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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