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US 5,451,876 AGranted
MRI system with dynamic receiver gain
AssigneeGeneral Electric Company
InventorsLorraine V. Sandford, Joseph K. Maier, Robert S. Stormont
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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.
Claims6
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,.theta.), 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,.theta.) 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.
3 more elements
Dependencies are inferred from the claim text.