Magnetic resonance imaging apparatus including elements for phase correction of wireless transmissions
First Claim
1. A magnetic resonance imaging apparatus comprising:
- a first clock generator which generates a first clock signal;
a pulse generator which generates an excitation pulse signal based on the first clock signal;
a transmission coil which wirelessly transmits an excitation pulse based on the excitation pulse signal;
a reception coil which receives the excitation pulse wirelessly transmitted from the transmission coil and a magnetic resonance echo emitted from a subject by a function of the excitation pulse to obtain a radio frequency signal;
a second clock generator which generates a second clock signal;
a digital converter which digitizes, synchronously with the second clock signal, the radio frequency signal or signal obtained by subjecting the radio frequency signal to predetermined processing, to obtain radio frequency data;
a pulse detector which detects excitation pulse data corresponding to the excitation pulse from the radio frequency data;
a phase detector which detects a phase of a pulse indicated by the excitation pulse data detected by the pulse detector; and
a corrector which calculates an amount of a phase shift which occurs in the magnetic resonance echo indicated by the radio frequency data during the digitization in the digital converter, based on the excitation pulse data and the phase detected by the phase detector and which corrects the radio frequency data so as to compensate for the amount of the phase shift.
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Accused Products
Abstract
In one embodiment, an MRI apparatus includes first and second clock generators, a pulse generator, transmission and reception coils, pulse and phase detectors, and a corrector. The pulse generator generates an excitation pulse signal based on a clock signal generated by the first clock generator. The reception coil outputs a radio frequency signals corresponding to an excitation pulse transmitted from the transmission coil or an MR echo. The converter digitizes, synchronously with a clock signal generated by the second clock generator, the radio frequency signal, to obtain radio frequency data. The pulse detector detects excitation pulse data corresponding to the excitation pulse from the radio frequency data. The phase detector detects a phase of a pulse indicated by the detected excitation pulse data. The corrector corrects the radio frequency data based on the detected phase, to compensate for a phase offset which occurs in the echo during the digitization.
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Citations
20 Claims
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1. A magnetic resonance imaging apparatus comprising:
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a first clock generator which generates a first clock signal; a pulse generator which generates an excitation pulse signal based on the first clock signal; a transmission coil which wirelessly transmits an excitation pulse based on the excitation pulse signal; a reception coil which receives the excitation pulse wirelessly transmitted from the transmission coil and a magnetic resonance echo emitted from a subject by a function of the excitation pulse to obtain a radio frequency signal; a second clock generator which generates a second clock signal; a digital converter which digitizes, synchronously with the second clock signal, the radio frequency signal or signal obtained by subjecting the radio frequency signal to predetermined processing, to obtain radio frequency data; a pulse detector which detects excitation pulse data corresponding to the excitation pulse from the radio frequency data; a phase detector which detects a phase of a pulse indicated by the excitation pulse data detected by the pulse detector; and a corrector which calculates an amount of a phase shift which occurs in the magnetic resonance echo indicated by the radio frequency data during the digitization in the digital converter, based on the excitation pulse data and the phase detected by the phase detector and which corrects the radio frequency data so as to compensate for the amount of the phase shift. - View Dependent Claims (2, 3, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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4. A magnetic resonance imaging apparatus comprising:
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a first clock generator which generates a first clock signal; a pulse generator which generates an excitation pulse signal based on the first clock signal; a transmission coil which wirelessly transmits an excitation pulse based on the excitation pulse signal; a reception coil which receives the excitation pulse wirelessly transmitted from the transmission coil and a magnetic resonance echo emitted from a subject by a function of the excitation pulse to obtain a radio frequency signal; a second clock generator which generates a second clock signal; a digital converter which digitizes, synchronously with the second clock signal, the radio frequency signal or signal obtained by subjecting the radio frequency signal to predetermined processing, to obtain radio frequency data; a pulse detector which detects excitation pulse data corresponding to the excitation pulse from the radio frequency data; a phase detector which detects a phase of a pulse indicated by the excitation pulse data detected by the pulse detector; an adjuster which adjusts a frequency of the second clock signal based on change with time of the phase detected by the phase detector; and a corrector which calculates an amount of a phase shift which occurs in the magnetic resonance echo indicated by the radio frequency data during the digitization in the digital converter, based on the excitation pulse data and the phase detected by the phase detector and which corrects the radio frequency data so as to compensate for the amount of the phase shift.
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5. A magnetic resonance imaging apparatus comprising:
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a first clock generator which generates a first clock signal; a pulse generator which generates an excitation pulse signal based on the first clock signal; a transmission coil which wirelessly transmits an excitation pulse based on the excitation pulse signal; an antenna which outputs a radio frequency signal corresponding to the excitation pulse wirelessly transmitted from the transmission coil; a reception coil which outputs a radio frequency signal corresponding to magnetic resonance echo emitted from a subject by a function of the excitation pulse; a second clock generator which generates a second clock signal; a digital converter which digitizes, synchronously with the second clock signal, the radio frequency signals output from the antenna and the reception coil or signals obtained by subjecting the radio frequency signals to predetermined processing, to obtain radio frequency data; a pulse detector which detects excitation pulse data corresponding to the excitation pulse from the radio frequency data; a phase detector which detects a phase of a pulse indicated by the excitation pulse data detected by the pulse detector; and a corrector which calculates an amount of a phase shift which occurs in the magnetic resonance echo indicated by the radio frequency data during the digitization in the digital converter, based on the excitation pulse data and the phase detected by the phase detector and which corrects the radio frequency data so as to compensate for the amount of the phase shift. - View Dependent Claims (6, 7)
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8. A magnetic resonance imaging apparatus comprising:
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a first clock generator which generates a first clock signal; a pulse generator which generates an excitation pulse signal based on the first clock signal; a transmission coil which wirelessly transmits an excitation pulse based on the excitation pulse signal; an antenna which outputs a radio frequency signal corresponding to the excitation pulse wirelessly transmitted from the transmission coil; a reception coil which outputs a radio frequency signal corresponding to magnetic resonance echo emitted from a subject by a function of the excitation pulse; a second clock generator which generates a second clock signal; a digital converter which digitizes, synchronously with the second clock signal, the radio frequency signals output from the antenna and the reception coil or signals obtained by subjecting the radio frequency signals to predetermined processing, to obtain radio frequency data; a pulse detector which detects excitation pulse data corresponding to the excitation pulse from the radio frequency data; a phase detector which detects a phase of a pulse indicated by the excitation pulse data detected by the pulse detector; an adjuster which adjusts a frequency of the second clock signal based on change with time of the phase detected by the phase detector; and a corrector which calculates an amount of a phase shift which occurs in the magnetic resonance echo indicated by the radio frequency data during the digitization in the digital converter, based on the excitation pulse data and the phase detected by the phase detector and which corrects the radio frequency data so as to compensate for the amount of the phase shift.
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Specification