Magnetic resonance method of measuring kidney filtration rates

Details Magnetic resonance method of measuring kidney filtration rates Magnetic resonance method of measuring kidney filtration rates

1993-08-12

1994-08-09

Smith, Ruth S.

Surgery

Truss

Pad

1286534, A61B 5055

Patent

active

053356608

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: 4893627 (1990-01-01), Kehayias et al.
Proceedings of the Eleventh Annual Meeting of the Society of Magnetic Resonance in Medicine, by Campeau, et al, p. 434, 1992.
Numerical Recipes in Fortran, The Art of Scientific Computing, William Press, et al, pp. 678-683, 1992.

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