Search results for "Mri studies"

showing 4 items of 4 documents

MRI studies after treatment of brain tumors in childhood and adolescence

1986

Forty-seven children and adolescents with brain tumors were examined by magnetic resonance imaging (MRI) after tumor resection. The typical changes and complications after surgery and chemotherapy, as well as the corresponding MRI findings, are discussed. Typical examples of boundary-layer lesions, tumor recurrences, hydrocephalus, porencephalic cysts, and hygromas are given.

AdultEpidural SpaceMalemedicine.medical_specialtyMagnetic Resonance SpectroscopyAdolescentmedicine.medical_treatmentTumor resectionSubdural SpaceMri studiesPostoperative ComplicationsmedicineHumansChildBrain DiseasesChemotherapyLymphangiomamedicine.diagnostic_testBrain Neoplasmsbusiness.industryInfantMagnetic resonance imagingGeneral Medicinemedicine.diseasePorencephalyHydrocephalusChild PreschoolPediatrics Perinatology and Child HealthFemaleNeurology (clinical)RadiologyNeurosurgeryAtrophyNeoplasm Recurrence LocalbusinessAfter treatmentHydrocephalusChild's Nervous System
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A human post-mortem brain model for the standardization of multi-centre MRI studies

2015

Multi-centre MRI studies of the brain are essential for enrolling large and diverse patient cohorts, as required for the investigation of heterogeneous neurological and psychiatric diseases. However, the multi-site comparison of standard MRI data sets that are weighted with respect to tissue parameters such as the relaxation times (T1, T2) and proton density (PD) may be problematic, as signal intensities and image contrasts depend on site-specific details such as the sequences used, imaging parameters, and sensitivity profiles of the radiofrequency (RF) coils. Water or gel phantoms are frequently used for long-term and/or inter-site quality assessment. However, these phantoms hardly mimic t…

Models Anatomicmedicine.medical_specialtyNeurologyCognitive NeuroscienceModels NeurologicalMulti-centre MRI studies; Post-mortem brain; Quantitative MRI; Standardization; Aged; Artifacts; Brain; Female; Humans; Magnetic Resonance Imaging; Multicenter Studies as Topic; Phantoms Imaging; Reproducibility of Results; Models Anatomic; Models Neurological; Postmortem Changes; Cognitive Neuroscience; Neurology; Medicine (all)Cognitive neuroscienceImaging phantomPhantomsImagingWhite matterModelsPost-mortem brainmedicineHumansMulticenter Studies as TopicMagnetization transferMulti-centre MRI studiesAgedmedicine.diagnostic_testbusiness.industryPhantoms ImagingMedicine (all)AnatomicBrainReproducibility of ResultsMagnetic resonance imagingHuman brainQuantitative MRIMagnetic Resonance ImagingStandardizationmedicine.anatomical_structureNeurologyPostmortem ChangesNeurologicalFemaleBrainstemNuclear medicinebusinessArtifacts
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Variations in the size of focal nodular hyperplasia on magnetic resonance imaging

2013

Abstract Objective To evaluate the changes in the size of focal nodular hyperplasia (FNH) during long-term magnetic resonance imaging (MRI) follow-up. Material and methods We reviewed 44 FNHs in 30 patients studied with MRI with at least two MRI studies at least 12 months apart. We measured the largest diameter of the lesion (in mm) in contrast-enhanced axial images and calculated the percentage of variation as the difference between the maximum diameter in the follow-up and the maximum diameter in the initial study. We defined significant variation in size as variation greater than 20%. We also analyzed predisposing hormonal factors. Results The mean interval between the two imaging studie…

Pathologymedicine.medical_specialtymedicine.diagnostic_testBirth control pillsbusiness.industryFocal nodular hyperplasiaMagnetic resonance imagingMri studiesmedicine.diseaseLesionMaximum diametermedicineGeneral Earth and Planetary Sciencesmedicine.symptomNuclear medicinebusinessGeneral Environmental ScienceRadiología (English Edition)
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Design of Porphyrin-dota-Like Scaffolds as All-in-One Multimodal Heterometallic Complexes for Medical Imaging

2013

A series of four multimodal ligands incorporating one porphyrin moiety and one or more dota-like macrocycles all-in-one in the same molecular architecture have been synthesized and full characterized. The corresponding gadolinium(III) complexes were also synthesized and heterometallic complexes incorporating both gadolinium(III) and copper(II) ions were prepared as potential MRI/PET multimodal contrast agents. One ligand (L4) includes an amine moiety that can be activated for easy conversion into an isothiocyanate group for further anchoring to a biological vector. Preliminary relaxivity, cytotoxicity, and MRI studies showed that the complexes developed in this work are very promising medic…

StereochemistryLigandGadoliniumOrganic Chemistrychemistry.chemical_elementMri studiesCombinatorial chemistryPorphyrinchemistry.chemical_compoundchemistryIsothiocyanateDOTAMoietyAmine gas treatingPhysical and Theoretical ChemistryEuropean Journal of Organic Chemistry
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