PMID: 9430347Jun 1, 1997Paper

Multi-slice perfusion-based functional MRI using the FAIR technique: comparison of CBF and BOLD effects

NMR in Biomedicine
S G KimJ Ashe

Abstract

Perfusion-weighted imaging techniques employing blood water protons as an endogenous tracer have poor temporal resolution because each image should be acquired with an adequate spin 'tagging' time. Thus, perfusion-based functional magnetic resonance imaging studies are typically performed on a single slice. To alleviate this problem, a multi-slice flow-sensitive alternating inversion recovery technique has been developed. Following a single inversion pulse and a delay time, multi-slice echo-planar images are acquired sequentially without any additional inter-image delay. Thus, the temporal resolution of multi-slice FAIR is almost identical to that of single slice techniques. The theoretical background for multi-slice FAIR is described in detail. The multi-slice FAIR technique has been successfully applied to obtain three-slice cerebral blood flow based functional images during motor tasks. The relative CBF change in the contralateral motor/sensory area during unilateral thumb-digit opposition is 45.0+/-12.2% (n=9), while the blood oxygenation level dependent signal change is 1.5+/-0.4 SD%. Relative changes of the oxygen consumption rate can be estimated from CBF and BOLD changes using FAIR. The BOLD signal change is not correla...Continue Reading

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Citations

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