Methods of producing image information from objects

Details Methods of producing image information from objects Methods of producing image information from objects

G - Physics

01

R

324/1

G01R 33/561 (2006.01) G01R 33/54 (2006.01)

Patent

CA 1147807

ABSTRACT METHODS OF PRODUCING IMAGE INFORMATION FROM OBJECTS To produce image information from an object it is subjected to a continuous static magnetic field along a Z axis and to sets of sequences of gradient Gx, Gy and Gz to the magnetic field. Spins in a selected plane (the X-Z plane) are excited by selective rf pulses and an associated Gy gradient and the selected spins are subjected to a reversed Gy gradient together with a Gx gradient. The Gy gradient is then switched off and the direction of the Gx gradient is then repeatedly reversed. During the action of reversal of the Gx gradient a small Gz gradient is provided. Each reversed Gx gradient is held constant for a sufficient time for a free induction decay signal to be generated thus providing a multiple echo of the spins in the selected plane. Alternate signals are time-reversed and then both the time-reversed and non time-reversed signals are subject to Fourier transformation.

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