Journal of magnetic resonance imaging : JMRI
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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
Age-independent myocardial infarct quantification by signal intensity percent infarct mapping in swine.
To test whether signal intensity percent infarct mapping (SI-PIM) accurately determines the size of myocardial infarct (MI) regardless of infarct age. ⋯ Our results indicate that the SI-PIM method can accurately determine MI volume regardless of the pathological stage of MI. Once tested, it may prove to be useful for the clinic.
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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
Imaging of the lumbar plexus: Optimized refocusing flip angle train design for 3D TSE.
To study the effects of refocusing angle modulation with 3D turbo spin echo (TSE) on signal and sharpness of small oblique nerves embedded in muscle and suppressed fat in the lumbar plexus. ⋯ An optimized flip angle train in 3D TSE imaging of the lumbar plexus considering geometry-specific blurring effects from both the nerve and the surrounding tissue can improve the delineation of small nerves.
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J Magn Reson Imaging · Apr 2016
Characterization of breast masses as benign or malignant at 3.0T MRI with whole-lesion histogram analysis of the apparent diffusion coefficient.
To investigate the utility of whole-lesion apparent diffusion coefficient (ADC) histogram analysis in capturing breast lesion heterogeneity and determine which ADC metric may help best differentiate benign from malignant breast mass lesions at 3.0T magnetic resonance imaging (MRI). ⋯ These results suggest that whole-lesion ADC histogram analysis may facilitate the differentiation between benign and malignant breast mass lesions.