Determining blood flow using laser speckle imaging
AssigneeCovidien LP
InventorsSean Michael White, Bruce Yee Yang, Tyler Bywaters Rice
Life of this patent
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Abstract
In some examples, a system includes processing circuitry configured to generate a laser speckle contrast signal based on a received signal indicative of detected light, wherein the detected light is scatted by tissue from a coherent light source. The processing circuitry may also determine, from the laser speckle contrast signal, a flow value and determine, from the laser speckle contrast signal, a waveform metric. Based on the flow value and the waveform metric, the processing circuitry may determine a blood flow metric for the tissue and output a representation of the blood flow metric.
Claims20
A system comprising:
- light drive circuitry configured to cause a coherent light source to emit light of a single wavelength;
- light detection circuitry configured to generate a signal indicative of detected light;
- processing circuitry configured to:
- control the light drive circuitry to cause the coherent light source to emit the light of the single wavelength;
- receive, from the light detection circuitry, the signal indicative of the detected light scattered from the light of the single wavelength;
- generate a laser speckle contrast signal based on the signal indicative of the detected light, the detected light scattered by tissue of a subject and from the coherent light source that emitted the light of the single wavelength;
- determine, from the laser speckle contrast signal, a flow value;
- determine, from the laser speckle contrast signal, a waveform metric;
- determine, based on both the flow value and the waveform metric, a blood flow metric for the tissue;
- and
- output, for display at a display device, a representation of the blood flow metric.
A method comprising:
- controlling, by processing circuitry, light drive circuitry configured to cause a coherent light source to emit light of a single wavelength;
- generating, by light detection circuitry, a signal indicative of detected light scattered from the light of the single wavelength;
- receiving, by the processing circuitry and from the light detection circuitry, the signal indicative of detected light;
- generating, by the processing circuitry, a laser speckle contrast signal based on a the signal indicative of the detected light, the detected light scattered by tissue of a subject and from the coherent light source that emitted the light of the single wavelength;
- determining, by the processing circuitry and from the laser speckle contrast signal, a flow value;
- determining, by the processing circuitry and from the laser speckle contrast signal, a waveform metric;
- determining, by the processing circuitry and based on both the flow value and the waveform metric, a blood flow metric for the tissue;
- and
- outputting, by the processing circuitry and for display at a display device, a representation of the blood flow metric.
A non-transitory computer-readable medium comprising instructions that, when executed, causes processing circuitry to:
- control light drive circuitry to cause a coherent light source to emit light of a single wavelength;
- receive, from light detection circuitry, a signal indicative of detected light, wherein the light detection circuitry is configured to generate the signal indicative of the detected light;
- generate a laser speckle contrast signal based on the signal indicative of the detected light, the detected light scattered by tissue of a subject and from the coherent light source that emitted the light of the single wavelength;
- determine, from the laser speckle contrast signal, a flow value;
- determine, from the laser speckle contrast signal, a waveform metric;
- determine, based on both the flow value and the waveform metric, a blood flow metric for the tissue;
- and
- output, for display at a display device, a representation of the blood flow metric.
Dependencies are inferred from the claim text.