Revealing sub-voxel motions of brain tissue using phase-based amplified MRI (aMRI)

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Itamar TeremSamantha J Holdsworth

Abstract

Amplified magnetic resonance imaging (aMRI) was recently introduced as a new brain motion detection and visualization method. The original aMRI approach used a video-processing algorithm, Eulerian video magnification (EVM), to amplify cardio-ballistic motion in retrospectively cardiac-gated MRI data. Here, we strive to improve aMRI by incorporating a phase-based motion amplification algorithm. Phase-based aMRI was developed and tested for correct implementation and ability to amplify sub-voxel motions using digital phantom simulations. The image quality of phase-based aMRI was compared with EVM-based aMRI in healthy volunteers at 3T, and its amplified motion characteristics were compared with phase-contrast MRI. Data were also acquired on a patient with Chiari I malformation, and qualitative displacement maps were produced using free form deformation (FFD) of the aMRI output. Phantom simulations showed that phase-based aMRI has a linear dependence of amplified displacement on true displacement. Amplification was independent of temporal frequency, varying phantom intensity, Rician noise, and partial volume effect. Phase-based aMRI supported larger amplification factors than EVM-based aMRI and was less sensitive to noise and arti...Continue Reading

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Citations

Feb 29, 2020·Journal of Biomechanical Engineering·Alireza MojahedAlexander F Vakakis
Jul 5, 2019·Nature Nanotechnology·Héctor Acarón LedesmaBozhi Tian
Nov 2, 2019·Journal of Magnetic Resonance Imaging : JMRI·Sarah AtwiBradley J MacIntosh
Sep 22, 2020·Brain Communications·Allen A ChampagneDouglas J Cook
Sep 4, 2019·Nature Biotechnology·Shaun R Patel, Charles M Lieber
Nov 30, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Stephan HahnThierry Metens
Sep 28, 2020·Ultrasound in Medicine & Biology·Poppy TurnerEmma M L Chung
Mar 24, 2021·Trends in Pharmacological Sciences·Ali MominXi Huang
May 6, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Itamar TeremSamantha J Holdsworth
Jul 17, 2021·Journal of the Mechanical Behavior of Biomedical Materials·E OzkayaM Kurt

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