Quantifying CBF with pulsed ASL: Technical and pulse sequence factors
نویسندگان
چکیده
منابع مشابه
Quantifying CBF with pulsed ASL: technical and pulse sequence factors.
We summarize here current methods for the quantification of CBF using pulsed arterial spin labeling (ASL) methods. Several technical issues related to CBF quantitation are described briefly, including transit delay, signal from larger arteries, radio frequency (RF) slice profiles, magnetization transfer, tagging efficiency, and tagging geometry. Many pulsed tagging schemes have been devised, wh...
متن کاملQuantifying CBF with arterial spin labeling.
The basic principles of measuring cerebral blood flow (CBF) using arterial spin labeling (ASL) are reviewed. The measurement is modeled by treating the ASL method as a magnetic resonance imaging (MRI) version of a microsphere study, rather than a diffusible tracer study. This approach, particularly when applied to pulsed ASL (PASL) experiments, clarifies that absolute calibration of CBF primari...
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ASL 42.5 21.9 Single GRE 44.0 20.4 0.78 0.64 Single SE 41.9 20.2 0.75 0.52 ΔR2 45.5 19.6 0.76 0.74 ΔR2 43.9 19.9 0.76 0.60 Tab. 2. Summary of the relation between ASL CBF and PWI CBF values in gray and white matter (upon normalization of median PWI CBF values to median ASL CBF). The whole brain median CBF was 35.5 ml/100g/min. Column 4 relates to red lines, and column 5 relates to green lines i...
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INTRODUCTION: Hemodynamic assessment of patients who have steno-occlusive cerebrovasucular disease plays an important role for decision making and planning of surgical interventions. In this field, SPECT is currently the modality of choice, but faster and less invasive techniques are highly desirable. Arterial spin labeling (ASL) is emerging as clinically promising technique for non-invasive pe...
متن کاملOptimizing the inversion efficiency of pseudo-continuous ASL pulse sequence using B0 field map information
Introduction: The recent introduction of pseudo-continuous inversion pulses (pCASL) has the potential to greatly facilitate the use of continuous Arterial Spin Labeling (ASL) (1). However, field inhomogeneities, can compromise the inversion efficiency of pCASL, which causes loss in SNR and severe quantification error (2). We propose a method to restore the loss in inversion efficiency by correc...
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ژورنال
عنوان ژورنال: Journal of Magnetic Resonance Imaging
سال: 2005
ISSN: 1053-1807,1522-2586
DOI: 10.1002/jmri.20459