12 results about "Resonance measurement" patented technology

The invention relates to a method for correcting the influence of interfering effects on a gradient system of a magnetic resonance device during a magnetic resonance measurement, having the following steps: emitting a gradient pulse by means of an amplifier of the gradient system; detecting a gradient profile; detecting an output signal of the amplifier for the gradient pulse; determining a gradient system transfer function; and determining an output signal of the amplifier, which provides the desired gradient profile at the output signal. The invention also relates to a correction device, which is designed to adjust an input signal of the amplifier in accordance with the determined output signal of the amplifier and the detected output signal of the amplifier. Furthermore, the invention relates to a magnetic resonance device and a magnetic resonance system having the correction device, as well as a computer program product having a computer program and a computer-readable medium for carrying out the method according to the invention.

In a general embodiment, a magnetic resonance system performs magnetic resonance measurements. In some examples, the magnetic resonance system includes a data processing unit and a superheterodyne spectrometer system. The data processing unit generates digital intermediate frequency (IF) signal information based on the pulse profile. The digital IF signal information is configured to suppress image sidebands in the magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

A method according to the invention for acquiring T2*-weighted measurement data of a test object using a magnetic resonance system comprises the steps: - irradiating a first RF excitation pulse to excite spins in a first layer in the test object, - switching gradients to generate at least one gradient echo signal, - after an echo time following the irradiation of the first RF excitation pulse, acquiring a first gradient echo signal from the first layer, - after the irradiation of the first RF excitation pulse and before the elapsed echo time following the first RF excitation pulse, irradiating at least one further RF excitation pulse to excite spins in a further layer,wherein, before the application of a further RF excitation pulse and after each RF excitation pulse preceding the further RF excitation pulse, a pre-rephasing gradient of a moment corresponding to the further RF excitation pulse following the pre-rephasing gradient is switched, - recording generated further gradient echo signals from further layers. By switching the pre-rephasing gradients according to the invention, gradient echo signals of the spins of different layers excited by the first RF excitation pulse and the at least one further RF excitation pulse can be separated. Thus, the echo time TE, which elapses until a first gradient echo signal is measured after the first RF excitation pulse, can be used to generate and measure further gradient echo signals in further layers after the first gradient echo signal, which increases the readout efficiency.

The present invention discloses a method for optimizing the sampling trajectory of a molecular exchange magnetic resonance (MEL) measurement. The method includes the steps of: (1) determining the number and corresponding range of physiological / physical parameters of a molecular exchange system and generating a simulated physiological / physical parameter dataset; (2) determining a molecular exchange magnetic resonance measurement method and setting the acquisition parameters; (3) constructing an end-to-end integrated network model including a sampling trajectory optimization network, a noise signal generation network, and a parameter estimation network; and (4) training the network using the simulated physiological / physical parameters as input, and obtaining the optimized sampling trajectory and the corresponding parameter estimation network once the network has converged and training is complete. The present invention further discloses a molecular exchange magnetic resonance measurement method and apparatus. The method for optimizing the sampling trajectory of a molecular exchange magnetic resonance measurement provided by the present invention improves the efficiency and accuracy of physiological / physical parameter estimation and can be applied to various molecular exchange magnetic resonance measurement methods.

The invention relates to a method for monitoring a magnetic resonance measurement, a magnetic resonance device, and a computer program. During the magnetic resonance measurement, monitoring values ​​are acquired. These monitoring values ​​are quantized to generate monitoring memory values. The monitoring memory values ​​are stored as a prefix-free code in a memory unit. The magnetic resonance measurement is then monitored for compliance with a monitoring limit value based on these stored monitoring values.

A local coil including an antenna, base element, holding element, first and second guide mechanisms, and safety mechanism. The antenna receives high-frequency signals in a frequency range and power range of a magnetic resonance measurement and is mechanically connected to the holding element. The base element holds the holding element together with the antenna in a position for use on a diagnostically relevant body region of a patient. The first guide mechanism is mechanically connected to the base element and the holding element and positions the holding element variably relative to the base element. The second guide mechanism is mechanically connected to the holding element and the antenna and positions the antenna variably relative to the holding element. The safety mechanism prevents a collision between the antenna and the patient during a transfer of the holding element from an open position into a closed position using the first guide mechanism.

The invention relates to a method for providing an image of a diagnostically relevant region of a jaw region of a patient by means of a magnetic resonance device, the method having the following steps: detecting (S1) information about the jaw region of the patient, the information comprising at least one indication of the position and / or extent of a diagnostically relevant region of the jaw region; adapting (S5) parameters of a magnetic resonance measurement in accordance with the detected information about the jaw region of the patient; performing (S7) a magnetic resonance measurement with the adapted parameters and detecting image data of the jaw region of the patient; reconstructing (S8) an image of the diagnostically relevant region of the jaw region from the detected image data; and providing (S9) the image of the diagnostically relevant region of the jaw region of the patient. The invention also relates to a magnetic resonance device comprising a computing unit (28), the computing unit being configured to coordinate and perform the above-mentioned method by means of the magnetic resonance device.

In a general aspect, a magnetic resonance system performs a magnetic resonance measurement. In some examples, a magnetic resonance system includes data processing apparatus and a superheterodyne spectrometer system. The data processing apparatus generates digital intermediate frequency (IF) signal information based on a pulse profile. The digital IF signal information is configured to suppress an image sideband in a magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

The application relates to the technical field of magnetic resonance imaging, and provides an ASL perfusion imaging method, device and system based on multi-parameter magnetic resonance measurement, which comprises the following steps: determining a first parameter based on first magnetic resonance measurement data; determining a second parameter based on second magnetic resonance measurement data; determining a third parameter based on third magnetic resonance measurement data; determining a labeling delay time of ASL perfusion imaging based on the first parameter, the second parameter and the third parameter; and performing ASL perfusion imaging based on the labeling delay time. The first parameter comprises blood vessel path length information, the second parameter comprises blood flow velocity information, and the third parameter comprises blood longitudinal relaxation time. The application does not need to prolong the examination time, can match more suitable labeling delay time for different subjects, and improves the accuracy of the examination result.

The invention provides a high-frequency high-dynamic wireless resonance measurement and decoupling system, and relates to the technical field of high-frequency measurement. A resonance type sensor is connected with a high-frequency signal processing circuit through a wireless communication module; the high-frequency signal processing circuit is connected with the upper computer control module; the resonance type sensor is used for sensing environmental parameters and responding to an external excitation signal in the form of resonance characteristic change of the resonance type sensor; the wireless communication module consists of a transmitting antenna and a receiving antenna and is used for receiving a wireless response signal from the resonance type sensor; the high-frequency signal processing circuit is connected with a receiving antenna of the wireless communication module and is used for generating a high-frequency excitation signal, radiating the high-frequency excitation signal to the resonance type sensor through a transmitting antenna of the wireless communication module and receiving and processing a wireless response signal returned by the resonance type sensor at the same time; extracting an S11 parameter representing the resonance characteristic of the resonance type sensor; the upper computer control module is used for parameter setting, real-time data processing, multi-parameter decoupling analysis and data storage.

Method for monitoring the absorption of transmission power emitted into a patient by a transmitter unit of a magnetic resonance device, wherein the method comprises - Providing absorption data that describe a patient-nonspecific, location-dependent absorption sensitivity of the transmitted power, - Positioning the patient in an irradiation area of ​​the magnetic resonance device, in which the transmission power is to be irradiated into the patient, - Capturing the patient's anatomy within the radiation field, - Mapping the absorption data to the patient's anatomy, - Performing a magnetic resonance measurement of the patient, whereby the transmitted power absorbed by the patient is monitored during the magnetic resonance measurement based on the associated absorption data, - Recording position data, where the position data describe a position of the patient in the radiation area relative to the transmitting unit of the magnetic resonance device during the performance of the magnetic resonance measurement, wherein the transmitting unit is part of a local coil, whereby in the event of excessive patient movement and / or coil displacement the magnetic resonance measurement is aborted.

A method for ascertaining at least one monitoring parameter for monitoring cardiac stimulation during a magnetic resonance measurement of a patient, a magnetic resonance apparatus, and a computer program product are provided. According to the method, the patient is positioned in the magnetic resonance apparatus. The cardiac position of the patient relative to the magnetic resonance apparatus is ascertained. The at least one monitoring parameter is ascertained based on a monitoring model as a function of the cardiac position of the patient.