Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Dec 2015
Improved quantification and mapping of anomalous pulmonary venous flow with four-dimensional phase-contrast MRI and interactive streamline rendering.
Cardiac MRI is routinely performed for quantification of shunt flow in patients with anomalous pulmonary veins, but can be technically-challenging to perform. Four-dimensional phase-contrast (4D-PC) MRI has potential to simplify this exam. We sought to determine whether 4D-PC may be a viable clinical alternative to conventional 2D phase-contrast MR imaging. ⋯ Shunt flow may be reliably quantified with 4D-PC MRI, either indirectly or with detailed delineation of flow from multiple shunts. The 4D-PC may be a more accurate alternative to conventional MRI.
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J Magn Reson Imaging · Dec 2015
Comparative StudyReproducibility of quantitative susceptibility mapping in the brain at two field strengths from two vendors.
To assess the reproducibility of brain quantitative susceptibility mapping (QSM) in healthy subjects and in patients with multiple sclerosis (MS) on 1.5 and 3T scanners from two vendors. ⋯ Brain QSM measurements have good interscanner and same-scanner reproducibility for healthy and MS subjects, respectively, on the systems evaluated in this study.
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J Magn Reson Imaging · Dec 2015
Multicenter StudyWhole-body MRI-DWI for assessment of residual disease after completion of therapy in lymphoma: A prospective multicenter study.
To assess the performance of whole-body MRI including diffusion-weighted imaging (whole-body MRI-DWI) for the detection of residual disease after completion of treatment in lymphoma patients. ⋯ Our initial results suggest that visual whole-body MRI-DWI analysis has a very good sensitivity for detecting viable residual lesions after completion of therapy but lacks specificity. ADC measurements could potentially increase the specificity of whole-body MRI.
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J Magn Reson Imaging · Dec 2015
Comparative StudyComparing tract-based spatial statistics and manual region-of-Interest labeling as diffusion analysis methods to detect white matter abnormalities in infants with hypoxic-Ischemic encephalopathy.
To compare manual region of interest (ROI) labeling and tract-based spatial statistics (TBSS) by their ability to detect group-wise differences in fractional anisotropy (FA) in the neonatal brain. ⋯ Manual ROI labeling and TBSS are comparable methods of diffusion analysis to detect group differences in FA in the neonatal brain.
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J Magn Reson Imaging · Dec 2015
Increased speed and image quality in single-shot fast spin echo imaging via variable refocusing flip angles.
To develop and validate clinically a single-shot fast spin echo (SSFSE) sequence utilizing variable flip angle refocusing pulses to shorten acquisition times via reductions in specific absorption rate (SAR) and improve image quality. ⋯ vrfSSFSE increases speed at 3T over conventional SSFSE via reduced SAR, and when combined with full-Fourier acquisition can improve image quality, although with some increased sensitivity to cardiac motion-related signal loss.