According to some aspects, a portable magnetic resonance imaging system is provided, comprising a Bo magnet configured to produce a Bo magnetic field for an imaging region of the magnetic resonance imaging system, a noise reduction system configured to detect and suppress at least some electromagnetic noise in an operating environment of the portable magnetic resonance imaging system, and electromagnetic shielding provided to attenuate at least some of the electromagnetic noise in the operating environment of the portable magnetic resonance imaging system, the electromagnetic shielding arranged to shield a fraction of the imaging region of the portable magnetic resonance imaging system. According to some aspects, the electromagnetic shield comprises at least one electromagnetic shield structure adjustably coupled to the housing to provide electromagnetic shielding for the imaging region in an amount that can be varied. According to some aspects, substantially no shielding of the imaging region is provided.

A system is described for emitting a radiofrequency field for a magnetic resonance imaging device, including a volumetric antenna that emits a radiofrequency field, a device for homogenizing the radiofrequency field arranged between said volume antenna and a part of the body to be imaged. The device may include a first continuous metal track with an overall length of approximately 0.5 to approximately 1.5 times said wavelength of the radio frequency field. The first metallic track may occupy a surface with a largest dimension ranging between approximately 5% and approximately 15% of said wavelength of the radio frequency field. The first metal track is arranged in a pattern including a plane of symmetry that is normal to the electrical component of the radio frequency field, so as to give the device an electric dipole property including a natural frequency strictly greater than the frequency of the radio frequency field.

A system is described for emitting a radiofrequency field for a magnetic resonance imaging device, including a volumetric antenna that emits a radiofrequency field, a device for homogenizing the radiofrequency field arranged between said volume antenna and a part of the body to be imaged. The device may include a first continuous metal track with an overall length of approximately 0.5 to approximately 1.5 times said wavelength of the radio frequency field. The first metallic track may occupy a surface with a largest dimension ranging between approximately 5% and approximately 15% of said wavelength of the radio frequency field. The first metal track is arranged in a pattern including a plane of symmetry that is normal to the electrical component of the radio frequency field, so as to give the device an electric dipole property including a natural frequency strictly greater than the frequency of the radio frequency field.

A MRI device including a main field unit for establishing a main magnetic field (MF) in an imaging region, a gradient coil assembly for generating a gradient field in the imaging region, a RF arrangement for sending excitation signals to and receiving MR signals from the imaging region, a field camera for determining MF information in the imaging region, the field camera comprising multiple MF sensors arranged at measurement positions enclosing the imaging region, and a controller. The controller is configured to receive sensor data for each measurement positions, from the sensor data, calculate the MF information for the imaging region, and implement a calibration and/or correction measure depending on the MF information. The field camera may be a vector-field camera acquiring vector-valued sensor data describing the MF at each measurement positions three-dimensionally. The controller may determine the MF information to three dimensionally describe the MF in the imaging region.

In a method for reducing and/or correcting deviations from a target gradient of a magnetic field gradient created by an MR system input data is provided for a trained function trained by a machine-learning algorithm, wherein the input data comprises information about the target gradient of the MR system. The trained function further creates output data with the aid of the input data. The deviations from the target gradient of the magnetic field gradient created by the MR system are reduced and/or corrected with the aid of the output data created.

In a method for reducing and/or correcting deviations from a target gradient of a magnetic field gradient created by an MR system input data is provided for a trained function trained by a machine-learning algorithm, wherein the input data comprises information about the target gradient of the MR system. The trained function further creates output data with the aid of the input data. The deviations from the target gradient of the magnetic field gradient created by the MR system are reduced and/or corrected with the aid of the output data created.

A method of operating a magnetic resonance imaging (MRI) apparatus includes exciting a body coil of the MRI apparatus to emit a radio-frequency signal, determining a center frequency of a resonance curve of the body coil, and calculating a magnet target frequency based on the determined center frequency. A magnet is ramped to the magnet target frequency.

Methods and apparatus for determining at least one metabolic state of a subject using a nuclear magnetic resonance (NMR) monitoring device. The NMR monitoring device comprises at least one magnet configured to generate a primary magnetic field, a transceiver coil arranged within the primary magnetic field, wherein the transceiver coil is configured to apply a time series of radiofrequency (RF) pulses to a portion of a subject located within the primary magnetic field and detect an NMR signal generated in response to application of the time series of RF pulses, and an NMR spectrometer communicatively coupled to the transceiver coil. The NMR spectrometer is configured to process the detected NMR signal to determine at least one metabolic state of the subject.

A MRI device including a main field unit for establishing a main magnetic field (MF) in an imaging region, a gradient coil assembly for generating a gradient field in the imaging region, a RF arrangement for sending excitation signals to and receiving MR signals from the imaging region, a field camera for determining MF information in the imaging region, the field camera comprising multiple MF sensors arranged at measurement positions enclosing the imaging region, and a controller. The controller is configured to receive sensor data for each measurement positions, from the sensor data, calculate the MF information for the imaging region, and implement a calibration and/or correction measure depending on the MF information. The field camera may be a vector-field camera acquiring vector-valued sensor data describing the MF at each measurement positions three-dimensionally. The controller may determine the MF information to three dimensionally describe the MF in the imaging region.

An arrangement that enables performing of both magnetic particle imaging and magnetic resonance imaging and a device including the arrangement are provided. The arrangement that enables performance of both magnetic particle imaging and magnetic resonance imaging includes: at least one primary magnetic element pair configured to generate a selection magnetic field (SMF1/SMF2) for magnetic particle imaging, at least one secondary magnetic element pair configured to generate a driving magnetic field, and at least one tertiary magnetic element pair configured to generate a focus magnetic field (FMF).