Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1998-04-17
2000-01-18
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, 324311, G01V 300
Patent
active
060160578
ABSTRACT:
A system and method for improved water and fat separation in magnetic resonance imaging (MRI) is disclosed using a set of low-resolution images to correct phase errors with overall reduced scan time and post-processing time and enhanced reliability. Several embodiments are disclosed whereby reliable water and fat separation is achieved in nearly one NEX, Two NEX, or Three NEX regular imaging times. In the one embodiment, a regular image data set having water and fat phase-shifted by 90.degree. is acquired, along with two low-resolution image data sets where water and fat are phase-shifted by 0.degree. and 180.degree. are acquired. In another embodiment, two regular image data sets having water and fat phase-shifted by 0.degree. and 180.degree. are acquired, and a low-resolution imaging data set having water and fat phase-shifted by 90.degree. is acquired. In post-processing, three low-resolution images are reconstructed and the phase factors for all the pixels with appreciable amounts of both water and fat are determined. For pixels with a single spectral component or low SNR, phase factors are obtained in a region-growing process designed specifically to ensure spatial phase continuity. Once the low-resolution phase factors are available, they are used either for correcting the phase errors in the regular image in the One NEX embodiment, or for guiding a binary choice between two possible solutions from the two regular images in the Two NEX embodiment. Other embodiments are also disclosed herein besides a reduction in scan time, the image processing time is also reduced in the proposed technique due to the use of images with reduced matrix size, increased SNR, and fewer pixels with single spectral component.
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Cabou Christian G.
General Electric Company
Oda Christine K.
Price Phyllis Y.
Shrivastav Brij B.
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