Magnetic resonance imaging receive chain with dynamic gain and wireless receiver coil
First Claim
1. A magnetic resonance imaging system including:
- a magnetic resonance scanner for exciting and spatially encoding a magnetic resonance signal;
an antenna for communicating a reference radio frequency signal by airwave transmission;
a radio frequency coil and coupled radio frequency receiver for receiving radio frequency signals including the excited and spatially encoded magnetic resonance signal and the reference radio frequency signal; and
a correcting means for correcting the spatially encoded magnetic resonance signal in accordance with the received reference radio frequency signal.
1 Assignment
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Accused Products
Abstract
Methods and apparatuses are disclosed for dynamic adjustment of the receiver gain during magnetic resonance imaging (MRI) scan. To account for distortions introduced by the receiver that may be different at various receiver gains, a reference radio frequency (rf) signal is applied to the receive chain by an additional antenna. In some disclosed embodiments the reference signal is adjusted such that its frequency lies at the border of the frequency band detected by the MR scan. Comparing the a priori known amplitude and phase of the reference signal with the amplitude and phase of the received reference signal allows determination of the distortions introduced at the respective receiver gain which are subsequently corrected. In some disclosed embodiments, the reference signal is used to synchronize the modulation and demodulation units of a wireless transceiver system.
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Citations
20 Claims
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1. A magnetic resonance imaging system including:
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a magnetic resonance scanner for exciting and spatially encoding a magnetic resonance signal; an antenna for communicating a reference radio frequency signal by airwave transmission; a radio frequency coil and coupled radio frequency receiver for receiving radio frequency signals including the excited and spatially encoded magnetic resonance signal and the reference radio frequency signal; and a correcting means for correcting the spatially encoded magnetic resonance signal in accordance with the received reference radio frequency signal. - View Dependent Claims (2)
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3. A magnetic resonance imaging system including:
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a magnetic resonance scanner for exciting and spatially encoding a magnetic resonance signal; a reference radio frequency signal generating means for generating a reference radio frequency signal; a receiving means for receiving radio frequency signals including the excited and spatially encoded magnetic resonance signal and the reference radio frequency signal; a signal processing means for performing signal processing on the received radio frequency signals, the signal processing means including; a signal conditioning means for conditioning the received radio frequency signals to produce conditioned radio frequency signals, a digitizing means for a convening the conditioned radio frequency signals into digitized radio frequency signals, and a reconstruction means for reconstructing at least a magnetic resonance signal component of the digitized radio frequency signals into a reconstructed image; and a correcting means for correcting the spatially encoded magnetic resonance signal in accordance with the received reference radio frequency signal, the correcting means includes; a reference signal recovery means for recovering a reference radio frequency signal component of the digitized radio frequency signals, and a control means for controlling the signal processing means based on comparison of the reference radio frequency signal component of the digitized radio frequency signals and the reference radio frequency signal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A magnetic resonance imaging method including:
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exciting and spatially encoding a magnetic resonance signal; generating a reference radio frequency signal; receiving radio frequency signals including the excited and spatially encoded magnetic resonance signal and the reference radio frequency signal; and correcting the magnetic resonance signal in accordance with the received reference radio frequency signal. - View Dependent Claims (15, 16, 17, 18)
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19. A magnetic resonance imaging method comprising:
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exciting and spatially encoding a magnetic resonance signal; generating a reference radio frequency signal; concurrently receiving radio frequency signals including the excited and spatially encoded magnetic resonance signal and the reference radio frequency signal; processing together the received radio frequency signals including both the received excited and spatially encoded magnetic resonance signal and the concurrently received reference radio frequency signal; and correcting the processing of the received excited and spatially encoded magnetic resonance signal based on comparison of the concurrently received and processed reference radio frequency signal with the generated reference radio frequency signal. - View Dependent Claims (20)
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Specification