Methods for measurement of longitudinal spin relaxation times in

Details Methods for measurement of longitudinal spin relaxation times in Methods for measurement of longitudinal spin relaxation times in

1993-08-12

1994-11-08

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Determine fluid flow rate

324309, G01V 300

Patent

active

053630424

ABSTRACT:
A magnetic resonance imaging system employs a sequence of radio frequency pulses and magnetic field gradients to detect and measure the spin-relaxation time of moving blood within a subject. Spin-lattice relaxation times are determined by first inverting longitudinal spin magnetization and then detecting the recovery of this magnetization with a series of detection radio frequency pulses. The inversion pulse is applied to the entire subject, but the detection pulses are applied only to a selection portion of the subject. Blood motion causes the blood in the detection region to be replaced for each detection pulse, thereby increasing the accuracy of the measurement and permitting the use of multiple detection pulses after a single inversion pulse. In-vivo application of this invention can be used to assess renal function in individual kidneys.

REFERENCES:
patent: 5133357 (1992-07-01), Dumoulin et al.
patent: 5233298 (1993-08-01), Dumoulin
patent: 5309099 (1994-05-01), Irarrazabal et al.
Proceedings of the Eleventh Annual Meeting of the Society of Magnetic Resonance in Medicine, by Campeau, et al, p. 434, Aug. 1992.
Numerical Recipes in Fortran, The Art of Scientific Computing, William Press, et al, pp. 678-683, 1992. (month of pub. unknown).

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