论文部分内容阅读
目的:比较PROPELLE RFS EDWI和EPIDWI两种扩散加权成像序列,探讨PROPELLER技术在磁共振扩散加权成像中的应用价值。方法:选取67例临床疑诊急性脑梗塞的患者分别行PROPELLE RFS EDWI、EPIDWI和常规T1WI,T2WI,T2WI FLAIR序列检查,比较两种不同的弥散加权成像序列的图像质量,病灶检出率和对病变的显示程度。结果:67份EPIDWI图像均不同程度地存在磁化率伪影,PROPELLE RFS EDWI图像未见明显伪影及变形。67例患者中共发现并确诊46个急性脑梗塞灶(4例患者为颅内多发病灶),其中位于颅底区域的病灶12个,非颅底区域病灶34个。PROPELLE RFS EDWI和EPIDWI序列均可分辩出所有非颅底区域梗塞灶。对12个颅底病灶PROPELLE RFS EDWI序列检出率达100%,而EPIDWI序列可以明确诊断的7个,检出率为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16.7%。所有颅底区域病灶在EPIDWI序列上信噪比低于相应PROPELLE RFS EDWI序列上的信噪比(t=-2.874,P<0.05)。结论:PROPELLE RFS EDWI能有效提高图像信噪比,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 compare two PROPELLE RFS EDWI and EPIDWI diffusion-weighted imaging sequences to explore the value of PROPELLER in diffusion-weighted MR imaging. Methods: Sixty-seven patients with suspected acute cerebral infarction were examined with PROPELLE RFS EDWI, EPIDWI and routine T1WI, T2WI and T2WI FLAIR sequences respectively. The image quality, the detection rate of lesions and the contrast of two different DWI sequences were compared The extent of the lesion. Results: Magnetic susceptibility artifacts were found in 67 EPIDWI images, and no obvious artifacts and deformations were observed in PROPELLE RFS EDWI images. A total of 46 acute cerebral infarction cases were found and confirmed in 67 patients (4 with multiple intracranial lesions), including 12 in the skull base area and 34 in the non-skull base area. The PROPELLE RFS EDWI and EPIDWI sequences identify all non-skull base infarcts. In 12 skull base lesions, the detection rate of PROPELLE RFS EDWI sequence was 100%, while EPIDWI sequence could be diagnosed in 7 cases with a detection rate of 58.3%. Three lesions (25%) showed incomplete or deformity, missed diagnosis 2, missed diagnosis rate of 16.7%. The signal-to-noise ratio of all skull base lesions on the EPIDWI sequence was lower than that on the corresponding PROPELLE RFS EDWI sequence (t = -2.874, P <0.05). Conclusion: PROPELLE RFS EDWI can effectively improve the image signal-to-noise ratio, effectively eliminate the skull magnetic susceptibility artifacts, improve the image quality and improve the detection rate of skull base lesions.