Application of variable-rate selective excitation pulses for spin labeling in perfusion MRI
نویسندگان
چکیده
منابع مشابه
Simulations of Perfusion Signals of Pulsed Arterial Spin Labeling MRI
Perfusion is a physiological parameter that refers to the delivery of oxygen and nutrients to tissues via the flow of blood (1). Cerebral blood flow (CBF) is generally quantified in terms of milliliters of blood per gram of tissue per second ml/g/sec (2). Perfusion measurements provide information regarding tissue viability and function, and are therefore of fundamental significance in the fiel...
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Background Arterial spin labeling of the heart has been shown to estimate myocardial perfusion and perfusion reserve at a single short-axis slice for coronary artery disease assessment. However, current spatial labeling methods suffer from transit delay effects when imaging is extended to more than a single slice. Velocity selective (VS) labeling is a promising alternative that does not suffer ...
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PURPOSE Abnormal brain perfusion is a critical mechanism in neonatal brain injury. The aim of the present study was to compare Cerebral Blood Flow (CBF) evaluated with ASL MRI in three groups of neonates: preterms without brain lesions on MRI (PN), preterms with periventricular white matter lesions (PNp) and term neonates with normal MRI (TN). The correlation between CBF and clinical outcome wa...
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INTRODUCTION. Many approaches have been applied to evaluate brain perfusion in neonates: brain ultrasound, near-infrared spectroscopy, and positron emission tomography (PET). However perfusion weighted imaging (PWI) MRI has been shown to enable in vivo direct measurements of brain perfusion in different brain regions. Recent advances have lead to the development of non-contrast agent based Arte...
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The Variable-Rate Selective Excitation (VERSE) technique is shown to improve image quality by reducing fast spin echo spacing and improving slice profile. An algorithm was developed to use VERSE waveform reshaping to minimize echo spacing given specific prescription parameters and system constraints and was implemented for an SSFSE sequence to create shorter RF pulses with higher time•bandwidth...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2010
ISSN: 0740-3194
DOI: 10.1002/mrm.22251