MRI system with dynamic receiver gain
First Claim
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1. In an NMR system a method for reconstructing an image from a plurality of acquired NMR signals, the steps comprising:
- a) storing a normalization table comprised of a plurality of amplitude and phase corrections (A,θ
), each of the amplitude and phase corrections being associated with one of a corresponding plurality of receiver attenuation values (RA);
b) acquiring one of said NMR signals with a receiver whose gain is set by one of said receiver attenuation values (RA);
c) normalizing the acquired NMR signal by altering its amplitude and phase by an amount determined by the amplitude and phase corrections (A,θ
) in the normalization table associated with said one of said receiver attenuation values (RA);
d) repeating steps b) and c) to acquire further NMR signals with the receiver gain set by different ones of said receiver attenuation values (RA); and
e) reconstructing an image using the normalized, acquired NMR signals.
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Abstract
An NMR system includes a transceiver which receives NMR signals of varying amplitude during a scan. The gain of the receiver is dynamically changed during the scan to provide an optimal SNR figure without overranging the transceiver'"'"'s A/D converter. The acquired NMR signals are normalized prior to image reconstruction using correction factors for gain and phase stored in a normalization table.
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Citations
6 Claims
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1. In an NMR system a method for reconstructing an image from a plurality of acquired NMR signals, the steps comprising:
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a) storing a normalization table comprised of a plurality of amplitude and phase corrections (A,θ
), each of the amplitude and phase corrections being associated with one of a corresponding plurality of receiver attenuation values (RA);b) acquiring one of said NMR signals with a receiver whose gain is set by one of said receiver attenuation values (RA); c) normalizing the acquired NMR signal by altering its amplitude and phase by an amount determined by the amplitude and phase corrections (A,θ
) in the normalization table associated with said one of said receiver attenuation values (RA);d) repeating steps b) and c) to acquire further NMR signals with the receiver gain set by different ones of said receiver attenuation values (RA); and e) reconstructing an image using the normalized, acquired NMR signals. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification