Abstract:
A method includes applying a plurality of currents to a plurality of electrodes disposed on a surface surrounding an anatomical region in a subject. Further, the method includes measuring a plurality of voltages generated in response to the plurality of currents. The method also includes selecting a coarse-scale basis corresponding to a response function associated with the plurality of electrodes. Moreover, the method includes determining simultaneously an internal admittivity corresponding to the anatomical region and a contact impedance corresponding to the plurality of electrodes based on the plurality of voltages and the coarse-scale basis. The method also includes reconstructing the diagnostic image based on the internal admittivity.
Abstract:
The embodiments disclosed herein relate generally to magnetic resonance imaging systems and, more specifically, to the manufacturing of a gradient coil assembly for magnetic resonance imaging (MRI) systems. For example, in one embodiment, a method includes ultrasonically consolidating a plurality of sheets of a conductive material to form a consolidated structure and machining one or more conductive channels into the consolidated structure to form an inductor.
Abstract:
A method and system for performing electrical impedance imaging of a subject of interest using a plurality of electrodes is provided. The method includes applying one or more determined current patterns to one or more electrodes of the plurality of electrodes. Further, the method includes determining a resultant voltage at at least one electrode of the one or more electrodes in response to the one or more determined current patterns. Moreover, the method includes estimating a change in a contact impedance for the at least one electrode of the one or more electrodes. Additionally, the method includes calculating a compensated voltage for the at least one electrode based on an estimated change in a corresponding contact impedance of the at least one electrode.
Abstract:
A method and system for performing electrical impedance imaging of a subject of interest using a plurality of electrodes is provided. The method includes applying one or more determined current patterns to one or more electrodes of the plurality of electrodes. Further, the method includes determining a resultant voltage at at least one electrode of the one or more electrodes in response to the one or more determined current patterns. Moreover, the method includes estimating a change in a contact impedance for the at least one electrode of the one or more electrodes. Additionally, the method includes calculating a compensated voltage for the at least one electrode based on an estimated change in a corresponding contact impedance of the at least one electrode.
Abstract:
A method includes applying a plurality of currents to a plurality of electrodes disposed on a surface surrounding an anatomical region in a subject. Further, the method includes measuring a plurality of voltages generated in response to the plurality of currents. The method also includes selecting a coarse-scale basis corresponding to a response function associated with the plurality of electrodes. Moreover, the method includes determining simultaneously an internal admittivity corresponding to the anatomical region and a contact impedance corresponding to the plurality of electrodes based on the plurality of voltages and the coarse-scale basis. The method also includes reconstructing the diagnostic image based on the internal admittivity.
Abstract:
Implementations are disclosed for monitoring a state or change in state of a physiological parameter based on measured impedance data. In certain implementations, no images are reconstructed from the impedance data. In certain implementations, a metric (e.g., distinguishability, likelihood ratios, and so forth) may be computed and compared to reference metrics or thresholds, such as for changes over time or in comparison to a standard to determine the presence or absence of a physiological state of interest or of a change in such state.
Abstract:
The embodiments disclosed herein relate generally to magnetic resonance imaging systems and, more specifically, to the manufacturing of a gradient coil assembly for magnetic resonance imaging (MRI) systems. For example, in one embodiment, a method includes ultrasonically consolidating a plurality of sheets of a conductive material to form a consolidated structure and machining one or more conductive channels into the consolidated structure to form an inductor.