Brain T_2 Dynamic MRI Using HASTE Sequence

BOLD fMRI using a modified HASTE sequence

For more than a decade, turbo spin echo (TSE) pulse sequences have been suggested as an alternative to echo planar imaging (EPI) sequences for fMRI studies. Recent development in parallel imaging has renewed the interest in developing more robust TSE sequences for fMRI. In this study, a modified half Fourier acquisition single-shot TSE (mHASTE) sequence has been developed with a three-fold GRAP...

HASTE diffusion-weighted MRI for the reliable detection of cholesteatoma.

PURPOSE To assess the detection efficiency of Half-Fourier acquisition single-shot turbo spin-echo (HASTE) diffusion-weighted magnetic resonance imaging (MRI) for cholesteatoma. MATERIALS AND METHODS A total of 21 patients with suspected primary (n=16) or recurrent cholesteatoma (n=5) underwent MRI in a 1.5 Tesla scanner using an adapted protocol for cholesteatoma detection that included a co...

HASTE sequences for functional MRI: BOLD and VASO

B. A. Poser, D. G. Norris FC Donders Centre for Cognitive Neuroimaging, Nijmegen, Netherlands Introduction Multiply-refocused sequences such as HASTE are attractive for functional MRI (fMRI) as they are free of susceptibility artifacts, and yield pure T2 contrast. The latter can be advantageous for two fMRI applications: First, spin echo (SE) based fMRI. SE reportedly offers better spatial loca...

Studies of BOLD Signal Characteristics Using A Modified HASTE Sequence with GRAPPA

Introduction: Echo planar imaging (EPI) is widely used in fMRI due to its high sensitivity to T2* contrast and high temporal resolution to capture the BOLD response. However, susceptibility variations and eddy currents can result in signal voids, image distortion and ghosting, limiting EPI’s applicability in some brain regions. Additionally, T2* changes in the down stream of veins can lead to p...

Brain MRI Findings in Tramadol Poisoning