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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

432
Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Longitudinal quantitative MRI in multiple system atrophy and progressive supranuclear palsy.

William Reginold1, Anthony E Lang2, Connie Marras2

  • 1Morton and Gloria Shulman Movement Disorders Centre and the Edmond J. Safra Program in Parkinson's Disease, Toronto Western Hospital, Canada; Department of Medical Imaging, Toronto Western Hospital, the Joint Department of Medical Imaging, and The University of Toronto, Canada.

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Longitudinal MRI reveals progressive neurodegeneration in multiple system atrophy (MSA) and progressive supranuclear palsy (PSP) within two years. Key findings include increasing putaminal apparent diffusion coefficient (ADC) in PSP and pontine atrophy in MSA.

Keywords:
Diffusion imagingGradient echoMultiple system atrophyProgressive supranuclear palsyVolumetric MRI

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Area of Science:

  • Neuroimaging
  • Neurology
  • Radiology

Background:

  • Magnetic Resonance Imaging (MRI) is utilized in parkinsonism to evaluate atrophy, water diffusivity, and mineral deposition, typically at a single time point.
  • Multiple System Atrophy (MSA) and Progressive Supranuclear Palsy (PSP) are characterized by progressive neurodegenerative processes.
  • Assessing the temporal progression of these diseases using MRI is crucial for understanding their natural history.

Purpose of the Study:

  • To evaluate the utility of longitudinal MRI in characterizing the time course of neurodegeneration in MSA and PSP.
  • To identify specific MRI markers that reflect disease progression in these conditions.

Main Methods:

  • Retrospective analysis of two serial MRI scans (mean 23 months apart) from 12 MSA patients, 6 PSP patients, and 18 age/sex-matched controls.
  • Assessment included cross-sectional areas, regional apparent diffusion coefficient (ADC), and gradient echo (GRE) intensity ratios in key brain structures (lateral ventricles, caudate, putamen, middle cerebellar peduncle, pons, midbrain).

Main Results:

  • Progressive putaminal ADC increase was significantly greater in PSP compared to controls (p = 0.02).
  • MSA exhibited greater pontine volume loss over time compared to controls (p = 0.002).
  • In MSA, changes in middle cerebellar peduncle ADC correlated with motor symptom severity (Unified Parkinson's Disease Rating Scale Part III, p = 0.005).

Conclusions:

  • Longitudinal MRI can detect evidence of progressive neurodegeneration in MSA and PSP within a two-year period.
  • Specific MRI findings, such as increasing putaminal ADC in PSP and pontine atrophy in MSA, serve as indicators of disease progression.