4 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.

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 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.