Multi-view coil bandpass filter array system

Details Multi-view coil bandpass filter array system Multi-view coil bandpass filter array system

1992-02-28

1993-09-28

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324312, 324 7641, G01R 3320

Patent

active

052489434

ABSTRACT:
An MRI signal processing apparatus is disclosed which provides a low noise output signal for use in a multi-coil MRI system, wherein each sensing coil provides an input signal to the MRI signal processing apparatus. The apparatus includes input mixer circuitry for frequency shifting each input channel from a first frequency range to a second frequency range, controllable bandpass filter circuity connected to the input mixer circuitry for bandpass filtering each frequency shifted input channel to remove unwanted noise from the MRI signal, output mixer circuity for frequency shifting the output of the controllable bandpass filter circuitry from the second frequency range to the first frequency range, summing circuitry for combining the outputs of the output mixer circuitry of each channel to produce the low noise output signal, mixer control circuitry for controlling the frequency shift of the input mixer circuitry and the output mixer circuitry, and filter control circuitry for controlling the bandwidth and phase shift characteristics of the controllable bandpass filter circuitry.

REFERENCES:
patent: 3674998 (1972-07-01), Benz
patent: 3824451 (1974-07-01), Freeman et al.
patent: 4689563 (1987-08-01), Bottomley et al.
patent: 4703273 (1987-10-01), Kolbe et al.

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