Electricity: measuring and testing – Particle precession resonance – Determine fluid flow rate
Patent
1994-07-29
1996-06-18
Snow, Walter E.
Electricity: measuring and testing
Particle precession resonance
Determine fluid flow rate
324307, 324309, G01V 300
Patent
active
055281443
ABSTRACT:
An examination region (34) is divided into a multiplicity of slices, e.g. slices 1-20. The slices are divided up into groups or slabs, e.g., slabs I-V. A series of magnetization inversion pulses (70.sub.I- 70.sub.V) and slab select gradient pulses (74.sub.I -74.sub.V) are applied at regular intervals. At a duration after each slab inversion at which the magnetization of a material such as CSF is at a minimum or null (80) marks a center of a data acquisition period (84). A plurality of imaging sequences (82) are conducted in each data acquisition period. Each of the imaging sequences collects one or more data lines from each of the slices within the corresponding slab. This process is repeated cyclically until all of the data lines of each slice of each slab have been collected. The data lines are reconstructed (102) into an image representation which is stored in an image memory (104) for selective display on a video monitor (108).
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"Use of Fluid Attenuated Inversion Recovery (FLAIR) Pulse Sequences in MRI of the Brain", Hajnal, et al., Journal of Computer Assisted Tomography, 16(6); 841-844, Nov./Dec. 1992.
Gullapalli Rao P.
Hajnal Joseph V.
Kasuboski Larry
Liu Haiying
Haynes Mack
Picker International Inc.
Snow Walter E.
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