Homodyne detection in magnetic resonance imaging

Magnetic detection of complex images in magnetic resonance imaging (MRI) is immune to the effects of incidental phase variations, although in some applications information is lost or images are degraded. It is suggested that synchronous detection or demodulation can be used in MRI systems in place o...

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Bibliographic Details
Published in:IEEE transactions on medical imaging 1991-06, Vol.10 (2), p.154-163
Main Authors: Noll, D.C., Nishimura, D.G., Macovski, A.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Degradation
Demodulation
Envelope detectors
Image reconstruction
Investigative techniques, diagnostic techniques (general aspects)
Lipidomics
Magnetic resonance imaging
Medical sciences
Noise level
Noise reduction
Phase detection
Signal detection
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Summary:Magnetic detection of complex images in magnetic resonance imaging (MRI) is immune to the effects of incidental phase variations, although in some applications information is lost or images are degraded. It is suggested that synchronous detection or demodulation can be used in MRI systems in place of magnitude detection to provide complete suppression of undesired quadrature components, to preserve polarity and phase information, and to eliminate the biases and reduction in signal-to-noise ratio (SNR) and contrast in low SNR images. The incidental phase variations in an image are removed through the use of a homodyne demodulation reference, which is derived from the image or the object itself. Synchronous homodyne detection has been applied to the detection of low SNR images, the reconstruction of partial k-space images, the simultaneous detection of water and lipid signals in quadrature, and the preservation of polarity in inversion-recovery images.< >
ISSN:0278-0062
1558-254X
DOI:10.1109/42.79473