Method of NMR imaging with off-center zoom scan

Details Method of NMR imaging with off-center zoom scan Method of NMR imaging with off-center zoom scan

1983-11-25

1986-06-03

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3322

Patent

active

045932476

ABSTRACT:
In Fourier transform NMR imaging, magnified images free of aliasing artifacts are achieved by band limiting the NMR signal in the X- and Y-axes directions thereby avoiding under-sampling. Band limiting in the X-axis direction is accomplished by reducing the signal bandwith by a low-pass filter before A/D conversion. In the Y-axis direction, the signal is band limited by providing selective excitation of the spin isochromats, such that only spins in a selected Y region of the object are available to contribute to the signal. When the region of interest is not centered, offsets in the X- and Y-axes directions are obtained by shifting the receiver frequency by an amount .DELTA.f.sub.R, and causing the selective RF pulse to have a complex amplitude.

REFERENCES:
patent: 4297637 (1981-10-01), Crooks
patent: 4443760 (1984-04-01), Edelstein
patent: 4484138 (1984-11-01), Bottomley
patent: 4506223 (1985-03-01), Bottomley
Proceedings of an International Symposium on NMR Imaging-(Oct. 1-3, 1981) "NMR Scanning: The Spin Warp Method", James Hutchison, pp. 77-80.
Proceedings of an International Symposium on NMR Imaging-(Oct. 1-3, 1981) "NMR Imaging at 5.1 MHz: Work in Progress", Edelstein, pp. 139-145.

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