Imaging systems

Details Imaging systems Imaging systems

1980-01-11

1981-12-22

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324309, G01N 2700

Patent

active

043073441

ABSTRACT:
In a nuclear magnetic resonance imaging apparatus it has been proposed to excite resonance preferentially in a cross-sectional slice of a patient's body by applying a field gradient pulse in conjunction with a pulse of RF. It has been found that the shape of the RF pulse envelope can be chosen to reduce excitation outside the chosen slice. It is proposed that the RF envelope should be a unidirectional pulse of which both the rising and falling parts are monotonic curves lying between limits given by sin.sup.3 t and sin.sup.10 t curves, preferably sin.sup.5 t. An acceptable curve may fall below sin.sup.10 t in the skirts but should not change sign.

REFERENCES:
patent: 4021726 (1977-05-01), Garroway et al.
patent: 4045723 (1977-08-01), Ernst
R. Sutherland, "Three-Dimensional NMR Imaging Using Selective Excitation," J. Phys., E: Sci. Instrum, vol. 11, No. 1, 1978, pp. 79-83.
J. M. S. Hutchison, "NMR Imaging: Image Recovery Under Magnetic Fields with Large Non-Uniformities", J. Phys., E; Sci. vol. 11, 1978, pp. 217-221.

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