𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Real-Time Functional Magnetic Resonance Imaging

✍ Scribed by Robert W. Cox; Andrzej Jesmanowicz; James S. Hyde

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
663 KB
Volume
33
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

A recursive algorithm suitable for functional magnetic resonance imaging (FMRI) calculations is presented. The correlation coefficient of a time course of images with a reference time series, with the mean and any linear trend projected out, may be computed with 22 operations per voxel, per image; the storage overhead is four numbers per voxel. A statistical model for the FMRI signal is presented, and thresholds for the correlation coefficient are derived from it. Selected images from the first real‐time functional neuroimaging experiment (at 3 Tesla) are presented. Using a 50‐MHz workstation equipped with a 14‐bit analog‐to‐digital converter, each echo planar image was acquired, reconstructed, correlated, thresh‐olded, and displayed in pseudocolor (highlighting active regions in the brain) within 500 ms of the RF pulse.

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