Abstract: A nuclear magnetic resonance (NMR) apparatus includes a pair of permanent magnets spaced apart from each other and defining a sample space, the permanent magnets providing a magnetic field in the sample space, an array of magnetic field sensors arranged relative to the sample space to provide, during operation, information about a homogeneity of the magnetic field, an array of magnetic coils arranged relative to the sample space so that each magnetic coil, during operation, generates a magnetic field that changes the magnetic field in the sample space, and an electronic controller programmed to receive information about the magnetic field from the array of magnetic field sensors and to variably energize the magnetic coils in the array of magnetic coils so that the magnetic fields generated by the array of magnetic coils reduces inhomogeneities of the magnetic field.

Abstract: An apparatus includes a housing, an ultrasound transducer in the housing and positioned to direct ultrasound signals to a volume of a subject and detect reflected ultrasound signals from the volume of the subject, a magnet arranged in the housing and positioned such that a magnetic field of the magnet penetrates the volume of the subject, a radiofrequency (RF) system to perturb a nuclear spin polarization of nuclei in the volume of the subject and detect radio waves emitted from the volume, and an electronic controller programmed to compile an image of at least a first region of the subject based on the detected ultrasound signals and compile a magnetic resonance image of at least a second region of the subject based on the detected radio waves.

Abstract: A nuclear magnetic resonance (NMR) apparatus includes a pair of permanent magnets spaced apart from each other and defining a sample space, the permanent magnets providing a magnetic field in the sample space, an array of magnetic field sensors arranged relative to the sample space to provide, during operation, information about a homogeneity of the magnetic field, an array of magnetic coils arranged relative to the sample space so that each magnetic coil, during operation, generates a magnetic field that changes the magnetic field in the sample space, and an electronic controller programmed to receive information about the magnetic field from the array of magnetic field sensors and to variably energize the magnetic coils in the array of magnetic coils so that the magnetic fields generated by the array of magnetic coils reduces inhomogeneities of the magnetic field.