Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Apr 2016
Rates of safety incident reporting in MRI in a large academic medical center.
To describe our multiyear experience in incident reporting related to magnetic resonance imaging (MRI) in a large academic medical center. ⋯ MRI-related incident reports are relatively infrequent, occur at significantly higher rates in inpatients, and usually do not result in patient harm. Diagnostic test orders, adverse drug reactions, and medication/IV safety were the most frequent safety incidents.
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J Magn Reson Imaging · Apr 2016
Detection of pulmonary embolism with free-breathing dynamic contrast-enhanced MRI.
To evaluate the use of dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) during free breathing for the detection of acute pulmonary embolism (PE). ⋯ Free-breathing DCE MRI may have potential use for the assessment of PE, and does not require patient cooperation in breath-holding.
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J Magn Reson Imaging · Apr 2016
Fully automatic analysis of the knee articular cartilage T1ρ relaxation time using voxel-based relaxometry.
To develop and compare with the classical region of interest (ROI)-based approach a fully automatic, local, and unbiased way of studying the knee T1ρ relaxation time by creating an atlas and using voxel-based relaxometry (VBR) in osteoarthritis (OA) and anterior cruciate ligament (ACL) subjects. ⋯ ROI-based results from atlas-based segmentation were consistent with classical ROI-based method (coefficient of variation [CV] = 3.83%). Voxel-based group analysis revealed local patterns that were overlooked by the ROI-based approach; eg, VBR showed posterior lateral femur and posterior lateral tibia significant T1ρ elevations in ACL-injured patients (sample mean z-score=9.7 and 10.3). Those elevations were overlooked by the classical ROI-based approach (sample mean z-score=1.87 and -1.73) CONCLUSION: VBR is a feasible and accurate tool for the local evaluation of the biochemical composition of knee articular cartilage. VBR is capable of detecting specific local patterns on T1ρ maps in OA and ACL subjects.
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J Magn Reson Imaging · Apr 2016
Noise robust spatially regularized myelin water fraction mapping with the intrinsic B1-error correction based on the linearized version of the extended phase graph model.
To improve the quantification accuracy of transverse relaxometry by accounting for B1 -error, after minimizing slice profile imperfections. ⋯ The proposed method resulted in more accurate and noise robust myelin water fraction maps with improved depiction of subcortical WM structures.