Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Nov 2005
Comparative StudyImplications of pulse sequence in structural imaging of trabecular bone.
To investigate the SNR and image properties of 3D steady-state free precession (SSFP), fast large-angle spin echo (FLASE), gradient-recalled acquisition in steady state (GRASS), and spoiled GRASS (SPGR) for structural imaging of trabecular bone (TB). ⋯ FLASE had the highest SNR and was insensitive to susceptibility dephasing. Although SSFP has superior SNR compared to GRASS, off-resonance effects and duty cycle limitations may compromise its practicality in this application. Inc.
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J Magn Reson Imaging · Nov 2005
Clinical TrialApplication of 3D-MR image registration to monitor diseases around the knee joint.
To estimate the accuracy and consistency of a method using a voxel-based MR image registration algorithm for precise monitoring of knee joint diseases. ⋯ The present method based on an NCC algorithm can be used to register serial MR images of the knee joint with error on the order of a sub-voxel. This method would be useful for precisely assessing therapeutic response and monitoring knee joint diseases; normalized cross-correlation; accuracy.
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J Magn Reson Imaging · Nov 2005
Clinical TrialQuantifying the effect of posture on intracranial physiology in humans by MRI flow studies.
To quantify the effect of posture on intracranial physiology in humans by MRI, and demonstrate the relationship between intracranial compliance (ICC) and pressure (ICP), and the pulsatility of blood and CSF flows. ⋯ The effect of posture on intracranial physiology can be quantified by MRI because posture-related changes in ICC and ICP strongly affect the dynamics of cerebral blood and CSF flows. This study provides important insight into the coupling that exists between arterial, venous, and CSF flow dynamics, and how it is affected by posture.
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J Magn Reson Imaging · Nov 2005
Clinical TrialWash-in rate on the basis of dynamic contrast-enhanced MRI: usefulness for prostate cancer detection and localization.
To evaluate the usefulness of the wash-in rate based on dynamic contrast-enhanced (DCE) MRI for the detection and localization of prostate cancer. ⋯ The wash-in rate based on DCE-MRI is a useful parameter for prostate cancer detection and localization.
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J Magn Reson Imaging · Nov 2005
Multicenter Study Controlled Clinical TrialTexture analysis for tissue discrimination on T1-weighted MR images of the knee joint in a multicenter study: Transferability of texture features and comparison of feature selection methods and classifiers.
To investigate the reproducibility and transferability of texture features between MR centers, and to compare two feature selection methods and two classifiers. ⋯ The differences in texture features extracted from MR images from different centers seem to have only a small impact on the results of tissue discrimination.