Journal of magnetic resonance imaging : JMRI
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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.
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J Magn Reson Imaging · Nov 2006
Respiratory-triggered MRCP applying parallel acquisition techniques.
To evaluate the influence of parallel imaging on the image quality of respiratory triggered magnetic resonance cholangiopancreatography (MRCP). ⋯ The application of parallel imaging for respiratory triggered MRCP significantly reduces the acquisition time without relevant influence on image quality.
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J Magn Reson Imaging · Nov 2006
Brain hydrodynamics study by phase-contrast magnetic resonance imaging and transcranial color doppler.
To evaluate the contributions of phase-contrast magnetic resonance (PCMR) and transcranial color Doppler (TCCD) imaging in the investigation of cerebral hydrodynamics. ⋯ PCMR imaging provides complementary information to TCCD to assess various intracranial parameters such as instantaneous velocities, blood and CSF flow distributions, volume variation, or pressure regulation mechanisms during cardiac cycles.
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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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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.