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DT-MRI muscle

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https://www.readbyqxmd.com/read/27862471/assessment-of-passive-muscle-elongation-using-diffusion-tensor-mri-correlation-between-fiber-length-and-diffusion-coefficients
#1
Valentina Mazzoli, Jos Oudeman, Klaas Nicolay, Mario Maas, Nico Verdonschot, Andre M Sprengers, Aart J Nederveen, Martijn Froeling, Gustav J Strijkers
In this study we investigated the changes in fiber length and diffusion parameters as a consequence of passive lengthening and stretching of the calf muscles. We hypothesized that changes in radial diffusivity (RD) are caused by changes in the muscle fiber cross sectional area (CSA) as a consequence of lengthening and shortening of the muscle. Diffusion Tensor MRI (DT-MRI) measurements were made twice in five healthy volunteers, with the foot in three different positions (30° plantarflexion, neutral position and 15° dorsiflexion)...
November 8, 2016: NMR in Biomedicine
https://www.readbyqxmd.com/read/27257975/skeletal-muscle-diffusion-tensor-mri-fiber-tracking-rationale-data-acquisition-and-analysis-methods-applications-and-future-directions
#2
Bruce M Damon, Martijn Froeling, Amanda K W Buck, Jos Oudeman, Zhaohua Ding, Aart J Nederveen, Emily C Bush, Gustav J Strijkers
The mechanical functions of muscles involve the generation of force and the actuation of movement by shortening or lengthening under load. These functions are influenced, in part, by the internal arrangement of muscle fibers with respect to the muscle's mechanical line of action. This property is known as muscle architecture. In this review, we describe the use of diffusion tensor (DT)-MRI muscle fiber tracking for the study of muscle architecture. In the first section, the importance of skeletal muscle architecture to function is discussed...
June 3, 2016: NMR in Biomedicine
https://www.readbyqxmd.com/read/27007789/in-vivo-reconstruction-of-lumbar-erector-spinae-architecture-using-diffusion-tensor-mri
#3
Judith M Sieben, Ilse van Otten, Arno Lataster, Martijn Froeling, Aart J Nederveen, Gustav J Strijkers, Maarten R Drost
STUDY DESIGN: Diffusion tensor magnetic resonance imaging (DT-MRI) reconstruction of lumbar erector spinae (ES) compared with cadaver dissection. OBJECTIVE: The aim of this study was to reconstruct the human lumbar ES from in vivo DT-MRI measurements and to compare the results with literature and cadaver dissection. SUMMARY OF BACKGROUND DATA: DT-MRI enables 3-dimensional in vivo reconstruction of muscle architecture. Insight in ES architecture may improve the understanding of low back function...
April 2016: Clinical Spine Surgery
https://www.readbyqxmd.com/read/26010830/anisotropic-smoothing-improves-dt-mri-based-muscle-fiber-tractography
#4
Amanda K W Buck, Zhaohua Ding, Christopher P Elder, Theodore F Towse, Bruce M Damon
PURPOSE: To assess the effect of anisotropic smoothing on fiber tracking measures, including pennation angle, fiber tract length, and fiber tract number in the medial gastrocnemius (MG) muscle in healthy subjects using diffusion-weighted magnetic resonance imaging (DW-MRI). MATERIALS AND METHODS: 3T DW-MRI data were used for muscle fiber tractography in the MG of healthy subjects. Anisotropic smoothing was applied at three levels (5%, 10%, 15%), and pennation angle, tract length, fiber tract number, fractional anisotropy, and principal eigenvector orientation were quantified for each smoothing level...
2015: PloS One
https://www.readbyqxmd.com/read/24136055/in-vivo-reconstruction-of-lumbar-erector-spinae-architecture-using-diffusion-tensor-mri
#5
Judith M Sieben, Ilse van Otten, Arno Lataster, Martijn Froeling, Aart J Nederveen, Gustav J Strijkers, Maarten R Drost
STUDY DESIGN: Diffusion Tensor MRI (DT-MRI) reconstruction of lumbar erector spinae (ES) compared to cadaver dissection. OBJECTIVE: Aim of this study was to reconstruct the human lumbar ES from in vivo DT-MRI measurements and to compare the results with literature and cadaver dissection. SUMMARY OF BACKGROUND DATA: DT-MRI enables three-dimensional in vivo reconstruction of muscle architecture. Insight in ES architecture may improve understanding of low back function...
October 16, 2013: Journal of Spinal Disorders & Techniques
https://www.readbyqxmd.com/read/23418124/quantitative-effects-of-inclusion-of-fat-on-muscle-diffusion-tensor-mri-measurements
#6
Sarah E Williams, Anneriet M Heemskerk, E Brian Welch, Ke Li, Bruce M Damon, Jane H Park
PURPOSE: To determine the minimum water percentage in a muscle region of interest that would allow diffusion tensor (DT-) MRI data to reflect the diffusion properties of pure muscle accurately. MATERIALS AND METHODS: Proton density-weighted images with and without fat saturation were obtained at the mid-thigh in four subjects. Co-registered DT-MR images were used to calculate the diffusion tensor's eigenvalues and fractional anisotropy. RESULTS: The eigenvalues transitioned monotonically as a function of water signal percentage from values near to those expected for pure fat to those for pure muscle...
November 2013: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/22644795/diffusion-tensor-mri-to-assess-skeletal-muscle-disruption-following-eccentric-exercise
#7
Naomi M Cermak, Michael D Noseworthy, Jacqueline M Bourgeois, Mark A Tarnopolsky, Martin J Gibala
INTRODUCTION: Structural evidence of exercise-induced muscle disruption has traditionally involved histological analysis of muscle tissue obtained by needle biopsy, however, there are multiple limitations with this technique. Recently, diffusion tensor magnetic resonance imaging (DT-MRI) has been successfully demonstrated to noninvasively assess skeletal muscle abnormalities induced by traumatic injury. METHODS: To determine the potential for DT-MRI to detect musculoskeletal changes after a bout of eccentric exercise, 10 healthy men performed 300 eccentric actions on an isokinetic dynamometer...
July 2012: Muscle & Nerve
https://www.readbyqxmd.com/read/22503094/polynomial-fitting-of-dt-mri-fiber-tracts-allows-accurate-estimation-of-muscle-architectural-parameters
#8
Bruce M Damon, Anneriet M Heemskerk, Zhaohua Ding
Fiber curvature is a functionally significant muscle structural property, but its estimation from diffusion-tensor magnetic resonance imaging fiber tracking data may be confounded by noise. The purpose of this study was to investigate the use of polynomial fitting of fiber tracts for improving the accuracy and precision of fiber curvature (κ) measurements. Simulated image data sets were created in order to provide data with known values for κ and pennation angle (θ). Simulations were designed to test the effects of increasing inherent fiber curvature (3...
June 2012: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/21953730/ex-vivo-water-diffusion-tensor-properties-of-the-fibroid-uterus-at-7-t-and-their-relation-to-tissue-morphology
#9
Michael J Thrippleton, Mark E Bastin, Kirsty I Munro, Alistair R Williams, Anca Oniscu, Maurits A Jansen, Gavin D Merrifield, Graham McKillop, David E Newby, Scott I Semple, Ian Marshall, Hilary O Critchley
PURPOSE: To investigate the water diffusion tensor properties of ex vivo tissue in the fibroid uterus, including the influence of degeneration, and the relevance of the principal eigenvector orientation to the underlying tissue structure. MATERIALS AND METHODS: Following hysterectomy, high-resolution structural T(2) -weighted and diffusion tensor magnetic resonance imaging (DT-MRI) were performed on nine uteri at 7 T. Mean diffusivity (MD), fractional anisotropy (FA), and principal eigenvector orientation were measured in myometrium and in myxoid and dense tissue in fibroids...
December 2011: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/21664617/in-vivo-determination-of-3d-muscle-architecture-of-human-muscle-using-free-hand-ultrasound
#10
Manku Rana, James M Wakeling
Muscle architecture is an important parameter affecting the muscle function. Most of the previous studies on in-vivo muscle architecture have used in 2D ultrasound. The importance of the third dimension has not been much explored due to lack of appropriate methods. DT-MRI has been used to study muscle architecture in 3D, however, due to long scan times of about 15 min DT-MRI has not been suitable to study active muscle contractions. The purpose of this study was to develop and validate methods to determine in-vivo muscle fascicle orientations in 3D using ultrasound...
July 28, 2011: Journal of Biomechanics
https://www.readbyqxmd.com/read/21538926/computer-three-dimensional-anatomical-reconstruction-of-the-human-sinus-node-and-a-novel-paranodal-area
#11
COMPARATIVE STUDY
Natalie Chandler, Oleg Aslanidi, David Buckley, Shin Inada, Steven Birchall, Andrew Atkinson, Danielle Kirk, Oliver Monfredi, Peter Molenaar, Robert Anderson, Vinod Sharma, Daniel Sigg, Henggui Zhang, Mark Boyett, Halina Dobrzynski
We have previously shown in rabbit that the pacemaker of the heart (the sinus node) is widespread and matches the wide distribution of the leading pacemaker site within the right atrium. There is, however, uncertainty about the precise location of the pacemaker in human heart, and its spatial relationships with the surrounding right atrial muscle. Therefore, the aim of the current study was to investigate the distribution of the sinus node tissue in a series of healthy human hearts and, for one of the hearts to construct a computer three-dimensional anatomical model of the sinus node, including the likely orientation of myocytes...
June 2011: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/20932717/gaussian-mixtures-on-tensor-fields-for-segmentation-applications-to-medical-imaging
#12
Rodrigo de Luis-García, Carl-Fredrik Westin, Carlos Alberola-López
In this paper, we introduce a new approach for tensor field segmentation based on the definition of mixtures of Gaussians on tensors as a statistical model. Working over the well-known Geodesic Active Regions segmentation framework, this scheme presents several interesting advantages. First, it yields a more flexible model than the use of a single Gaussian distribution, which enables the method to better adapt to the complexity of the data. Second, it can work directly on tensor-valued images or, through a parallel scheme that processes independently the intensity and the local structure tensor, on scalar textured images...
January 2011: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/20499182/the-correlation-of-3d-dt-mri-fiber-disruption-with-structural-and-mechanical-degeneration-in-porcine-myocardium
#13
Song Zhang, J Allen Crow, Xiaoyong Yang, Joseph Chen, Ali Borazjani, Katie B Mullins, Wei Chen, Robert C Cooper, Ronald M McLaughlin, Jun Liao
Evaluation of structural parameters following a myocardial infarction (MI) is important to assess left ventricular function and remodeling. In this study, we assessed the capability of 3D diffusion tensor magnetic resonance imaging (DT-MRI) to assess tissue degeneration shortly after an MI using a porcine model of infarction. Two days after an induced infarction, hearts were explanted and immediately scanned by a 3T MRI scanner with a diffusion tensor imaging protocol. 3D fiber tracks and clustering models were generated from the diffusion-weighted imaging data...
October 2010: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/19457790/diffusion-tensor-imaging-and-fiber-tractography-of-skeletal-muscle-optimization-of-b-value-for-imaging-at-1-5-t
#14
Nadja Saupe, Lawrence M White, Jeffrey Stainsby, George Tomlinson, Marshall S Sussman
OBJECTIVE: The aim of our study was to determine the optimal b value for 1.5-T diffusion tensor (DT) MRI and fiber tractography of in vivo human skeletal muscle. SUBJECTS AND METHODS: Five healthy volunteers were included in this prospective study. DT MRI of the proximal calf was performed with 15 directions of diffusion sensitization and parallel imaging with an acceleration factor of 2. Each single-shot spin-echo echo-planar imaging sequence was performed in each volunteer with eight b values ranging from 125 s/mm(2) to 1,000 s/mm(2)...
June 2009: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/19243049/dti-based-muscle-fiber-tracking-of-the-quadriceps-mechanism-in-lateral-patellar-dislocation
#15
J Herman Kan, Anneriet M Heemskerk, Zhaohua Ding, Andrew Gregory, Gregory Mencio, Kurt Spindler, Bruce M Damon
PURPOSE: To determine the feasibility of using diffusion tensor MRI (DT-MRI) -based muscle fiber tracking to create biomechanical models of the quadriceps mechanism in healthy subjects and those with chronic lateral patellar dislocation (LPD). MATERIALS AND METHODS: Four healthy (average 14.5 years old; BMI 21.8) and four chronic LPD (average 17.3 years old; BMI 22.4) females underwent DT and axial T1W MRI of the thighs. The anatomical and physiologic cross-sectional areas (ACSA and PCSA, respectively) and pennation angle were calculated of the vastus lateralis oblique (VLO) and vastus medialis oblique (VMO) muscles...
March 2009: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/18816814/effects-of-image-noise-in-muscle-diffusion-tensor-dt-mri-assessed-using-numerical-simulations
#16
Bruce M Damon
Diffusion tensor (DT)-MRI studies of skeletal muscle provide information about muscle architecture, microstructure, and damage. However, the effects of noise, the diffusion weighting (b)-value, and partial volume artifacts on the estimation of the diffusion tensor (D) are unknown. This study investigated these issues using Monte Carlo simulations of 3 x 9 voxel regions of interest (ROIs) containing muscle, adipose tissue, and intermediate degrees of muscle volume fractions (f(M)). A total of 1000 simulations were performed for each of eight b-values and 11 SNR levels...
October 2008: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/18708854/diffusion-tensor-magnetic-resonance-imaging-of-the-human-calf-comparison-between-1-5-t-and-3-0-t-preliminary-results
#17
COMPARATIVE STUDY
Nadja Saupe, Lawrence M White, Marshall S Sussman, Andrea Kassner, George Tomlinson, Michael D Noseworthy
OBJECTIVES: To compare diffusion tensor-magnetic resonance imaging (DT-MRI) of human calf muscles at 1.5 T and 3.0 T, and to measure a number of quantitative parameters to characterize diffusion anisotropy in organized muscle tissue using similar imaging parameters. METHODS AND MATERIALS: After Institutional Review Board approval and informed consent, five healthy volunteers were studied. Imaging was performed on both 1.5 T and 3.0 T MR systems using the similar imaging protocol...
September 2008: Investigative Radiology
https://www.readbyqxmd.com/read/18463875/assessment-of-calf-muscle-contraction-by-diffusion-tensor-imaging
#18
J F Deux, P Malzy, N Paragios, G Bassez, A Luciani, P Zerbib, F Roudot-Thoraval, A Vignaud, H Kobeiter, A Rahmouni
The goal of this study was to assess the changes of water diffusion during contraction and elongation of calf muscles using diffusion tensor (DT) MRI in normal volunteers. Twenty volunteers (mean age, 29+/-4 years) underwent DT MRI examination of the right calf. Echo planar imaging sequence was performed at rest, during dorsal flexion and during plantar flexion. The three eigenvalues (lambda1, lambda2, and lambda3), apparent diffusion coefficient (ADC) and fractional anisotropy (FA) of the diffusion tensor were calculated for medial gastrocnemius (mGM) and tibialis anterior (TA)...
October 2008: European Radiology
https://www.readbyqxmd.com/read/17446411/quantitative-diffusion-tensor-mri-based-fiber-tracking-of-human-skeletal-muscle
#19
Drew A Lansdown, Zhaohua Ding, Megan Wadington, Jennifer L Hornberger, Bruce M Damon
Diffusion-tensor magnetic resonance imaging (DT-MRI) offers great potential for understanding structure-function relationships in human skeletal muscles. The purposes of this study were to demonstrate the feasibility of using in vivo human DT-MRI fiber tracking data for making pennation angle measurements and to test the hypothesis that heterogeneity in the orientation of the tibialis anterior (TA) muscle's aponeurosis would lead to heterogeneity in pennation angle. Eight healthy subjects (5 male) were studied...
August 2007: Journal of Applied Physiology
https://www.readbyqxmd.com/read/12111936/validation-of-diffusion-tensor-mri-based-muscle-fiber-tracking
#20
Bruce M Damon, Zhaohua Ding, Adam W Anderson, Andrea S Freyer, John C Gore
Diffusion-tensor (DT) MRI fiber tracking may potentially be used for in vivo structural analysis. The purpose of this study was to assess quantitatively the ability of a DT-MRI fiber-tracking algorithm to measure the fiber orientation (pennation) in skeletal muscle in vivo. In five adult Sprague-Dawley rats, the pennation angle (theta) was measured in the rat lateral gastrocnemius with DT-MRI (theta(DT-MRI)) and by direct anatomical inspection (DAI) (theta(DAI)). The mean theta(DT-MRI) was not significantly different from the mean theta(DAI)...
July 2002: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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