Search results for "Echo-Planar Imaging"

showing 6 items of 16 documents

Mathematical models for the diffusion magnetic resonance signal abnormality in patients with prion diseases

2014

In clinical practice signal hyperintensity in the cortex and/or in the striatum on magnetic resonance (MR) diffusion-weighted images (DWIs) is a marker of sporadic Creutzfeldt–Jakob Disease (sCJD). MR diagnostic accuracy is greater than 90%, but the biophysical mechanisms underpinning the signal abnormality are unknown. The aim of this prospective study is to combine an advanced DWI protocol with new mathematical models of the microstructural changes occurring in prion disease patients to investigate the cause of MR signal alterations. This underpins the later development of more sensitive and specific image-based biomarkers. DWI data with a wide a range of echo times and diffusion weightin…

MalePathologysCJD sporadic Creutzfeldt–Jakob diseaseROI region of interestPrion diseasePrPSc prion protein scrapieElectroencephalographyFOV field of viewlcsh:RC346-429Prion DiseasesADC apparent diffusion coefficientTI inversion timeRPE rapidly progressive encephalopathyAged 80 and overTE echo timeBrain Mappingmedicine.diagnostic_testBrainRegular ArticleMiddle AgedBIC Bayesian information criterionTR repetition timemedicine.anatomical_structureNeurologylcsh:R858-859.7FemaleMPRAGE magnetization-prepared rapid acquisition gradient-echoAbnormalitySS-SE single shot spin-echoAdultmedicine.medical_specialtyCognitive NeuroscienceCreutzfeldt–Jakob diseaseCNR contrast to noise ratioEPI echo-planar imagingNeuropathologyPrPC prion protein cellularGrey matterSpongiform degenerationlcsh:Computer applications to medicine. Medical informaticsEEG electroencephalogramDiffusion MRINeuroimagingImage Interpretation Computer-AssistedmedicineHumansRadiology Nuclear Medicine and imaginglcsh:Neurology. Diseases of the nervous systemAgedCJD Creutzfeldt–Jakob diseaseGSS Gerstmann–Sträussler–Scheinker syndromebusiness.industryDWI diffusion weighted imagingDiffusion MRI; Biophysical models; Creutzfeldt-Jakob disease; Prion disease; Spongiform degenerationMagnetic resonance imagingModels TheoreticalHyperintensityCreutzfeldt-Jakob diseaseDiffusion Magnetic Resonance ImagingNeurology (clinical)businessBiophysical modelsDiffusion MRINeuroImage: Clinical
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Bilateral Wallerian degeneration of the medial cerebellar peduncles after ponto-mesencephalic infarction

2003

Three patients with acute large paramedian ponto-mesencephalic infarctions developed a bilateral retrograde degeneration of the medial cerebellar peduncles within 4 months after the insult. In an initial magnetic resonance imaging (MRI) within the first 2 weeks, the medial cerebellar peduncles showed normal intensities, but a control MRI after 4 months showed bright hyperintensities in the T2-TSE weighted images, and moderately increased signal intensities in echo planar imaging-diffusion weighted imaging were seen, possibly representing bilateral Wallerian degeneration of the cerebellar-pontine fibers.

MaleWallerian degenerationPathologymedicine.medical_specialtyRetrograde DegenerationBrain Stem InfarctionsInfarctionCentral nervous system diseasePonsmedicineHumansRadiology Nuclear Medicine and imagingAgedmedicine.diagnostic_testEcho-Planar Imagingbusiness.industryMagnetic resonance imagingGeneral MedicineMiddle Agedmedicine.diseaseHyperintensityDiffusion Magnetic Resonance Imagingnervous systemFemaleTomography X-Ray ComputedWallerian DegenerationbusinessEcho planarDiffusion MRIEuropean Journal of Radiology
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Time course of lesion development in patients with acute brain stem infarction and correlation with NIHSS score.

2001

diffusion weighted magnetic resonance imaging (MRI) is highly sensitive in detecting acute supratentorial cerebral ischemia and Diffusion Weighted Imaging (DWI) lesion size has been shown to correlate strongly with the neurologic deficit in middle cerebral artery territory stroke. However, data concerning infratentorial strokes are rare. We examined the size and evolution of acute brain stem ischemic lesions and their relationship to neurological outcome.brain stem infarctions of 11 patients were analyzed. We performed DWI in all patients and in 7/11 patients within 24 h, T2W sequences within the first 2 weeks (10/11 patients) and follow-up MRI (MR2) within 3-9 months (median 4.8 months) la…

Malemedicine.medical_specialtyBrain Stem InfarctionsTime FactorsIschemiaInfarctionSeverity of Illness IndexCentral nervous system diseaseLesionInternal medicinemedicine.arterymedicineHumansRadiology Nuclear Medicine and imagingcardiovascular diseasesStrokemedicine.diagnostic_testbusiness.industryEcho-Planar ImagingMagnetic resonance imagingGeneral MedicineMiddle Agedmedicine.diseaseMagnetic Resonance ImagingSurgeryStrokeMiddle cerebral arteryCardiologyFemalemedicine.symptombusinessDiffusion MRIEuropean journal of radiology
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MR-guided focused ultrasound application for moving target tumor ablation in abdominal area: Coil selection

2020

PubMed: 32276552

SwineThermal ablationMagnetic Resonance Imaging InterventionalTumor ablationFocused ultrasound030218 nuclear medicine & medical imagingMagnetic resonance guided focused ultrasound surgery03 medical and health sciencesCE marking0302 clinical medicineEcho planar imagingAbdomenAnimalsHumansMedicineRadiology Nuclear Medicine and imagingRadiological and Ultrasound TechnologyEcho-Planar ImagingPhantoms Imagingbusiness.industryCoils magnetic resonance thermometry tracking echo planar imaging magnetic resonance-guided focused-ultrasound surgery CE marking validation verificationTrackingLiver NeoplasmsVerificationSettore MED/37 - NeuroradiologiaCoilsGeneral MedicineFocused ultrasound surgeryDisease Models AnimalLiverMagnetic resonance thermometryElectromagnetic coil030220 oncology & carcinogenesisHigh-Intensity Focused Ultrasound AblationbusinessSettore MED/36 - Diagnostica Per Immagini E RadioterapiaMri guidedMagnetic resonance thermometryBiomedical engineering
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Imaging of Vestibular Schwannoma With Prevalent Cystic Component

2009

Not available

Vestibular systemPathologymedicine.medical_specialtyacoustic neuromaEcho-Planar Imagingbusiness.industryEpidermal CystCerebellopontine AngleNeuroma AcousticSchwannomamedicine.diseaseSensory SystemsneurinomaArachnoid Cystsvestibular schwannomaOtorhinolaryngologyComponent (UML)medicineHumansNeurology (clinical)businessEar CanalOtology & Neurotology
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Diffusion-weighted MRI of cholesteatomas of the petrous bone

2002

Purpose To investigate if primary cholesteatomas of the petrous bone show high signal in diffusion-weighted imaging (DWI). Materials and methods In this blinded study, we compared 15 patients with clinically certain cases and later surgically proven cholesteatomas vs. 12 patients with clinically acute otitis of the middle ear and 20 volunteers without petrous bone disease. Two blinded readers without knowledge of the clinical data decided in consensus agreement whether there was a pathologic signal increase in the petrous bone in an anisotropic single-shot echo-planar imaging (EPI) DWI sequence, an artifact, or no signal increase. Results Thirteen of 15 patients with cholesteatomas showed b…

medicine.medical_specialtyEar MiddlePetrous boneotorhinolaryngologic diseasesmedicineHumansRadiology Nuclear Medicine and imagingProspective StudiesCholesteatomaProspective cohort studyNeuroradiologymedicine.diagnostic_testEcho-Planar Imagingbusiness.industryCholesteatomaMagnetic resonance imagingmedicine.diseaseMagnetic Resonance ImagingOtitis MediaOtitismedicine.anatomical_structureMiddle earRadiologymedicine.symptomArtifactsbusinessPetrous BoneDiffusion MRIJournal of Magnetic Resonance Imaging
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