatic-voice command.Automatic bolus detection could successfully catch the bolus on the aorta and triggered the next steps.The average exam duration of the whole workflow for all 36 patients is 12mins(16±70)s.Images of all study patients could be used for diagnosis.Conclusion The proposed automatic and fast MR workflow for upper abdomen scan can be used in clinical practices.