Fluid measurement method using nuclear magnetic resonance imagin

Details Fluid measurement method using nuclear magnetic resonance imagin Fluid measurement method using nuclear magnetic resonance imagin

1994-09-01

1997-11-04

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Determine fluid flow rate

1286533, G01R 33563, A61B 50265

Patent

active

056843984

ABSTRACT:
A bolus of magnetized blood is formed by at least two radio frequency magnetic fields, and readout gradient magnetic fields are repeatedly applied at a proportion of 1:-2:1 along a blood vessel so as to continuously obtain a first echo signal whose phase change due to velocity is corrected, from the moving bolus. This first echo signal provides velocity information on the blood stream. The sequence of the readout gradient magnetic fields is repeatedly applied at a proportion of (.sqroot.2-1):-2:2:-(.sqroot.2-1) so as to continuously obtain a second echo signal whose phase change due to velocity and acceleration is corrected, from the moving bolus. Acceleration information of the blood stream is extracted by calculating the difference between the first echo signal and the second echo signal. The velocity information and/or the acceleration information is displayed in superposition with a specific blood vessel of an angiogram shot in advance.

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Lenz et al, Radiology 166:875 (1988): pp. 875-882.

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