Propeller弥散加权成像技术在诊断急性脑梗塞中的应用

Improved Imaging Quality and Detection of Acute Cerebral Infarction with PROPELLER Diffusion Weighted MR Imaging

目的:探讨Propeller弥散加权成像技术在诊断急性脑梗塞中的应用价值。材料和方法:临床怀疑急性脑梗塞的123例患者,分别用Propeller DWI和常规EPI DWI做头颅MRI检查。由两名医师和一名技师共同读片并评价图像伪影和急性脑梗塞。对临床表现和病灶部位符合,DWI图像为高信号,相应部位ADC值降低,诊断为急性脑梗塞。结果:123例中,常规EPI DWI在颞叶、额叶、脑干和小脑出现伪影,分别为91例、43例、5例和7例;12例金属伪影。Propeller DWI在颞叶、额叶出现伪影,分别为2例和1例;无金属伪影。Propeller DWI检出全部77个急性脑梗塞灶,常规EPIDWI检出68个,漏诊9个。结论:Propeller DWI能够消除磁敏感性伪影,改善图像质量,提高病灶的检出率。

Purpose： To assess the value of propeller diffusion weighted imaging in defecting acute cerebral infarction lesions. Materials and Methods： One hundred twenty three patients who were suspected of having acute cerebral infarction underwent PROPELLER diffusion-weighted imaging and echo-planar diffusion-weighted imaging. Two radiologists and one technician compared these images for presence of artifacts, visualization of infarction lesions. Diagnosis criteria of acute cerebral infarction lesion ： clinical symptom and imaging display is identical, high signal on diffusion weighted imaging, and low apparent diffusion coeffcient value. Results： PROPELLER diffusion-weighted imaging reduced susceptibility artifact. In the temporal lobes, frontal lobes, brainstem and cerebellum, with echo-planar diffusion-weighted imaging, artifacts were present in 55, 33, 5 and 7 subjects of 123, respectively. Metallic artifact was present in 12 of 123. With PROPELLER diffusion-weighted imaging, in temporal lobes, frontal lobes, artifacts were present in 2, 1 of 123, respectively. No metallic artifact. Seventy-seven lesions of acute cerebral infarction were diagnosed with PROPELLER diffusion-weighted imaging. 68 of 77 lesions were diagnosed, 9 lesions were missed with echo-planar diffusion weighted imaging. Conclusion： PROPELLER diffusion weighted imaging dramatically reduced susceptibility artifact, offers better image quality and detects more acute cerebral infarction lesions than echo-planar diffusion weighted imaging