Journal of magnetic resonance imaging : JMRI
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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
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
Swallowing, arterial pulsation, and breathing induce motion artifacts in carotid artery MRI.
To identify and quantify the potential sources of motion in carotid artery imaging. ⋯ Pulsation, breathing, and swallowing are sources of significant motion in the carotid artery wall. Such motion should be considered in the future to improve carotid artery image quality.
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J Magn Reson Imaging · Feb 2006
Comparative StudyProton magnetic resonance spectroscopic imaging to differentiate between nonneoplastic lesions and brain tumors in children.
To investigate whether in vivo proton magnetic resonance spectroscopic imaging (MRSI) can differentiate between 1) tumors and nonneoplastic brain lesions, and 2) high- and low-grade tumors in children. ⋯ Proton MRSI may have a promising role in differentiating pediatric brain lesions, and an important diagnostic value, particularly for inoperable or inaccessible lesions.