Single-step nonlinear diffusion tensor estimation in the presence of microscopic and macroscopic motion.

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Murat AksoyRoland Bammer

Abstract

Patient motion can cause serious artifacts in diffusion tensor imaging (DTI), diminishing the reliability of the estimated diffusion tensor information. Studies in this field have so far been limited mainly to the correction of miniscule physiological motion. In order to correct for gross patient motion it is not sufficient to correct for misregistration between successive shots; the change in the diffusion-encoding direction must also be accounted for. This becomes particularly important for multishot sequences, whereby-in the presence of motion-each shot is encoded with a different diffusion weighting. In this study a general mathematical framework to correct for gross patient motion present in a multishot and multicoil DTI scan is presented. A signal model is presented that includes the effect of rotational and translational motion in the patient frame of reference. This model was used to create a nonlinear least-squares formulation, from which the diffusion tensors were obtained using a nonlinear conjugate gradient algorithm. Applications to both phantom simulations and in vivo studies showed that in the case of gross motion the proposed algorithm performs superiorly compared to conventional methods used for tensor estimation.

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Citations

May 27, 2011·Topics in Magnetic Resonance Imaging : TMRI·Derek K Jones
Dec 14, 2011·Topics in Magnetic Resonance Imaging : TMRI·Gregor KasprianDaniela Prayer
Mar 13, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Shayan GuhaniyogiNan-Kuei Chen
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Jun 16, 2009·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Shuzhou JiangJoseph V Hajnal
Mar 25, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Murat AksoyRoland Bammer
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Aug 10, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Murat AksoyRoland Bammer
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