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Measurement of pulsatile motion with millisecond resolution by MRI.

Souchon, Rémi
Gennisson, Jean-Luc
Tanter, Mickael
Chapelon, Jean-Yves
Rouvière, Olivier
Published in Magnetic Resonance in Medicine. 2012, vol. 67, no. 6, p. 1787-93
Abstract We investigated a technique based on phase-contrast cine MRI combined with deconvolution of the phase shift waveforms to measure rapidly varying pulsatile motion waveforms. The technique does not require steady-state displacement during motion encoding. Simulations and experiments were performed in porcine liver samples in view of a specific application, namely the observation of transient displacements induced by acoustic radiation force. Simulations illustrate the advantages and shortcomings of the methods. For experimental validation, the waveforms were acquired with an ultrafast ultrasound scanner (Supersonic Imagine Aixplorer), and the rates of decay of the waveforms (relaxation time) were compared. With bipolar motion-encoding gradient of 8.4 ms, the method was able to measure displacement waveforms with a temporal resolution of 1 ms over a time course of 40 ms. Reasonable agreement was found between the rate of decay of the waveforms measured in ultrasound (2.8 ms) and in MRI (2.7-3.3 ms).
Keywords AlgorithmsAnimalsElastic Modulus/physiologyElasticity Imaging Techniques/methodsImage Enhancement/methodsImage Interpretation, Computer-Assisted/methodsLiver/physiologyMagnetic Resonance Imaging/methodsMovement/physiologyPulsatile Flow/physiologyReproducibility of ResultsSensitivity and SpecificitySwineViscosity
PMID: 22135014
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Research groups Imagerie et radiologie interventionnelle du foie, des voies biliaires et du pancréas (316)
Imagerie per-opératoire multi-modalité en radiologie interventionnelle (949)
Project FNS: CR33I3_143980
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SOUCHON, Rémi et al. Measurement of pulsatile motion with millisecond resolution by MRI. In: Magnetic Resonance in Medicine, 2012, vol. 67, n° 6, p. 1787-93. doi: 10.1002/mrm.23134 https://archive-ouverte.unige.ch/unige:43440

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Deposited on : 2014-12-15

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