US 10,307,106 B2 · Systems and methods for estimating and removing magnetic resonance imaging gradient field-induced voltages from electrophysiology signals

Abstract

Systems and methods for estimating time-dependent voltages that are induced in electrophysiological monitoring systems by magnetic field gradients generated during a magnetic resonance imaging (“MRI”) scan are provided. The gradient-induced voltages are subsequently removed from signals acquired with the electrophysiological monitoring system during an MRI scan. As an example, the electrophysiological monitoring system can include an electrocardiography (“ECG”) system, an electroencephalography (“EEG”) system, an electromyography (“EMG”) system, a voltage device tracking (“VDT”) system, and so on. The gradient-induced voltages are estimated using a two-step procedure in which a learning algorithm is used to determine fitting parameters to be used in a model of the gradient-induced voltages. The fitting parameters are then used together with the model to extract the gradient-induced voltages from signals acquired during an MRI scan. The gradient-induced voltages can then be removed from the acquired signals.

Claims14

Dependent claims

A method for correcting electrophysiology signals by removing voltages induced by magnetic field gradients generated by a magnetic resonance imaging (MRI) system, the steps of the method comprising:

(a) providing gradient waveforms;
(b) computing derivatives of the provided gradient waveforms;
(c) acquiring electrophysiology signals from a subject positioned in the MRI system while the MRI system is generating magnetic field gradients based on the provided gradient waveforms;
(d) estimating fitting parameters for a physical model of gradient-induced voltages;
(e) estimating voltages induced by the generated magnetic field gradients by fitting the provided gradient waveforms, the computed derivatives of the gradient waveforms, and the estimated fitting parameters to the physical model of gradient-induced voltages;
(f) removing the estimated gradient-induced voltages from the acquired electrophysiology signals to produce corrected electrophysiology signals;
and
(g) displaying the corrected electrophysiological signals on a display.

5 more elements

A system for correcting electrophysiology signals affected by magnetic field gradients generated by a magnetic resonance imaging (MRI) system, the system comprising:

an input configured to receive electrophysiology signals acquired from a subject positioned in an MRI system;
at least one processor configured to:
i) to receive gradient waveforms from the input;
ii) compute derivatives of the received gradient waveforms;
iii) estimate fitting parameters for a physical model of gradient-induced voltages;
iv) estimate voltages induced by the generated magnetic field gradients by fitting the gradient waveforms, the computed derivatives of the gradient waveforms, and the estimated fitting parameters of the physical model of gradient-induced voltages;
v) remove the estimated gradient-induced voltages from the acquired electrophysiology signals to produce corrected electrophysiology signals;
and
vi) generate a report using the corrected electrophysiology signals.

6 more elements

Dependencies are inferred from the claim text.

Systems and methods for estimating and removing magnetic resonance imaging gradient field-induced voltages from electrophysiology signals

Life of this patent

Systems and methods for estimating and removing magnetic resonance imaging gradient field-induced voltages from electrophysiology signals

Life of this patent

Abstract

Claims14