Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Mar 2006
Partial-volume model for determining white matter and gray matter cerebral blood volume for analysis of gliomas.
To model the partial voluming of gray matter (GM) and white matter (WM) in perfusion imaging, and to use this model to estimate the cerebral blood volume (CBV) of pure WM and GM, which could then be used to normalize data across patients in preparation for analyzing tumor perfusion. ⋯ A partial-volume model is demonstrated for estimating pure WM and GM CBV. It is also shown that the relationship between the tumor CBV as estimated with this model is generally consistent with expectations based on spectroscopy and imaging.
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J Magn Reson Imaging · Mar 2006
Quantitative myocardial infarction on delayed enhancement MRI. Part I: Animal validation of an automated feature analysis and combined thresholding infarct sizing algorithm.
To develop a computer algorithm to measure myocardial infarct size in gadolinium-enhanced magnetic resonance (MR) imaging and to validate this method using a canine histopathological reference. ⋯ The FACT algorithm accurately measured MI size on delayed enhancement MR imaging in vivo and ex vivo. The FACT algorithm was also more accurate than human manual contouring and simple intensity thresholding approaches.
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J Magn Reson Imaging · Mar 2006
Gastric motor function and emptying in the right decubitus and seated body position as assessed by magnetic resonance imaging.
To determine the effect of the right decubitus lying body position (RP) on relevant parameters of human gastric motor function in healthy volunteers. ⋯ Gastric MRI in RP is feasible for clinical research assessing gastric motor function. The subtle difference in meal emptying may be induced by posture-dependent vagal activity. This study confirms that MRI is a highly sensitive imaging technique for assessing gastrointestinal function in humans.
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J Magn Reson Imaging · Mar 2006
Comparative StudyPulsed arterial spin labeling parameter optimization for an elderly population.
To optimize pulsed arterial spin labeling (PASL) parameters for the elderly to take into account possible perfusion changes that occur in the brain with age. ⋯ For acquiring perfusion-weighted images with minimal intravascular signal and adequate tissue signal for PASL studies of cerebral perfusion in the elderly, a longer inversion time is advantageous.
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J Magn Reson Imaging · Mar 2006
Improved temporal clustering analysis method for detecting multiple response peaks in fMRI.
To develop an improved temporal clustering analysis (TCA) method for detecting multiple active peaks by running the method once. ⋯ The new method is effective in detecting multiple activations even when the timing and location of the brain activation are completely unknown.