Ultra wide band wireless radio transmission in MRI systems involving channel estimation
First Claim
1. A magnetic resonance system comprising:
- at least one radio frequency coil assembly disposed within an examination region, with each radio frequency coil assembly being located within the examination region;
at least one coil element which at least receives magnetic resonance signals from a subject in the examination region,an on-board analog to digital converter which digitizes the coil magnetic resonance signals,an on-board receiver which wirelessly receives a spread spectrum calibration signals from a wireless transceiver;
an on-board transmitter which wirelessly transmits the digitized magnetic resonance signals on the multiple channels transceiver on multiple channels at different frequencies in spread spectrum data signals to the wireless transceiver,an on-board channel estimator which estimates relative signal strength characteristics on the multiple channels of the spread spectrum based on the received calibration signal from the wireless transceiver andan on-board signal strength adjuster which adjusts strengths the data signals based on the signal characteristics of the calibration signal received by the on-board receiver.
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Accused Products
Abstract
At least one radio frequency coil (28, 30) is disposed within an examination region (14), the radio frequency coil (28, 30) wirelessly receives a spread spectrum calibration signal from and transmits multiple channels of data in spread spectrum data signals to an associated wireless transceiver (60, 64; 62, 66). A channel estimator (104, 106) estimates frequency dependent signal strength characteristics based on the calibration signal between the wireless transceiver (60, 64; 62, 66) and the associated coil (28, 30). A signal strength adjuster (108, 110) makes a frequency dependent adjustment to the data signals strengths such that the transmitted data signals are compensated based on the estimated signal characteristics from the received calibration signal to create frequency dependent compensated data signals.
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Citations
20 Claims
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1. A magnetic resonance system comprising:
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at least one radio frequency coil assembly disposed within an examination region, with each radio frequency coil assembly being located within the examination region; at least one coil element which at least receives magnetic resonance signals from a subject in the examination region, an on-board analog to digital converter which digitizes the coil magnetic resonance signals, an on-board receiver which wirelessly receives a spread spectrum calibration signals from a wireless transceiver; an on-board transmitter which wirelessly transmits the digitized magnetic resonance signals on the multiple channels transceiver on multiple channels at different frequencies in spread spectrum data signals to the wireless transceiver, an on-board channel estimator which estimates relative signal strength characteristics on the multiple channels of the spread spectrum based on the received calibration signal from the wireless transceiver and an on-board signal strength adjuster which adjusts strengths the data signals based on the signal characteristics of the calibration signal received by the on-board receiver. - View Dependent Claims (4, 5, 6, 7, 8)
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2. A magnetic resonance system comprising:
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at least one radio frequency coil disposed within an examination region to receive magnetic resonance data from the examination region, the radio frequency coil including; an on-board receiver which wirelessly receives calibration signals in a plurality of frequency bands of a spread spectrum from an associated wireless transceiver and an on-board transmitter which wirelessly transmits multiple channels of the magnetic resonance data in a plurality of frequency bands of the spread spectrum to the associated wireless transceiver; an on-board channel estimator programmed to; compare strengths of the calibration signals received in each of the plurality of frequencies bands of the spread spectrum with a predetermined signal strength; and based on the comparison, determine frequency bands of the spread spectrum with stronger and weaker signal reception, an on-board signal strength adjuster which makes a frequency band dependent adjustment to the magnetic resonance data signals strengths such that the magnetic resonance data signals transmitted by the transmitter in the plurality of frequency bands of the spread spectrum are compensated based on the frequency bands of the spread spectrum determined from the received calibration signal to have stronger and weaker signal reception. - View Dependent Claims (3, 9, 10)
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11. A magnetic resonance imaging method comprising:
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on-board an actual RF coil in an MRI examination region wirelessly receiving a spread spectrum calibration signal on a plurality of spread spectrum frequency bands at a radio frequency coil from an associated wireless transceiver; on-board the actual RF coil in an MRI examination region estimating spread spectrum frequency band dependent signal strength characteristics based on the spread spectrum calibration signal-transmitted from the associated wireless transceiver to the coil; on-board the actual RF coil in an MRI examination region based on the estimate, adjusting signal strengths data signals to be transmitted in the spread spectrum frequency bands which data signals carry magnetic resonance data acquired in an examination region and on-board the actual RF coil in an MRI examination region transmitting the signal strength adjusted data signals on the spread spectrum frequency bands to the associated wireless transceiver. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A magnetic resonance system comprising:
at least one MR coil disposed within an examination region, the coil including; an on-board receiver which wirelessly receives a spread spectrum calibration signal and an on-board transmitter which wirelessly transmits spread spectrum data signals including data packets to an associated wireless transceiver; at least one processor programmed to; estimate signal transmission characteristics based on the calibration signal transmitted between the wireless transceiver and the on-board receiver, and adjust a preamble of each transmitted data packet based on the estimated signal characteristics such that the size of the preambles is non-constant. - View Dependent Claims (20)
Specification