Journal of magnetic resonance imaging : JMRI
-
J Magn Reson Imaging · Dec 2006
Dual-bolus approach to quantitative measurement of pulmonary perfusion by contrast-enhanced MRI.
To evaluate a dual-bolus approach to pulmonary perfusion MRI. ⋯ A dual-bolus approach to pulmonary perfusion MRI is feasible and may reduce the problem of lacking linear relationship between the contrast-agent concentration and signal intensity.
-
J Magn Reson Imaging · Dec 2006
Mapping activation levels of skeletal muscle in healthy volunteers: an MRI study.
To use muscle functional MRI (mfMRI) to compare activation levels within and among triceps surae (TS) muscles. ⋯ There is substantial variation in the level of activation within and among the TS muscles; however, the activation level is mainly in the moderate to low range in all three muscles.
-
J Magn Reson Imaging · Nov 2006
Correction of eddy-current distortions in diffusion tensor images using the known directions and strengths of diffusion gradients.
To correct eddy-current artifacts in diffusion tensor (DT) images without the need to obtain auxiliary scans for the sole purpose of correction. ⋯ The proposed algorithm can accurately correct eddy-current artifacts in DT images. Its principal advantages are that only images with comparable signals and contrasts are cross-correlated, and no additional scans are required.
-
To improve the tag persistence throughout the whole cardiac cycle by providing a constant tag-contrast throughout all the cardiac phases when using balanced steady-state free precession (bSSFP) imaging. ⋯ The tag persistence was significantly improved when the proposed method was applied, with better Tag-CNR during the diastolic cardiac phase. The improved Tag-CNR will support automated tagging analysis and quantification methods.
-
J Magn Reson Imaging · Nov 2006
Quantification of distal antral contractile motility in healthy human stomach with magnetic resonance imaging.
To quantify healthy postprandial: 1) propagation, periodicity, geometry, and percentage occlusion by distal antral contraction waves (ACWs); and 2) changes in ACW activity in relationship to gastric emptying (GE). ⋯ Our results indicate that ACWs are not imperative for emptying of liquids. This study provides a detailed quantitative reference for MRI inquiries into pharmacologically- and pathologically-altered gastric motility.