Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Feb 2014
Comparative StudyIntra- and interscanner reliability and reproducibility of 3D whole-brain pseudo-continuous arterial spin-labeling MR perfusion at 3T.
To assess the reliability and reproducibility of pseudo-continuous arterial spin labeling (pCASL). Intra- and interscanner reliability and reproducibility are essential before pooling perfusion imaging data. ⋯ Although excellent intra- and interscanner reliability and reproducibility could support the feasibility of cross-site pooling of ASL data, pCASL with multiple PLDs may better assess the CBF of the human brain.
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J Magn Reson Imaging · Feb 2014
Randomized Controlled Trial Comparative StudyComparison of three-dimensional pseudo-continuous arterial spin labeling perfusion imaging with gradient-echo and spin-echo dynamic susceptibility contrast MRI.
To compare the relative cerebral blood flow (CBF) obtained by pseudo-continuous arterial spin labeling sequence incorporated with volumetric fast spin-echo readout (3D-PCASL) with those by gradient-echo (GE) and spin-echo (SE) dynamic susceptibility contrast (DSC) MRI. ⋯ This study suggested that perfusion images obtained from 3D-PCASL exhibited significant correlations with DSC-MRI, with greater microvascular weighting like SE-DSC.
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J Magn Reson Imaging · Feb 2014
Effects of receive-only inserts on specific absorption rate, B1 (+) field, and Tx coil performance.
To evaluate the effect of different cylindrical and close-conforming receive-only array designs on spin excitation and specific absorption rate (SAR) of a 7 T transmit-only head coil. ⋯ Changes in local/global SAR and subtle changes in B1 (+) field distributions were observed in the presence of Rx-only inserts. Thus, incorporation of the receive-only array effects are needed when evaluating SAR and designing RF transmit pulse waveform parameters for shimming and/or Tx-SENSE for 7 T MRI.
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J Magn Reson Imaging · Feb 2014
Whole-body MR angiography: first experiences with the new TimCT technology with single contrast injection.
To assess image quality, presence of artifacts, arterial stenosis, and interobserver agreement of Tim-CT in assessment of the arterial system using contrast-enhanced whole-body-MRA (CE-Wb-MRA) with a single contrast-medium injection in patients with arteriosclerosis. ⋯ CE-Wb-MRA using the TimCT technology and with a single contrast injection is a feasible tool for whole-body MRA.
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J Magn Reson Imaging · Jan 2014
Impact of reduced k-space acquisition on pathologic detectability for volumetric MR spectroscopic imaging.
To assess the impact of accelerated acquisitions on the spectral quality of volumetric magnetic resonance spectroscopic imaging (MRSI) and to evaluate their ability in detecting metabolic changes with mild injury. ⋯ Although the reduced encoding method is associated with lower signal-to-noise ratio (SNR) that impacts the quality of spectral analysis, the use of the parallel imaging method can lead to the same diagnostic outcomes as the fully sampled data when using the sensitivity-limited volumetric MRSI.