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
T1-weighted 3D dynamic contrast-enhanced MRI of the breast using a dual-echo Dixon technique at 3 T.
To evaluate a single-pass fast spoiled gradient echo (FSPGR) two-point Dixon sequence and a gradient echo sequence with spectral fat suppression in their performance at 3 T for fat suppressed contrast-enhanced bilateral breast imaging. ⋯ Our findings suggest that the Dixon technique is an effective fat suppression method for contrast-enhanced breast MRI. The Dixon technique also seemed to provide better anatomical definition of posterior structures and improvement in severity of artifacts.
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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.
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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.