HASTE序列磁共振胰胆管成像:单层和多层法成像技术比较研究

目的　采用HASTE磁共振成像技术进行磁共振胰胆管成像并比较 2种不同成像方法优劣。方法　对 66例临床怀疑胰胆管病变患者进行磁共振检查 ,所有病例全部行胰胆系常规SE及梯度序列矢冠轴位相扫描和HASTE序列 2种不同方法 (多层薄块采集MIP重建法和连续单层厚块采集法 )MRCP成像。对 2种不同HASTE序列显示胰胆管病变的优缺点进行比较。结果　 66例中共有 44例确诊为胰胆系病变 ,阳性率 67% ( 4 4/ 66)。采用单层法 66例 ( 10 0 % )全部达到诊断标准 ;多层法有 5 8例 ( 88% )达到诊断标准。单层法采集空间分辨率较高 ,且采集时间短 ,但受血管伪影影响较明显。多层法采集密度分辨率高 ,但运动伪影明显。结论　单层采集HASTE屏气MRCP成像结合常规SE及梯度序列矢冠轴位相扫描是胰胆管病变磁共振检查的最佳方法之一

Half-Fourier Acquisition Single-shot Turbo Spin-echo (HASTE) Magnetic Resonance Cholangiopancreatography:Comparison Between Single-slice Acquisition Technique and Sequential Multislice Acquisition Technique

Objective Comparative study of two acquisition techniques of HASTE-MRCP, to optimize the best MRI examination method for diagnose the biliary tract diseases.Methods 66 patients(45 men and 21 women, mean age 52.7) were studied with a 1.0T super conductive unit(Magnetom Impact; Siemens, Germany) that used a body coil. Two acquisition techniques of HASTE- MRCP were used for all patients,that is single-slice acquisition with a slice thickness of 80 mm(single-slice technique) and sequential multislice acquisition with a 8 mm thickness(13 sections), followed by maximum intensity projection(MIP) reconstruction. The MRCP images were evaluated by two radiologists respectively.Results In our study, HASTE-MRCP could clearly depiect the morphological appearances of biliary diseases. The single-slice acquisition technique is better than sequential multislice acquisition technique,which postive rate were 100% and 88% respectirely.Single-slice acquisition have a high spatial resolution,and shot aquisition time,but more vessel artifact.Sequential multishce acquisition technique have high density resoultion,but more moving artifact.Conclusion The single-slice acquisition of HASTE-MRCP is an excellent technique in the diagnosis of biliary tract diseases.