摘要
目的比较螺旋桨扫描技术(PROPELLER FSE)和平面回波成像(EPI)两种扩散加权成像(DWI)序列,探讨PROPELLER技术在DWI的应用价值。资料与方法选取67例临床疑诊急性脑梗死的患者分别行PROPEL-LER FSE DWI、EPI DWI和常规T1WI、T2WI、T2WI液体衰减反转恢复序列(FLAIR)检查,比较两种不同的DWI序列的图像质量,病灶检出率和对病变的显示程度。结果67例EPI DWI图像均不同程度地存在磁化率伪影,67例PROPELLER FSE DWI图像未见明显伪影及变形。67例中共发现并确诊46个急性脑梗死灶(4例为颅内多发病灶),其中病灶位于颅底区域12个,非颅底区域34个。PROPELLER FSE DWI和EPI DWI均可分辩出所有非颅底区域梗死灶。对12个颅底病灶PROPELLER FSE DWI检出率达100%,而EPI DWI可以明确诊断的7个,检出率达58.3%,病灶形态显示不充分或变形者3个,占25%,漏诊2个,漏诊率为16.7%。所有颅底区域病灶EPI DWI上信噪比(SNR)低于相应PROPELLER FSE DWI的SNR(t=-2.874,P<0.05)。结论PROPELLER FSE DWI能提高图像SNR,有效消除颅底磁化率伪影,改善图像质量,提高颅底病变的检出率。
Objective To evaluate the diagnostic value of rotated overlapping parallel lines with enhanced reconstruction （PROPELLER） multi-shot fast spin-echo （FSE） and single-shot echo-planar （EPI） diffusion-weighted MR imaging in hyperacute and acute cerebral infarction. Materials and Methods 67 cases who were suspected of acute cerebral infarc- tion were performed with PROPELLER and echo -planar diffusion-weighted MR imaging as well as T1WI, T2WI, T2WI- FLAIR. Image quality and visualization of acute cerebral infarction were compared. Results PROPELLER MR imaging had no obvious susceptibility artifacts in 67 cases, but EPI diffusion-weighted MR imaging had different degree of susceptibility artifacts near the skull base or the frontal sinuses ,such as temporal , frontal , parietal lobes , cerebellum and brainstem . Of the 67 cases ,46 acute infarction lesions were found, 12 lesions located near the skull base or the frontal sinuses, which were clearly demonstrated by PROPELLER MR imaging, 7 were demonstrated clearly at EPI DWI（58.3% ） , 3 were depicted indefinitely by EPI DWI（25% ） , and 2 were missed by EPI DWI（ 16.7% ）. The signal-to-noise ratio lesions were higher at PROPELLER MR imaging （ t = - 2.874 ,P 〈 0.05 ）. While the other 34 lesions beyond the area of the skull base or the frontal sinuses were clearly demonstrated by both EPI DWI and PROPELLER FSE DWI. Conclusion PROPEL- LER FSE DWI imaging offers better image quality and detection of acute cerebral infarction than that of echo - planar MR imaging, especially in the part of the brain located near the skull base or the frontal sinuses.
出处
《临床放射学杂志》
CSCD
北大核心
2007年第11期1071-1075,共5页
Journal of Clinical Radiology
基金
福建省自然科学基金计划资助项目(编号:2006J0371)
关键词
急性脑梗死
磁共振成像
扩散加权成像
螺旋桨技术
Acute cerebral infarction Magnetic resonance imaging Diffusion weighted imaging
