Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1991-08-12
1993-10-05
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
052508994
ABSTRACT:
A method for suppressing fat in a magnetic resonance image of a target organ, wherein fat is present in the vicinity of the target organ involves subjecting the target organ to electromagnetic energy so as to cause an organ signal response and a fat signal response related to the magnetization of the organ and the fat, respectively. The subjecting to electromagnetic energy involves subjecting the target organ to a saturation preamble and thereafter subjecting the target organ to an offsetting spin-echo sequence. The organ and fat responses are detected and image information based on the responses is generated. The saturation preamble, selectively excites and then dephases a particular substance, such as fat, in the vicinity of the target organ. Preferably exciting and then dephasing involves subjecting the target organ to a Hore 1-3-3-1 signal. The subjecting of the target organ to an offsetting spin-echo sequence preferably involves subjecting the target organ to a spin-echo sequence which offsets gradient and spin echoes resulting in a phase difference between the response from the target organ and a response from fat. Signals representative of the offset gradient and spin echoes involves combining such signals, i.e. adding opposing responses together to suppress the fat response.
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Chan Teresa
Listerud John
Mah Raymond Y.
Tokar Michael J.
Trustees of the University of Pennsylvania
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