Diffusion imaging changes in the treated tract following focused ultrasound thalamotomy for tremor

We describe diffusion tensor imaging metrics of brain microstructure changes following magnetic resonance guided focused ultrasound (MRgFUS) ablation of the ventral intermediate nucleus of the thalamus for the treatment of tremor in order to explore the mechanisms of tremor reduction post-MRgFUS. Tr...

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Main Authors: Erin L. Mazerolle, Robyn Warwaruk-Rogers, Paul Romo, Tejas Sankar, Sarah Scott, Conrad P. Rockel, Samuel Pichardo, Davide Martino, Zelma H.T. Kiss, G. Bruce Pike
Format: Article
Language:English
Published: Elsevier 2021-03-01
Series:NeuroImage: Reports
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Online Access:http://www.sciencedirect.com/science/article/pii/S2666956021000088
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author Erin L. Mazerolle
Robyn Warwaruk-Rogers
Paul Romo
Tejas Sankar
Sarah Scott
Conrad P. Rockel
Samuel Pichardo
Davide Martino
Zelma H.T. Kiss
G. Bruce Pike
author_facet Erin L. Mazerolle
Robyn Warwaruk-Rogers
Paul Romo
Tejas Sankar
Sarah Scott
Conrad P. Rockel
Samuel Pichardo
Davide Martino
Zelma H.T. Kiss
G. Bruce Pike
author_sort Erin L. Mazerolle
collection DOAJ
description We describe diffusion tensor imaging metrics of brain microstructure changes following magnetic resonance guided focused ultrasound (MRgFUS) ablation of the ventral intermediate nucleus of the thalamus for the treatment of tremor in order to explore the mechanisms of tremor reduction post-MRgFUS. Tractography was performed on pre-treatment images to identify the portion of the dentato-rubro-thalamo-cortical tract (DRTT) intersecting the MRgFUS thalamotomy lesions in 17 essential tremor patients. The resulting tract was divided into regions of interest (ROI), which were then analyzed on pre-, one day post-, and three months post-treatment scans. Fractional anisotropy (FA), and mean, axial, and radial diffusivity (MD, AD, and RD) were computed in each ROI at each time point. At both one day and three months post-treatment, we observed decreased FA and increased MD and RD in the section of the treated tract between the lesion and cortex. At three months post-treatment, we additionally observed increased AD in the section between the lesion and cortex, and decreased FA in the section between the dentate nucleus and the decussation of the superior cerebellar peduncles. Diffusion changes at one day post-treatment may reflect local, acute effects such as inflammation and edema, as opposed to chronic degenerative processes such as axonal degeneration and myelin loss that would be expected at later time points. No significant correlations were detected between diffusion measures and clinical effects, suggesting that microstructural changes in the treated portion of the DRTT alone do not fully explain tremor reduction and motivating additional research using higher spatial resolution diffusion imaging and multimodal approaches such as integrating diffusion and functional magnetic resonance imaging data. Our individualized approach, in which patient-specific lesions are incorporated into the tractography analysis, provided novel insight into both immediate and longer term MRgFUS-related microstructural brain changes.
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spelling doaj-art-e2a51d10a21242f09108a278201b26d22025-08-20T02:04:17ZengElsevierNeuroImage: Reports2666-95602021-03-011110001010.1016/j.ynirp.2021.100010Diffusion imaging changes in the treated tract following focused ultrasound thalamotomy for tremorErin L. Mazerolle0Robyn Warwaruk-Rogers1Paul Romo2Tejas Sankar3Sarah Scott4Conrad P. Rockel5Samuel Pichardo6Davide Martino7Zelma H.T. Kiss8G. Bruce Pike9Department of Radiology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada; Corresponding author. Department of Psychology, St. Francis Xavier University, Antigonish, Nova Scotia, Canada.Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, CanadaSeaman Family MR Research Centre, Foothills Hospital, Calgary, Alberta, CanadaDivision of Neurosurgery, Department of Surgery, University of Alberta, Edmonton, Alberta, CanadaDepartment of Radiology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, CanadaDepartment of Radiology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, CanadaDepartment of Radiology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada; Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada; Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, CanadaHotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada; Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, CanadaHotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada; Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, CanadaDepartment of Radiology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada; Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada; Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, CanadaWe describe diffusion tensor imaging metrics of brain microstructure changes following magnetic resonance guided focused ultrasound (MRgFUS) ablation of the ventral intermediate nucleus of the thalamus for the treatment of tremor in order to explore the mechanisms of tremor reduction post-MRgFUS. Tractography was performed on pre-treatment images to identify the portion of the dentato-rubro-thalamo-cortical tract (DRTT) intersecting the MRgFUS thalamotomy lesions in 17 essential tremor patients. The resulting tract was divided into regions of interest (ROI), which were then analyzed on pre-, one day post-, and three months post-treatment scans. Fractional anisotropy (FA), and mean, axial, and radial diffusivity (MD, AD, and RD) were computed in each ROI at each time point. At both one day and three months post-treatment, we observed decreased FA and increased MD and RD in the section of the treated tract between the lesion and cortex. At three months post-treatment, we additionally observed increased AD in the section between the lesion and cortex, and decreased FA in the section between the dentate nucleus and the decussation of the superior cerebellar peduncles. Diffusion changes at one day post-treatment may reflect local, acute effects such as inflammation and edema, as opposed to chronic degenerative processes such as axonal degeneration and myelin loss that would be expected at later time points. No significant correlations were detected between diffusion measures and clinical effects, suggesting that microstructural changes in the treated portion of the DRTT alone do not fully explain tremor reduction and motivating additional research using higher spatial resolution diffusion imaging and multimodal approaches such as integrating diffusion and functional magnetic resonance imaging data. Our individualized approach, in which patient-specific lesions are incorporated into the tractography analysis, provided novel insight into both immediate and longer term MRgFUS-related microstructural brain changes.http://www.sciencedirect.com/science/article/pii/S2666956021000088Focused ultrasoundThalamotomyTremorDiffusion MRIDentato-rubro-thalamo-cortical tract
spellingShingle Erin L. Mazerolle
Robyn Warwaruk-Rogers
Paul Romo
Tejas Sankar
Sarah Scott
Conrad P. Rockel
Samuel Pichardo
Davide Martino
Zelma H.T. Kiss
G. Bruce Pike
Diffusion imaging changes in the treated tract following focused ultrasound thalamotomy for tremor
NeuroImage: Reports
Focused ultrasound
Thalamotomy
Tremor
Diffusion MRI
Dentato-rubro-thalamo-cortical tract
title Diffusion imaging changes in the treated tract following focused ultrasound thalamotomy for tremor
title_full Diffusion imaging changes in the treated tract following focused ultrasound thalamotomy for tremor
title_fullStr Diffusion imaging changes in the treated tract following focused ultrasound thalamotomy for tremor
title_full_unstemmed Diffusion imaging changes in the treated tract following focused ultrasound thalamotomy for tremor
title_short Diffusion imaging changes in the treated tract following focused ultrasound thalamotomy for tremor
title_sort diffusion imaging changes in the treated tract following focused ultrasound thalamotomy for tremor
topic Focused ultrasound
Thalamotomy
Tremor
Diffusion MRI
Dentato-rubro-thalamo-cortical tract
url http://www.sciencedirect.com/science/article/pii/S2666956021000088
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