A method is provided for calibration of a magnetic resonance device with a transmitting device for generating an excitation field. In a first acquisition phase, a first transmitting coil element is detuned, at least one second transmitting coil element is tuned, and an MR data set is acquired using the transmitting device. In a second acquisition phase, the first transmitting coil element, the at least one second transmitting coil element are tuned, and at least one further MR data set is acquired using the transmitting device. By an arithmetic unit, a calibration factor is determined based on the MR data set and the at least one further MR data set for calculating a total voltage value at a feeding point of the first transmitting coil element from voltage values, which may be measured at a measuring point of an electrical supply line of the first transmitting coil element.

A relative substance composition (RSC) of a portion of a body of a patient in a field of view for a medical image to be taken from the patient in a medical imaging scan is estimated. An input interface receives a piece of patient information data (PPID) and receives a piece of field-of-view information data (PFID). A computing device is configured to implement a trained machine learning algorithm (MLA). The trained MLA is configured and trained to receive the PPID and the PFID received by the input interface as an input and to generate as an output an output signal indicating an RSC of a portion of the body of the patient for the medical image based on the PPID and the PFID. An output interface outputs at least the output signal.

A method may include obtaining image data of a subject acquired by an imaging device. The method may also include determining one or more characteristics associated with a body part of the subject from the image data. The one or more characteristics of the body part of the subject may include at least one of position information of the body part in the subject, geometric morphology information of the body part, water content information, or fat content information. The method may also include determining, based on one or more characteristics associated with the body part, values of one or more individualized parameters corresponding to the subject. The method may further include causing the imaging device to perform an imaging scan on the subject according to the values of the one or more individualized parameters.

Provided in embodiments of the present invention are a magnetic resonance imaging system and a main magnetic field correction method therefor, and a storage medium. Specifically, provided are a magnetic resonance imaging system, a main magnetic field correction method for the magnetic resonance imaging system, and a computer-readable storage medium. The method includes: obtaining an estimated image of a phantom based on a first imaging sequence, the first imaging sequence having a variable resonant frequency; pre-correcting a main magnetic field based on the estimated image; obtaining a scanned image of the phantom based on the pre-corrected main magnetic field; and determining whether the quality of the scanned image is within an acceptable range, and if not, returning to the step of obtaining the estimated image.

A magnetic resonance tomography (MRT) unit includes a field magnet, a transmitter, and a transmitting antenna. The MRT unit also has a transmission interference suppression facility with a transmission interference suppression controller, a plurality of sensors, and a transmission interference suppression antenna. The transmission interference suppression facility is configured to pick up, with the sensors, an excitation signal of the transmitter, determine, with the transmission interference suppression controller, a transmission interference suppression signal as a function of the excitation signal of the transmitter, and emit the signal via the transmission interference suppression antenna, so that at a predetermined location outside of the MRT unit, an electromagnetic alternating field of an excitation signal emitted by the transmitter via the transmitting antenna is attenuated. The sensors are arranged in a near field of the transmitting antenna, and the predetermined location of the attenuation is in a far field of the transmitting antenna.

A method of operating a multi-coil magnetic resonance imaging system, is disclosed which includes establishing initial circuit values of a drive circuit, loading a tissue model associated with a tissue to be imaged, loading target values for a variable of interest (VOI) associated with operation of two or more coils of a magnetic resonance imaging system, performing a simulation based on the established circuit values and the loaded tissue model, determining output values of the VOI based on the simulation, comparing the simulated output values of the VOI to the loaded target values of the VOI, if the simulated output values are outside of a predetermined envelope about the loaded target values of the VOI, then performing a first optimization until the simulated output values are within the predetermined envelope.

A method and system for transmitting an electromagnetic (EM) signal in a wellbore to improve an open loop system. The method comprises measuring a parameter indicative of a property of a transmitter using a sensor in the wellbore and generating an input signal for the transmitter based at least in part on the measured parameter to correct distortions exhibited by the output signal of the transmitter. The method comprises also comprises applying the input signal to the transmitter to transmit the EM signal corrected for distortions. The system comprises an antenna, a transmitter, a sensor, and a controller. The controller is configured and operable to generate an input signal for the transmitter based at least in part on the measured parameter to correct distortions exhibited by an output signal of the transmitter; and apply the input signal to the transmitter to transmit the EM signal corrected for the distortions.

Systems and methods for determining proton spectral characteristics associated with a pair of targets from an MRI data volume are provided. The methods can include identifying spectral widths and peak-to-peak distance associated with the targets from the MRI data volume. The targets could include water and fat. The identified proton spectral characteristics can be useful for accurate spectral fat saturation, improving dynamic shim routines, and optimizing bandwidth of radiofrequency pulses used in multi-slice or multi-band excitation.

A system and method are provided for producing at least one of an image or a map of a subject. The method includes controlling a magnetic resonance imaging system to perform a pulse sequence that includes at least one phase increment of an RF pulse of a gradient echo pulse sequence configured to encode longitudinal relaxation (T1) information in an imaginary component of a magnetic resonance (MR) data received from the subject and encode at least transverse relaxation (T2) information in a real component of the MR data received from the subject. The method also includes generating a T1 image or map of the subject or a T2 image or map of the subject from the MR data and displaying the T1 image or map or the T2 image or map of the subject.

A method for determining an item of evaluation information from a reception signal received by a magnetic resonance apparatus, a computer program product for carrying out such a method, and a magnetic resonance apparatus generate a useful signal having a first frequency band. The magnetic resonance apparatus is configured to generate a magnetic resonance signal in a second frequency band. The first frequency band lies at least partially, (e.g., completely), within the second frequency band. A reception signal is received by a receiving unit of the magnetic resonance apparatus. From the reception signal, an item of evaluation information is determined which characterizes the useful signal.