Image-based ghost correction for interleaved EPI
نویسندگان
چکیده
منابع مشابه
Image-based ghost correction for interleaved EPI.
A new image-based ghost correction technique is described for general interleaved EPI. This technique works reliably with both even- and odd-number interleaved EPI sequences. It estimates the phase distortions causing the ghosts as a general function of (x,y) even in the presence of a significant overlap of parent image and ghosts. If the phase distortion is assumed to be a function of x (frequ...
متن کاملImage-based ghost correction for general interleaved EPI
Introduction A new image-based ghost correction technique is described for general interleaved EPI. It estimates the phase distortions causing the ghosts as a general function of (x,y), even in the presence of significant overlap of parent image and ghosts. If the phase distortion is assumed to be a function of x (frequency encode direction) only, the new technique is similar to a recently publ...
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Abstract. We describe an iterative algorithm for reducing EPI ghost artifacts using image-based phase corrections. Ghosts outside the parent object are set to the background level and a model k-space is obtained from the Fourier transform of the resulting image. The phase offsets in each k-space line are estimated by comparison with the corresponding line in the model k-space. We hypothesise th...
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Introduction: An important step in the reconstruction of an EPI scan is the phase correction between the odd and even lines to reduce the Nyquist ghost. Typically, the correction is performed for each channel, slice, and repetition of a data set separately. We propose a phase correction technique, which determines the phase correction differences between channels and slices with high accuracy i...
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PURPOSE A ghost correction strategy for Simultaneous Multi-Slice (SMS) EPI methods that provides improved ghosting artifact reduction compared to conventional methods is presented. Conventional Nyquist ghost correction methods for SMS-EPI rely on navigator data that contain phase errors from all slices in the simultaneously acquired slice-group. These navigator data may contain spatially nonlin...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2001
ISSN: 0740-3194,1522-2594
DOI: 10.1002/1522-2594(200101)45:1<96::aid-mrm1014>3.0.co;2-j