| 摘要: |
| 目的评价PROPELLER技术对磁共振弥散加权成像(DWI)中磁敏感伪影的改善。方法对40例含有金属义齿的志愿者颅底区域采用PROPELLER技术和平面回波成像(EPI)技术进行DWI成像。采用四点评分系统对图像质量进行评估,并对结果行ROC曲线分析。结果ROC曲线下面积(AUC)=0.979(P<0.01),表明金属义齿者颅底的PROPELLER DWI 成像技术与EPI DWI成像技术所产生的磁敏感伪影差异有统计学意义,前者能明显减少磁敏感伪影。结论 PROPELLER DWI成像技术能显著改善金属义齿所致的磁敏感伪影，利用ROC曲线可对图像质量的主观评价进行量化分析。 |
| 关键词: ROC曲线 周期性旋转重叠平行采集和增强重建 弥散加权成像 磁敏感伪影 |
| DOI：10.3724/SP.J.1008.2012.001383 |
| 投稿时间：2012-10-20修订日期：2012-11-10 |
| 基金项目: |
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| Performance of PROPELLER technique in reducing susceptibility artifacts in diffusion-weighted MR images |
| LIU Xiao-yan1,LIU Ting-ting1,WANG Jun2* |
(1. Department of Radiology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu, China
2. Department of Radiology, Nanjing General Hospital, PLA Nanjing Military Area Command, Nanjing 210002, Jiangsu, China
*Corresponding author.) |
| Abstract: |
| ObjectiveTo evaluate the performance of PROPELLER diffusion-weighted magnetic resonance image (DWI) in reducing image distortion caused by susceptibility artifacts. MethodsForty volunteers with metal denture were enrolled in the present study; their PROPELLER and echo-planar DWI were taken for the skull base. The quality of each image was evaluated by using a four-point scoring system. Qualitative comparison of image distortion between PROPELLER DWI and echo-planar DWI was performed by ROC analysis. ResultsThe area under the ROC curve was 0.979 (P<0.01), indicating a significant difference in the image distortion between PROPELLER DWI and echo-planar DWI. PROPELLER technique could greatly reduce the image distortion associated with magnetic susceptibility artifacts. ConclusionPROPELLER technique can greatly reduce metal denture-induced susceptibility-related image distortion, and ROC curve can be used for quantitative analysis of subjective assessment of image quality. |
| Key words: ROC curve periodically rotated overlapping parallel lines with enhanced reconstruction diffusion-weighted image magnetic susceptibility artifacts |
