PURPOSE To assess the usefulness of fast fluid-attenuated inversion-recovery (FLAIR) MR sequences in the diagnosis of intracranial infectious diseases. METHODS We compared fast FLAIR images with conventional spin-echo images (T1- and T2-weighted) obtained in 20 patients with infectious diseases (six with encephalitis, five with brain abscesses, three with meningitis, two with meningoencephali...

BACKGROUND AND PURPOSE We investigated if hyperintensities on fluid-attenuated inversion recovery (FLAIR) sequences in arteries and parenchyma are associated with poor outcome 3 months after thrombolysis. METHODS Consecutive acute stroke patients with known time of symptom onset who had an MRI before and 1 day after thrombolysis were included in this study. Blinded to follow-up imaging and ou...

Introduction Diffusion weighted imaging (DWI) allows the determination of the apparent diffusion coefficient (ADC). Since several tissue compartments may be present in a voxel, e.g. tissue and cerebrospinal fluid [1] or tissue and blood [2], the measured ADC is an averaged value, weighted by these partial volumes. To reduce this partial volume effect, several investigators tried to null the mag...

The purpose of this study was to investigate the possibility that some artifactual high signals produced in CSF with fluid-attenuated inversion-recovery MR sequences could be due to inhomogeneity in the amplitude of the initial inversion pulse, and that this problem could be reduced or eliminated by the use of adiabatic inversion pulses. Studies with four volunteers showed dependence of high CS...

Background T1-weighted variable-flip-angle 3D TSE has emerged as a promising intracranial vessel wall imaging technique. To increase spatial coverage and cerebrospinal fluid (CSF) attenuation, a whole-brain 0.5-mm-reoslution protocol based on an inversion-prepared 3D TSE sequence has recently been proposed at 3T. However, its 11-12-min scan time renders it clinically impractical. This work aime...

The Farnsworth Unit in northern Texas is a field site for studying geologic carbon storage during enhanced oil recovery (EOR) using CO2. Microseismic monitoring essential risk assessment by detecting fluid leakage and fractures. We analyzed borehole microseismic data acquired CO2 injection migration, including denoising, event detection, location, magnitude estimation, moment tensor inversion, ...

BACKGROUND AND PURPOSE Conventional imaging methods cannot depict the vessel wall of intracranial arteries at sufficient resolutions. This hampers the evaluation of intracranial arterial disease. The aim of the present study was to develop a high-resolution MRI method to image intracranial vessel wall. METHODS We developed a volumetric (3-dimensional) turbo spin-echo (TSE) sequence for intrac...