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Interleaved echo planar imaging on a standard MRI system

 

作者: Kim Butts,   Stephen J. Riederer,   Richard L. Ehman,   Richard M. Thompson,   Clifford R. Jack,  

 

期刊: Magnetic Resonance in Medicine  (WILEY Available online 1994)
卷期: Volume 31, issue 1  

页码: 67-72

 

ISSN:0740-3194

 

年代: 1994

 

DOI:10.1002/mrm.1910310111

 

出版商: Wiley Subscription Services, Inc., A Wiley Company

 

关键词: echo planar;fast scanning

 

数据来源: WILEY

 

摘要:

AbstractThis work describes an interleaved echo planar imaging (EPI) method for use on a standard whole body scanner. The data acquisition is divided into two to eight repetitions rather than one to two, as implemented by dedicated EPI systems. Interleaving allows the use of a lower sampling bandwidth with a significant increase in signal‐to‐noise. The method also has the advantages of relative ease of implementation, no need for postprocessing to remove image distortion, and no need for shimming on a case‐by‐case basis. The interleaved EPI method was applied to two applications ideally suited to EPI: breathhold T2‐weighted abdominal imaging and functional imaging.In vivoliver‐lesion contrast as measured in a 35‐patient study showed increased contrast for the Interleaved EPI by an average factor of 1.21 (± 0.34) over conventional spin‐echo imaging. CNR measurements showed the EPI to be comparable with conventional spin echo with a relative factor of 1.00 (± 0.36). Functional imaging with an eight‐shot interleaved EPI sequence provided 128 × 128 images of cerebral activation during bila

 

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