Patent ID: 11918329
Assignee: PIXART IMAGING INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 9:
10. A physiological detection system, comprising:
a first array photoplethysmography (PPG) detector, comprising a plurality of first pixel areas and configured to be attached to a first tissue area of a body to correspondingly generate a plurality of first PPG signals;
a second array PPG detector, comprising a plurality of second pixel areas and configured to be attached to a second tissue area, different from the first tissue area, of the body to correspondingly generate a plurality of second PPG signals;
a display configured to show a detected result of the physiological detection system; and
a processing unit configured to
convert the plurality of first PPG signals and the plurality of second PPG signals to a first 3D energy distribution and a second 3D energy distribution, respectively;
compare the first 3D energy distribution and the second 3D energy distribution with an energy threshold,
calculate a first area of the first 3D energy distribution having energy amplitudes larger than the energy threshold and a second area of the second 3D energy distribution having energy amplitudes larger than the energy threshold, and
when a variation of a ratio between the first area and the second area exceeds a variation threshold, control the display to show an alert message indicating that superficial microcirculations at the first and second tissue areas of body are different indicating the superficial microcirculations at one of the first and second tissue areas has become worse.