Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1989-08-11
1992-12-08
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324307, 36441313, G01R 3320
Patent
active
051701235
ABSTRACT:
A magnetic resonance imaging apparatus includes one or more digital transmitters (B), one or more digital receivers (C), and digital data processing circuitry (D) which are all clocked and controlled by a single clock (F). Each digital transmitter includes a numerically controlled modulated oscillator (20) which processes digital phase and frequency signals to produce an output which addresses a wave-form map stored in a PROM (22). Each wave-form output of the PROM is multiplied (24) by a digital amplitude profile signal to generate a phase, frequency, and amplitude modulated digital RF signals. A clock gate (30) controls clocking of the digital modulation to create RF pulses. A digital-to-analog converter (28) converts the digital information to an analog RF pulse which is applied to a subject in an image region. The receivers each include an analog-to-digital converter (60) which digitizes the magnetic resonance signal emanating from the subject in the image region with four fold oversampling. A pair of FIR filters (62a, 62b) multiply the digital resonance signal by digital sine and cosine filter coefficients to create in-phase and out-of-phase digital magnetic resonance signal components. After additional digital filtering (64a, 64b), the digital in-phase and quadrature components are Fourier transformed (70) and accumulated in an image memory (72) to form an image representation.
REFERENCES:
patent: 4694254 (1987-09-01), Vatis et al.
patent: 4740744 (1988-04-01), Lubarsky et al.
patent: 4777438 (1988-10-01), Holland
patent: 4879514 (1989-11-01), Mehlkopf et al.
patent: 4992736 (1991-02-01), Stortmont et al.
patent: 5004983 (1991-04-01), Proska et al.
PTS 160 System Section, Programmed Test Sources, Inc. Littleton, Mass. pp. cover-28 (1980).
"A Fully Digital Spectrometer for Low Field MR Imaging Systems"; SMRA Book of Abstracts, R. Proska, vol. 1, Aug. 20, 1988.
William E. Sabin, et al., "Digital Signal Processing", 1987, pp. 247-291, Single-Sideband Systems and Circuits.
"Data Sheet DRFS-2250, DRFS-3250 Number Controlled Modulated Oscillator", Advertising Brochure of Digital RF.
"IMS A100 IMS A100M Cascadable Signal Processor", Advertising Brochure of INMOS, Feb. 1989.
"Advanced Information Cascadable-Adaptive Finite-Impulse-Response (CAFIR) Digital-Filter Chip", Advertising Brochure of Motorola Semiconductor Technical Data, 1988, pp. 1-9.
"Advance Information 56-Bit General Purpose Digital Signal Processor", Advertising Brochure of Motorola Semiconductor Technical Data, 1988, pp. 1-8.
"Digital Signal Processing Software Package", Advertising Brochure of Burr-Brown Corporation, 1987, pp. 1-4.
"Filter Design and Analysis Systems", Advertising Brochure of Momentum Data Systems Inc.
Blakeley Douglas M.
Denison Kenneth S.
Flugan David C.
Holland G. Neil
Stauber John R.
Arana Louis
Picker International Inc.
LandOfFree
Magnetic resonance imager with digital transmitter/receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic resonance imager with digital transmitter/receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic resonance imager with digital transmitter/receiver will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-962895