Systems and methods using induced perturbation to determine physiological parameters

A system for monitoring blood pressure comprising:

• an exciter capable of inducing a perturbation signal in a subject's body;
• a sensor capable of generating a detected signal from the subject's body;
• and
• a processor capable of:
• transforming the detected signal using a continuous wavelet to generate a scalogram, wherein the scalogram comprises three dimensional data, wherein a first dimension of the scalogram corresponds to time, wherein a second dimension of the scalogram corresponds to scale, and wherein a third dimension of the scalogram corresponds to phase;
• determining, from the scalogram, a phase that corresponds to a particular time and scale;
• determining, based at least in part on the phase and the perturbation signal, a phase difference;
• and
• determining, based at least in part on the determined phase difference, a blood pressure measurement.

A non-transitory computer-readable medium for use in detecting an artifact in a signal, the computer-readable medium having computer program instructions recorded thereon for:

• inducing a perturbation signal in a subject's body;
• detecting a signal from the subject's body;
• transforming the detected signal using a continuous wavelet transform to generate a scalogram, wherein the scalogram comprises three dimensional data, wherein a first dimension of the scalogram corresponds to time, wherein a second dimension of the scalogram corresponds to scale, and wherein a third dimension of the scalogram corresponds to phase;
• determining, from the scalogram, a phase that corresponds to a particular time and scale;
• determining, based at least in part on the phase and the perturbation signal, a phase difference;
• and
• determining, based at least in part on the determined phase difference, a blood pressure measurement.