منابع مشابه
T2-weighted BOLD fMRI at 9.4 T using a S2-SSFP-EPI sequence
Introduction: It has been hypothesized that T2-weighted BOLD fMRI at ultra-high field shows higher spatial specificity than T2*weighted BOLD, since the main signal contribution is expected to come from the extravascular spins of the microvasculature [1-3]. Unfortunately, the number of slices that can be acquired in multi-slice SE-EPI is often highly limited at ultra-high field due to SAR constr...
متن کاملAnalysis of Streak Artifacts in Gradient-Echo EPI Sequence Using 1.5T MRI System
Introduction Even though echo-planar-imaging (EPI) sequence is the fastest imaging method, EPI sequences (gradient-echo (GRE) or spin-echo (SE)) have limitations in application areas due to two major artifacts, Nyquist ghost artifact and geometric distortion. In order to reduce the ghost and geometric artifacts, nonlinear phase correction methods were developed [1]. However, the nonlinear phase...
متن کاملT2-Weighted Liver MRI Using the MultiVane Technique at 3T: Comparison with Conventional T2-Weighted MRI
OBJECTIVE To assess the value of applying MultiVane to liver T2-weighted imaging (T2WI) compared with conventional T2WIs with emphasis on detection of focal liver lesions. MATERIALS AND METHODS Seventy-eight patients (43 men and 35 women) with 86 hepatic lesions and 20 pancreatico-biliary diseases underwent MRI including T2WIs acquired using breath-hold (BH), respiratory-triggered (RT), and M...
متن کاملImproved coverage in dynamic contrast-enhanced cardiac MRI using interleaved gradient-echo EPI.
An interleaved gradient-echo echo-planar imaging (IGEPI) sequence was modified for and applied to dynamic contrast-enhanced imaging of the heart. Using IGEPI, images with 3.0 x 3.9 mm nominal in-plane resolution are acquired in 100 ms, enabling eight slices per heartbeat for a heart rate of 60 beats/min. The acquisition speed and use of saturation prepulses allows acquisition of short- and long...
متن کاملFunctional MRI using sensitivity-encoded echo planar imaging (SENSE-EPI).
Parallel imaging methods become increasingly available on clinical MR scanners. To investigate the potential of sensitivity-encoded single-shot EPI (SENSE-EPI) for functional MRI, five imaging protocols at different SENSE reduction factors (R) and matrix sizes were compared with respect to their noise characteristics and their sensitivity toward functional activation in a motor task examination...
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ژورنال
عنوان ژورنال: Japanese Journal of Radiological Technology
سال: 1996
ISSN: 0369-4305,1881-4883
DOI: 10.6009/jjrt.kj00001354929