Electricity: measuring and testing – Particle precession resonance – Determine fluid flow rate
Patent
1992-11-25
1994-03-29
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Determine fluid flow rate
G01R 3320
Patent
active
052988619
ABSTRACT:
A magnetic resonance imaging method capable of discriminating the flow directions of fluids, such as bloodstreams, and suitable for MR angiography first selectively excites two side regions, which are located in the vicinity of a region to be imaged including fluids in an object to be examined, and which include first and second fluids flowing into the region to be imaged along different directions, by using RF pulses (90.degree. pulses) different from each other in phase by 90.degree.. A spin in one side region is rotated to the x'-axis direction in a rotating coordinate system, and that in the other side region is rotated to the y'-axis direction in the system. A 180.degree. pulse is applied to the region to be imaged to invert the polarity of a spin, thereby generating MR signals. The acquired MR signals are subjected to quadrature detection, and MR images are reconstructed for both a real-part component and an imaginary-part component different from each other in phase by 90.degree.. In each of the two images, only a fluid flowing in one direction appears. The flow directions of the fluids can be discriminated by comparing the two images.
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Kabushiki Kaisha Toshiba
Tokar Michael J.
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