MR螺旋桨扫描技术在消除伪影方面的临床应用  

Clinical application of MR PROPELLER technology in artifacts reduction

作　　者：戈明媚[1] 王秋良[1] 刘志钦[1] 刘晓林[1] 廖玉珍[1] 孙玮[2] 孙楠[2] 张英魁[2] 

机构地区：[1]北京军区总医院放射科,100700 [2]美国通用电气公司磁共振产品部

出　　处：《中华放射学杂志》2006年第2期208-212,共5页Chinese Journal of Radiology

摘　　要：目的探讨螺旋桨扫描技术(periodicallyrotatedoverlappingparallellinesenhancedreconstruction,PROPELLER)在临床的应用价值。方法对10例健康志愿者在头部晃动状态下、64例头颅MR检查中出现躁动不合作或口腔有固定金属异物的患者,应用PROPELLER技术进行T2WI和(或)扩散加权成像(DWI),与常规T2WI和(或)DWI进行对比。64例患者中,脑梗死40例(其中脑干梗死16例),脑梗死伴脑出血1例,脑转移瘤3例,癫痫、病毒性脑炎和高血压等20例。56例为运动伪影,8例为金属异物引起的磁敏感伪影。结果10例健康志愿者PROPELLERT2W图像质量明显优于常规T2WI。分别对10例志愿者和56例患者的常规T2WI、DWI与PROPELLERT2WI、DWI的图像进行比较,显示因运动产生的伪影,导致图像质量降低,无法达到诊断要求;采用PROPELLERT2WI,均显著消除伪影的影响,病变显示清晰,诊断明确。8例因固定义齿产生的磁敏感伪影,采用PROPELLERDWI,均明显消除伪影干扰,获得有诊断价值的图像。结论应用PROPELLERT2WI、DWI技术,明显消除患者因运动或金属异物造成的伪影,可生成高分辨率、无伪影、具有临床诊断意义的理想图像。Objective The aim of this study was to assess the clinical value of PROPELLER （periodically rotated overlapping parallel lines enhanced reconstruction, PROPELLER）. Methods Four sequences of conventionality and PROPELLER axial T2-weighted imaging （T2WI） and/or diffusion weighted imaging （DWI） were performed in ten normal volunteers with head ceaseless motion and 64 clinical subjects. Motion artifacts were observed in 56 patients in unconsciousness and magnetic-sensitive artifacts in other 8 patients with metallic implants. PROPELLER images and the conventionality images were compared. Results Sixty-four clinical subjects included the cerebral infarction （ n = 41 ）, brain metastasis （ n = 3 ） and others disorders （n = 20）. PROPELLER T2 WI had clearer and motion-artifact-free images in both volunteers and patients in unconsciousness. In dental treatment cases, magnetic-susceptibility artifacts were greatly reduced to an accepted level. Comparing with conventional sequences, PROPELLER T2WI/DWI sequences showed promising feature in reduction of artifacts and distinctly defined pathological profile. Conclusion MR PROPELLER technique offers a means of reducing motion and metallic artifacts, and improving image quality. Intracranial pathology is equally or better demonstrated with PROPELLER.

关 键 词：磁共振成像 图像处理 计算机辅助 对比研究 

分 类 号：R445.2[医药卫生—影像医学与核医学] R814.42[医药卫生—诊断学]