Abstract: A body coil for an MRI system has a conductor management and a tuning/detuning circuit. The tuning/detuning circuit is connected to the conductor management, and used to subject the conductor management to tuning/detuning control by a control signal. The tuning/detuning circuit has a control signal interface, a switch diode unit and an AC/DC conversion circuit. The control signal interface receives the control signal. There is at least one switch diode unit, respectively series-connected on at least one antenna rod and/or at least one end ring of the body coil conductor management. The AC/DC conversion circuit has a rectifying circuit, for converting the power of an input RF emission signal in the MRI system to a DC current, the DC current being used to provide a DC current for the switch diode unit to be turned on. The body coil reduces the cost of a DC power supply, and this reduces heat generated by the diodes.

Abstract: A synchronous reluctance motor rotor, including: a rotor core, wherein the rotor core includes a plurality of magnetic-flux barrier groups, and each magnetic-flux barrier group includes at least two magnetic-flux barriers provided at an interval in a radial direction of the rotor core; the rotor core further includes magnetic bridges, the magnetic bridges are disposed within the magnetic-flux barriers and connect inner surfaces of the magnetic-flux barriers with outer surfaces of the magnetic-flux barriers, and a distance between the magnetic bridges and an outer edge of the rotor core is no less than a predetermined distance.

Abstract: A local coil assembly for an MRI apparatus includes an RF channel setting unit, a basic coil having a first slot, and a first additional coil connected to the first slot. Each of the basic coil and the first additional coil includes one or more receiving channels. The RF channel setting unit is configured for setting a receiving channel of the basic coil and a receiving channel of the first additional coil. The basic coil is configured for receiving an RF signal according to a receiving channel set by the RF channel setting unit. The first additional coil is configured for receiving an RF signal according to a receiving channel set by the RF receiving channel setting unit. The present teachings are compatible with multiple coils, and support the combined use of multiple coils.

Abstract: A method for designing a hybrid surface optical system comprises establishing a first initial system; keeping the first initial system unchanged and calculating a plurality of first feature data points, and fitting the first feature data points to obtain a spherical surface; repeating such steps until all spherical surfaces are obtained; calculating a plurality of second feature data points, and fitting the plurality of second feature data points to obtain an aspheric surface; repeating such steps until all aspheric surfaces are obtained; calculating a plurality of third feature data points, and fitting the plurality of third feature data points to obtain a freeform surface; repeating such steps until all freeform surfaces are obtained.

Abstract: An off-axis hybrid surface three-mirror optical system comprises a primary mirror, a secondary mirror, a tertiary mirror, and an image sensor. A reflective surface of the primary mirror is a sixth-order polynomial freeform surface of xy. A reflective surface of the secondary mirror is a sixth-order polynomial aspheric surface of xy. A reflective surface of the a tertiary mirror is a spherical surface of xy.

Abstract: A decoupling device includes a first substrate, a first inductive coil printed on the first substrate, a second substrate, a second inductive coil printed on the second substrate, and a joining component. The joining component is for joining the first substrate to the second substrate. The first inductive coil and the second inductive coil have an area of overlap.

Abstract: A method for designing an off-axis aspheric optical system comprises establishing an initial system and selecting a plurality of feature rays Ri (i=1, 2 . . . K); solving a plurality of feature data points (P1, P2, . . . Pm) to obtain an initial off-axis aspheric surface Am by surface fitting the plurality of feature data points (P1, P2, . . . Pm), wherein m is less than K; introducing an intermediate point Gm to solve a (m+1)th feature data point Pm+1, and fitting a plurality of feature data points (P1, P2, . . . Pm, Pm+1) to obtain an off-axis aspheric surface Am+1; repeating such steps until a Kth feature data point PK is solved, and fitting a plurality of feature data points (P1, P2, . . . PK) to obtain an off-axis aspheric surface AK; and repeating above steps until all the aspheric surfaces of the off-axis aspheric optical system are obtained.

Abstract: An off-axis aspheric three-mirror optical system comprises a primary mirror, a secondary mirror, and a tertiary mirror. Relative to a first three-dimensional rectangular coordinates system in space, a second three-dimensional rectangular coordinates system is defined by a primary mirror location, a third three-dimensional rectangular coordinates system is defined by a secondary mirror location, and a fourth three-dimensional rectangular coordinates system is defined by a tertiary mirror location. The primary mirror in the second three-dimensional rectangular coordinates system, the secondary mirror in the third three-dimensional rectangular coordinates system, and the tertiary mirror in the fourth three-dimensional rectangular coordinates system are all sixth-order polynomial aspheric.

Abstract: A local coil for an MRI system includes a signal antenna to receive a magnetic resonance signal and a tuning/detuning circuit to subject the signal antenna part to switch control according to a control signal. The tuning/detuning circuit is connected to the signal antenna part. The tuning/detuning circuit includes a control signal interface, a resonant circuit and an AC/DC conversion circuit. The control signal interface receives the control signal. The resonant circuit includes a diode. The AC/DC conversion circuit converts an alternating current generated by an electromagnetic wave to a direct current. The AC/DC conversion circuit is connected in series with the diode. A small detuning control current may be used, and detuning control circuitry may be reduced.

Abstract: A local coil of an MRI system includes at least one cascade output slot, at least one cascade input slot, and at least one RF switch. The at least one RF switch includes a first input signal interface, a second input signal interface, and at least one output signal interface. The first input signal interface is connected to the at least one cascade input slot, the second input signal interface is connected to an RF signal interface of the local coil, and the output signal interface is connected to the at least one cascade output slot. The at least one RF switch is configured to output signals received by the first input signal interface and the second input signal interface from the output signal interface separately.

Abstract: A local coil and a magnetic resonance imaging system are provided. The local coil includes an antenna part, an adjustment part and a transmission part. The antenna part includes a first capacitor connected in series for adjusting a frequency of the antenna part. The adjustment part includes a tuning/detuning diode and is connected in parallel to the first capacitor, and the tuning/detuning diode is used for adjusting tuning and detuning of the antenna part. The transmission part includes a radio-frequency transmission line that connects the antenna part and the adjustment part, and the transmission part provides a phase difference of an odd multiple of 180° between the antenna part and the tuning/detuning diode.

Abstract: A shoulder coil for a magnetic resonance system includes a receiving part. The shoulder coil also includes a transmitting part used for coupling a radio-frequency magnetic field of a body coil of the magnetic resonance system.

Abstract: A magnetic resonance (MR) signal receiving apparatus has multiple local coils, capable of separately receiving MR signals generated by a body in an MR examination, each of the local coils having multiple antenna units and a time division multiplexing module. The time division multiplexing module enables MR signals received by the antenna units separately to be provided as an output by just one output line. The apparatus also has a reception coil channel selector having multiple input interfaces connected to the respective output lines of the multiple local coils, and a combiner in the reception coil channel selector that combines in time or power, all or a portion of the MR signals of the local coils, to form one or more MR composite signals.

Abstract: A magnetic resonance signal receiving apparatus has a local coil, and an RF receiver connected thereto the local coil via a plug. The local coil has multiple antenna units, each separately receiving magnetic resonance signals generated by a subject in a magnetic resonance examination. The local coil also has a respective bandpass filter for each antenna unit. The local coil also has a time division multiplexer having multiple input ports respectively connected to the bandpass filters. Bandpass-filtered magnetic resonance signals that have passed through the bandpass filters are thus emitted as an output by just one output line according to multiplexing timeslot. The RF receiver has one or more RF receiving channels for receiving and processing the magnetic resonance signal from the output line of the local coil. The RF receiver is disposed close to the plug.

Abstract: An adapter includes a control circuit, a control signal interface, a first input signal interface, a second input signal interface, and a first output signal interface. The control signal interface receives a tuning/detuning signal, and the control circuit switches, according to the tuning/detuning signal, the first input signal interface and the second input signal interface to be in conduction with the first output signal interface.

Abstract: A body coil for an MRI system has a conductor management and a tuning/detuning circuit. The tuning/detuning circuit is connected to the conductor management, and used to subject the conductor management to tuning/detuning control by a control signal. The tuning/detuning circuit has a control signal interface, a switch diode unit and an AC/DC conversion circuit. The control signal interface receives the control signal. There is at least one switch diode unit, respectively series-connected on at least one antenna rod and/or at least one end ring of the body coil conductor management. The AC/DC conversion circuit has a rectifying circuit, for converting the power of an input RF emission signal in the MRI system to a DC current, the DC current being used to provide a DC current for the switch diode unit to be turned on. The body coil reduces the cost of a DC power supply, and this reduces heat generated by the diodes.

Abstract: A decoupling inductor assembly, an RF receiving coil, and an MRI apparatus are provided. The decoupling inductor assembly includes a first inductor and a second inductor. The first inductor includes a first solenoid and a first port pair located at two ends of the first solenoid, and the second inductor includes a second solenoid and a second port pair located at two ends of the second solenoid. The first solenoid and the second solenoid are wound partially or completely overlapped. The first port pair includes at least one pair of first parallel connection interfaces, and the second port pair includes at least one pair of second parallel connection interfaces.

Abstract: A decoupling device includes a first substrate, a first inductive coil printed on the first substrate, a second substrate, a second inductive coil printed on the second substrate, and a joining component. The joining component is for joining the first substrate to the second substrate. The first inductive coil and the second inductive coil have an area of overlap.

Abstract: Presented in an embodiment is a local coil of an MRI system, including at least one cascade output slot, at least one cascade input slot, and at least one RF switch. The RF switch includes a first input signal interface, a second input signal interface, and at least one output signal interface, wherein the first input signal interface is connected to the cascade input slot, the second input signal interface is connected to a RF signal interface of the local coil, the output signal interface is connected to the cascade output slot. The RF switch is configured to output signals received by the first input signal interface and the second input signal interface from the output signal interface separately.

Abstract: A mode matrix processor of a magnetic resonance imaging system includes an input unit, an output unit, an operation unit, and a control unit, wherein the input unit is used for receiving a number of digital magnetic resonance signals; the operation unit is used for performing a linear combination operation on the plurality of digital magnetic resonance echo signals, to obtain at least one digital mode signal; the output unit is used for sending the at least one digital mode signal; and the control unit controls, according to the number of the digital magnetic resonance signals, the operation unit to perform the linear combination operation. The mode matrix processor of a magnetic resonance imaging system according to a specific embodiment of the present invention has desirable portability between different systems. The mode matrix processor of a magnetic resonance imaging system according to a specific embodiment of the present invention can improve the compatibility of coils between different systems.