Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Dec 2011
Impact of partial volume effects on visceral adipose tissue quantification using MRI.
To quantitatively estimate the impact of partial volume effects on visceral adipose tissue (VAT) quantification using typical resolution magnetic resonance imaging (MRI). ⋯ PV fat contributes a significant amount of fat to fat measurements on typical spatial resolution MRI on normal and overweight subjects. The relative PV fat contribution is markedly higher in slimmer patients. Inclusion of this portion of the adipose tissue will increase overall accuracy and decrease variability of VAT quantification using MRI.
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To develop an approach to vascular access under magnetic resonance imaging (MRI), as a component of comprehensive MRI-guided cardiovascular catheterization and intervention. ⋯ MRI-guided access to central veins is feasible in our animal model. When image guidance is necessary for vascular access, performing this component under MRI will allow wholly MRI-guided catheterization procedures that do not require adjunctive imaging facilities such as x-ray or ultrasound. The active needle design showed enhanced visibility, as expected. These capabilities may permit more complex catheter-based cardiovascular interventional procedures enabled by enhanced image guidance.
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J Magn Reson Imaging · Oct 2011
Comparative StudyNovel segmentation method for abdominal fat quantification by MRI.
To introduce and describe the feasibility of a novel method for abdominal fat segmentation on both water-saturated and non-water-saturated MR images with improved absolute fat tissue quantification. ⋯ The proposed method using a novel fuzzy c-means clustering method followed by thresholding can achieve consistent quantitative results on both WS and NWS abdominal MR images while accounting for PVE contributing inaccuracies.
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J Magn Reson Imaging · Oct 2011
Comparative StudyThe application of three-dimensional diffusion-weighted PSIF technique in peripheral nerve imaging of the distal extremities.
To evaluate whether the addition of the three-dimensional diffusion-weighted reversed fast imaging with steady state free precession (3D DW-PSIF) sequence improves the identification of peripheral nerves in the distal extremities. ⋯ The 3D DW-PSIF images provide improved identification of the nerves compared with the T2-weighted images, and should be incorporated in the MRN protocol, whenever accurate nerve localization and/or presurgical evaluation are required.
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J Magn Reson Imaging · Oct 2011
Comparative StudyAutomatic abdominal fat assessment in obese mice using a segmental shape model.
To develop a computerized image analysis method to assess the quantity and distribution of abdominal fat tissues in an obese (ob/ob) mouse model relevant to 7 T magnetic resonance imaging (MRI). ⋯ The automated results correlate well with manual segmentations and the method can be used to increase laboratory automation.