Apparatus and method for enhanced multiple coil nuclear magnetic

Details Apparatus and method for enhanced multiple coil nuclear magnetic Apparatus and method for enhanced multiple coil nuclear magnetic

1988-08-19

1989-12-05

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

333 32, 330 53, 330286, G01R 3320

Patent

active

048855413

ABSTRACT:
A nuclear magnetic resonance (NMR) signal acquisition apparatus includes a cylindrical array of overlapping coils. Coupling of currents between coils due to re-radiation of received signals, in particular noise currents, is reduced by presenting a high impedance to each coil, thereby reducing the current circulating in each coil. A PREDAMP circuit is disclosed which utilizes the input impedance of a preamplifier, transformed through a quarter-wavelength transmission line segment, to achieve the high input impedance for the coil. As a result, multiple images, each with a high signal-to-noise ratio (SNR), can be simultaneously obtained. A method is disclosed for combining the multiple images into a composite image with optimum SNR, taking into account the phase shifts between the images resulting from the spatial orientation of the coils.

REFERENCES:
patent: 4095168 (1978-06-01), Hlavka
patent: 4593246 (1986-06-01), Hill
patent: 4633181 (1986-12-01), Murphy-Boesch
patent: 4793356 (1988-12-01), Misic et al.

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