Electricity: measuring and testing – Particle precession resonance – Determine fluid flow rate
Reexamination Certificate
2007-11-13
2007-11-13
Arana, Louis M. (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Determine fluid flow rate
C324S309000, C600S419000
Reexamination Certificate
active
11408090
ABSTRACT:
Disclosed are a method and apparatus for accurately measuring nuclear magnetic resonance (NMR) longitudinal axis relaxation time by minimizing the influence of the amount of blood. The method includes applying a first magnetic field MOto a living body portion into which the blood flows magnetizing the blood in a first direction; applying a second magnetic field MZto at least a portion of the living body portion, to which the first magnetic field MOis applied, magnetizing at least a portion of the blood in a second direction vertical to the first direction;; blocking MZdetecting a signal that is induced as magnetization is returned from the second direction to the first direction; detecting the amount of blood to which the second magnetic field MZis applied; and calculating the longitudinal axis relaxation time T1of the blood based on the induced signal and based on the amount of blood.
REFERENCES:
patent: 5335660 (1994-08-01), Dumoulin
patent: 5363042 (1994-11-01), Dumoulin
patent: 2004/0162483 (2004-08-01), Kimura
Potapov Sergey
Won Jong-hwa
Arana Louis M.
Sughrue Mion Pllc.
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