NMR imaging method

Details NMR imaging method NMR imaging method

1988-03-14

1989-07-04

Smith, Ruth S.

Surgery

Truss

Pad

324306, 324309, A61B 505

Patent

active

048440779

ABSTRACT:
A slice selection gradient magnetic field used in a pulse sequence for generating a spin echo signal is applied in such a fashion that its polarity at the time of a 90.degree. pulse becomes opposite to the one at the time of 180 .degree. pulse, in order to expand a dynamic range of blood flow speed measurement. When the blood flow speed contains a component in a slice vertical direction, the gradient magnetic field in the slice vertical direction is adjusted so that the phase changes of two sets of flow encoded pulses contained in the slice vertical direction are opposite to each other.
The flow speed in the direction of the readout gradient magnetic field, which is a lateral direction of the slice plane, is purely measured by cancelling influences of the flow in the slice vertical direction.

REFERENCES:
patent: 4384255 (1983-05-01), Young et al.
patent: 4451788 (1984-05-01), Edelstein et al.
patent: 4516582 (1985-05-01), Redington
patent: 4532473 (1985-07-01), Wehrli
patent: 4595879 (1986-06-01), Lent et al.
patent: 4683431 (1987-07-01), Pattany et al.

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