Spectrometric systems and methods for improved focus localization of time- and space-varying measurements
First Claim
1. A method for measurement of a beat-to-beat cardiac stroke volume variation of a living body with a spectrometric system that includes at least one transmitter and at least one receiver, the method comprising:
- disposing the at least one transmitter on a surface of a region-of-interest (ROI) of the body, the ROI including a peripheral artery, and placing the at least one receiver on the body;
performing an oximetry measurement to acquire, with a data-processing circuitry of the spectrometric system, a time-dependent output from the at least one receiver caused by the at least one transmitter'"'"'s emission of at least one electromagnetic wave (EMW) at at least one corresponding wavelength,wherein the time-dependent output represents time-dependent changes of a concentration of oxygen in arterial blood of the peripheral artery, of the ROI, determined along a path from the at least one transmitter to the at least one receiver, said path defined by a gradient of the concentration of oxygen in said arterial blood;
from the time-dependent output, creating a waveform that is a surrogate for a pulse pressure in an aorta; and
from changes in the waveform, identified as a function of time, determining the beat-to-beat cardiac stroke volume variation.
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Abstract
A system and method of dynamically localizing a measurement of parameter characterizing tissue sample with waves produced by spectrometric system at multiple wavelengths and detected at a fixed location of the detector of the system. The parameter is calculated based on impulse response of the sample, reference data representing characteristics of material components of the sample, and path lengths through the sample corresponding to different wavelengths. Dynamic localization is effectuated by considering different portions of a curve representing the determined parameter, and provides for the formation of a spatial map of distribution of the parameter across the sample. Additional measurement of impulse response at multiple detectors facilitates determination of change of the measured parameter across the sample as a function of time.
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Citations
15 Claims
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1. A method for measurement of a beat-to-beat cardiac stroke volume variation of a living body with a spectrometric system that includes at least one transmitter and at least one receiver, the method comprising:
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disposing the at least one transmitter on a surface of a region-of-interest (ROI) of the body, the ROI including a peripheral artery, and placing the at least one receiver on the body; performing an oximetry measurement to acquire, with a data-processing circuitry of the spectrometric system, a time-dependent output from the at least one receiver caused by the at least one transmitter'"'"'s emission of at least one electromagnetic wave (EMW) at at least one corresponding wavelength, wherein the time-dependent output represents time-dependent changes of a concentration of oxygen in arterial blood of the peripheral artery, of the ROI, determined along a path from the at least one transmitter to the at least one receiver, said path defined by a gradient of the concentration of oxygen in said arterial blood; from the time-dependent output, creating a waveform that is a surrogate for a pulse pressure in an aorta; and from changes in the waveform, identified as a function of time, determining the beat-to-beat cardiac stroke volume variation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification