System and method for filtering frequency encoded imaging signals
AssigneeGE Medical Systems Global Technology Company, LLC
InventorsJames Nengjie Zhang, Chris J. Gilling, Kevin Scott Kreger
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Abstract
A method of filtering frequency encoded imaging signals includes receiving the frequency encoded imaging signals in the time domain and demodulating the frequency encoded imaging signals. The method further includes upsampling the frequency encoded imaging signals by an integer upsampling factor, reducing the bandwidth of the frequency encoded imaging signals, and downsampling the frequency encoded imaging signals by an integer downsampling factor. The frequency encoded imaging signals are resampled by a resampling factor substantially equal to the integer upsampling factor divided by the integer downsampling factor.
Claims21
A method of filtering frequency encoded imaging signals having a bandwidth, the frequency encoded imaging signals used to reconstruct an image, comprising:
- receiving the frequency encoded imaging signals in the time domain;
- demodulating the frequency encoded imaging signals in the time domain;
- upsampling the frequency encoded imaging signals in the time domain by an integer upsampling factor;
- reducing the bandwidth of the frequency encoded imaging signals in the time domain;
- and
- downsampling the frequency encoded imaging signals in the time domain by an integer downsampling factor, whereby the frequency encoded imaging signals are resampled by a resampling factor substantially equal to the integer upsampling factor divided by the integer downsampling factor.
A digital filter for filtering magnetic resonance imaging (MRI) signals used to reconstruct an image, comprising:
- a quadrature demodulator configured to receive the MRI signals and to demodulate the MRI signals, wherein the quadrature demodulator operates in the time domain;
- a filter configured to reduce the time domain bandwidth of the MRI signals;
- and
- a resampler configured to receive the MRI signals and to resample the MRI signals, wherein the resampler is configured to resample the MRI signals based on a selected one of a plurality of fractional resampling factors having different integer upsampling factors, wherein the resampler operates in the time domain.
A method of filtering frequency encoded imaging signals used to reconstruct an image, comprising:
- resampling the imaging signals in the time domain by an integer upsampling factor and an integer downsampling factor;
- and
- applying filter coefficients to the imaging signals in the time domain to generate output signals having a reduced bandwidth, wherein a first subset of the filter coefficients is applied to the imaging signals to generate a first output signal and a second subset of the filter coefficients is applied to the imaging signals to generate a second output signal.
Dependencies are inferred from the claim text.