Siemens Healthcare Gmbh

Siemens Aktiengesellschaft

Shenzhen Tyki Lighting Technology Co., Ltd

Wen Ming Li

Jianmin Wang

Tong Tong

Jun You

Zeng He He

Shu Du

Jian Wang

Zhi Bin Li

Hong Cheng

Jian Li

Markus Vester

Juergen Nistler

Stephan Zink

Volker Matschl

Rainer Kurth

Zhi Guo Sun

Yu Liu

Ying Lun Wang

Hou Quan Lin

Jia Heng Tan

The disclosure relates to a hybrid orthogonal signal generator, a coil transmission front-end device, an RF coil system, and an MRI system. The hybrid orthogonal signal generator has an input end for receiving an RF signal, generates a hybrid orthogonal excitation signal on the basis of the RF signal, and provides the hybrid orthogonal excitation signal by means of an output end of the hybrid orthogonal signal generator, and comprises: a first conductor, arranged in a plane and being arc-shaped; and a second conductor having mutual inductance with the first conductor, the second conductor being connected between the input end and output end, wherein the first conductor and second conductor are parallel and arranged as mirror images of each other. The hybrid orthogonal signal generator has a compact size and is suitable for providing hybrid orthogonal excitation signals for an MRI system with a low field strength.

Compact hybrid orthogonal signal generator for MRI front-end

In a device and method for monitoring an RF transmission circuit of an MRI device: a first power measurement signal is acquired that indicates a voltage of a first RF signal provided by an RF power amplifier of the RF transmission circuit; two second power measurement signals are received that each indicate a voltage of one second RF signal, the two second RF signals being generated based on the first RF signal by a bridge of the circuit and transmitted via an RF transmit coil; an inverse matrix calculation is performed based on the two second power measurement signals to obtain a voltage calculation value; the voltage calculation value is compared with the first power measurement signal; an operational status of the RF transmission circuit is determined based on a difference between the voltage calculation value and a voltage value of the first power measurement signal.

High integrated and intelligent tx front-end used in MRI system

A telescoping magnetic resonance coil for a magnetic resonance imaging apparatus has a first coil half in a first coil housing, having a first coil support and a number of first coil units on the first coil support. The telescoping coil also has a second coil half in a second coil housing, having a second coil support and a number of second coil units on the second coil support. One end of the first coil housing is opposite to and slidable relative to one end of the second coil housing, and one end of the first coil support is opposite to and slidable relative to one end of the second coil support. The first coil units at the one end of the first coil support have connections to which sliding contacts of the second coil units at the one end of the second coil support are electrically connectable. The connections are slidable on the sliding contacts, and each of the sliding contacts is provided with a frequency compensation element that maintains a magnetic resonance frequency of the coil at a constant value.

Telescoping magnetic resonance coil for magnetic resonance imaging apparatus

A power supply apparatus for a magnetic resonance apparatus has a power supply terminal module with a power supply unit and a reference voltage pull-down unit, and a load terminal module with a voltage comparator connected to a load power-feed terminal, which compares a nominal voltage and an actual voltage of the load power-feed terminal. A counter begins counting when the actual voltage is lower than the nominal voltage, and keeps its count unchanged when the actual voltage is equal to the nominal voltage, and emits a signal corresponding to the count to a digital-to-analog converter, connected to a phase inverter, which converts the digital signal to a positive analog voltage. A phase inverter is connected to an output voltage reference terminal of the power supply unit, and inverts the phase of the analog voltage to produce a negative analog voltage that compensates voltage drop loss on a cable between the power supply and the load power-feed terminal.

Power supply apparatus and magnetic resonance imaging system

Coil system for a medical imaging system

LED deformable lamp

A tuning/detuning structure and a detuning method for an RF coil use an RF power source, a first impedance circuit, a first RF line, and a first port having a first guide leg end and a first input end, with the first guide leg end being connected to a first end ring capacitance of the RF coil. When the RF coil needs to be detuned, the first input end is connected to the first impedance circuit via the first RF line. When the RF coil needs to transmit an RF pulse signal, the first input end is connected to the RF power source via the first RF line. The need for a switch element is thereby reduced as is harm resulting from breakdown of such a switch element. An impedance circuit can be combined with a switch element to realize detuning jointly, and a good detuning effect can be achieved by a small number of switch elements.

Tuning/detuning circuit and detuning method for an RF coil

Radio-frequency (RF) coil apparatus for magnetic resonance imaging has a base and an RF coil, wherein the base has a sliding base guide structure and a guide cavity, the RF coil has a sliding coil structure fitting the sliding base guide structure, and an electric cable of the RF coil is accommodated in the guide cavity and can move in the guide cavity. One end of the electric cable is fixed to the RF coil by a first fixing bracket, and another end of the electric cable is fixed to the base by a second fixing bracket so that a predetermined length of the cable projects from the base.

Radio-frequency coil apparatus and base having a sliding and coil management system

An RF choke resonator assembly has a cylindrical magnetic field shielding case with openings at two ends thereof, a magnetic field shielding plate and a winding skeleton, and a capacitive plate inside the case. The magnetic field shielding plate closes the opening at one end of the case, and has a through-hole allowing a cable to pass there through. The cable is wound on the winding skeleton. The capacitive plate is disposed opposite the magnetic field shielding plate in the case, separated therefrom by the winding skeleton, and is electrically connected to the case in a closed manner. The capacitive plate has a through-hole allowing the cable to pass there through. The capacitive plate is remote from the other opening case end opposite the opening closed by the magnetic field shielding plate. An insulation space is formed at that other opening, having a length in the axial direction greater than or equal to one quarter of the length of the magnetic field shielding case in the axial direction.

Radio-frequency choke resonator assembly, coil cable and magnetic resonance imaging apparatus

Coil for a medical imaging system

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.

Decoupling inductor assembly, radio frequency receiving coil and magnetic resonance imaging apparatus

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.

Body coil and magnetic resonance imaging system

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.

Magnetic resonance imaging apparatus and local coil assembly and local coil thereof

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.

Local coil receiving channel selector for magnetic resonance imaging system

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&#xb0; between the antenna part and the tuning/detuning diode.

Growing community of inventors

Shenzhen, China

Wen Ming Li