MRI with TRELLIS: a novel approach to motion correction |
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Authors: | Maclaren Julian R Bones Philip J Millane R P Watts Richard |
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Institution: | aComputational Imaging Group, Department of Electrical and Computer Engineering, University of Canterbury, Christchurch, New Zealand |
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Abstract: | A motion-correcting pulse sequence and reconstruction algorithm, termed TRELLIS, is presented. k-Space is filled using orthogonal overlapping strips and the directions for phase- and frequency-encoding are alternated such that the frequency-encode direction always runs lengthwise along each strip. The overlap between strips is used both for signal averaging and to produce a system of equations that, when solved, quantifies the rotational and translational motion of the object. Results obtained from simulations with computer-generated phantoms, a purpose-built moving phantom, and in human subjects show the method is effective. TRELLIS offers some advantages over existing techniques in that k-space is sampled uniformly and all acquired data are used for both motion detection and image reconstruction. |
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Keywords: | MRI FSE Motion correction Artifacts |
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