Journal of magnetic resonance imaging : JMRI
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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.
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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.
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J Magn Reson Imaging · Nov 2006
Automated perfusion-weighted MRI using localized arterial input functions.
To investigate the utility of an automated perfusion-weighted MRI (PWI) method for estimating cerebral blood flow (CBF) based on localized arterial input functions (AIFs) as compared to the standard method of manual global AIF selection, which is prone to deconvolution errors due to the effects of delay and dispersion of the contrast bolus. ⋯ Automated CBF calculation using local AIFs is feasible and appears to produce more useful CBF maps.
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J Magn Reson Imaging · Nov 2006
Rapid fat suppression in MRI of the breast with short binomial pulses.
To develop a faster method of fat suppression for use in dynamic contrast enhanced MRI of the breast. ⋯ Rapid binomial pulses can be used for dynamic contrast enhanced breast MRI with excitation times significantly shorter than currently used fat suppression pulses. Shorter excitation time allows more rapid imaging, allowing greater temporal and spatial resolution for characterization of breast lesions.
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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.