نتایج جستجو برای: magnetization transfer ratio mtr

تعداد نتایج: 795318  

2013
Mirco Cosottini Paolo Cecchi Selina Piazza Ilaria Pesaresi Serena Fabbri Stefano Diciotti Mario Mascalchi Gabriele Siciliano Ubaldo Bonuccelli

Pathological and imaging data indicate that amyotrophic lateral sclerosis (ALS) is a multisystem disease involving several cerebral cortical areas. Advanced quantitative magnetic resonance imaging (MRI) techniques enable to explore in vivo the volume and microstructure of the cerebral cortex in ALS. We studied with a combined voxel-based morphometry (VBM) and magnetization transfer (MT) imaging...

Journal: :Archives of neurology 2002
Matilde Inglese Angelo Ghezzi Stefania Bianchi Simonetta Gerevini Maria Pia Sormani Vittorio Martinelli Giancarlo Comi Massimo Filippi

OBJECTIVES To assess, by magnetic resonance imaging, the volumes and magnetization transfer ratio (MTR) values of optic nerves (ONs) from patients with multiple sclerosis (MS) who had incomplete or no visual recovery after optic neuritis; and to compare these quantities with those derived from ONs from patients with MS who showed a marked clinical recovery after optic neuritis, ONs from healthy...

Alireza Bozorgy Behrooz Rafiei Kavoos Firouznia Khodarahm Pahlevan Majid Shakiba Masumeh Fouladi Mohammad Hossein Harirchian Morteza Bakhtiary Nader Riyahi-Alam,

Introduction: Multiple sclerosis (MS) is characterized by lesions in the white matter (WM) of the central nervous system. Magnetic resonance imaging is the most specific and sensitive method for diagnosis of multiple sclerosis. However, the ability of conventional MRI to show histopathologic heterogeneity of MS lesions is insufficient. Quantitative magnetization transfer imaging (qMTI) is a rel...

Journal: :AJNR. American journal of neuroradiology 2007
B H Ridha M R Symms D J Tozer K C Stockton C Frost M M Siddique E B Lewis D G MacManus P A Boulby G J Barker M N Rossor N C Fox P S Tofts

BACKGROUND AND PURPOSE Alzheimer disease (AD) is accompanied by macroscopic atrophy on volumetric MR imaging. A few studies have also demonstrated reduction in magnetization transfer ratio (MTR), suggesting microstructural changes in remaining brain tissue. This study assessed the value of measuring MTR in addition to volumetric MR in differentiating patients with AD from control subjects. MA...

2009
S. Yalamanchili G. L. Bennett P. Storey A. B. Rosenkrantz

Introduction: Current pelvic MRI protocols rely predominantly on anatomic sequences for evaluation of the uterus. Functional MR sequences may provide imaging biomarkers with added value for the detection, characterization, and follow-up of treatment response of benign and malignant uterine pathology. Examples of functional MR parameters that have been explored within the uterus in separate stud...

2013
James H Holmes Alexey Samsonov Patrick A Turski Aaron S Field Kevin M Johnson

auditory canal (red arrows) and lack of geometric distortion due to off resonance. Figure 1. Reformats of images acquired with the MT pulse far (MT off) and near (MT on) offresonance, and the resulting MTR. Note gray white matter contrast (column 2), high resolution allowing depiction of the cerebellum (red arrows) and lack of distortion near the sinus and auditory canals (yellow arrow). Magnet...

2014
Robert A. Brown Sridar Narayanan Douglas L. Arnold

Multiple sclerosis (MS) is characterized by the formation of demyelinating lesions in the white matter (WM). However, the timecourse of the evolution of healthy white matter into fully demyelinated lesions in MS is not well understood. We use a recently proposed technique to examine magnetization transfer ratio (MTR) timecourses in lesions segmented from MTR images in patients with relapsing-re...

2017
J. Dehmeshki G. J. Barker P. S. Tofts

This paper presents a new approach to characterize subtle diffuse changes in multiple sclerosis (MS) using histograms derived from magnetization transfer ratio (MTR) images. Two major parts dominate our histogram analysis; 1) Classification of MTR histograms into control and MS subgroups; 2) Correlation with current disability, as measured by the EDSS scale (a measure of disease severity). Two ...

Journal: :Annals of neurology 1998
M Filippi M A Rocca G Martino M A Horsfield G Comi

Serial monthly magnetization transfer (MT) imaging was performed to evaluate whether a change of the normal appearing white matter (NAWM), which precedes the appearance of enhancing lesions, is seen in patients with multiple sclerosis (MS). Every 4 weeks for 3 months, 10 patients with relapsing-remitting MS were scanned with a T1-weighted sequence, 20 minutes after injection with 0.3 mmol/kg ga...

Journal: :NeuroImage 2010
Rachel M. Brouwer René C. W. Mandl Jiska S. Peper G. Caroline M. van Baal René S. Kahn Dorret I. Boomsma Hilleke E. Hulshoff Pol

Overall brain size is strikingly heritable throughout life. The influence of genes on variation in focal gray and white matter density is less pronounced and may vary with age. This paper describes the relative influences of genes and environment on variation in white matter microstructure, measured along fiber tracts with diffusion tensor imaging and magnetization transfer imaging, in a sample...

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