IMAGE-BASED PWV MEASUREMENT DEVICE AND METHOD
First Claim
1. An image-based pulse wave velocity measurement device comprising:
- at least two light emitting units respectively projecting light beams to at least two detected regions;
at least two light transmitting units respectively receiving and transmitting light signals measured at the detected regions;
an image sensing unit arranged corresponding to the at least two light transmitting units and converting the light signals measured at the detected regions into image signals;
a length measurement unit, for measuring a distance between the detected regions; and
an image analysis unit connected with the image sensing unit, for analyzing the image signals to obtain two photoplethysmography (PPG) signals for the detected regions, and working out a pulse wave velocity (PWV) between the detected regions according to the distance between the two detected regions and a pulse transit time (PTT) from the two PPG signals.
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Abstract
An image-based PWV measurement device and method are provided. The measurement device comprises at least two light emitting units respectively projecting light beams to at least two detected regions on body surface; at least two light transmitting units respectively receiving and transmitting light signals measured at the different detected regions; an image sensing unit converting the light signals measured at the detected regions into image signals; a length measurement unit used to measure the distance between the detected regions; and an image analysis unit analyzing the image signals to obtain PPG signals for the detected regions. According to the PPG signals, the image analysis unit calculates the physiological parameters, including the perfusion index, respiration rate, pulse rate, stiffness index, reflection index, and PWV between the detected regions, which is derived according to the distance and the pulse transit time from the PPG signals of the two detected regions.
33 Citations
13 Claims
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1. An image-based pulse wave velocity measurement device comprising:
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at least two light emitting units respectively projecting light beams to at least two detected regions; at least two light transmitting units respectively receiving and transmitting light signals measured at the detected regions; an image sensing unit arranged corresponding to the at least two light transmitting units and converting the light signals measured at the detected regions into image signals; a length measurement unit, for measuring a distance between the detected regions; and an image analysis unit connected with the image sensing unit, for analyzing the image signals to obtain two photoplethysmography (PPG) signals for the detected regions, and working out a pulse wave velocity (PWV) between the detected regions according to the distance between the two detected regions and a pulse transit time (PTT) from the two PPG signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An image-based pulse wave velocity measurement method comprising the following steps:
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providing at least two detected regions and measuring a distance between the two detected regions; providing at least two light emitting units respectively projecting light beams to the detected regions; receiving and transmitting light signals measured at the detected regions, and converting the light signals into image signals; analyzing the image signals to obtain two photoplethysmography (PPG) signals for the detected regions; and working out a pulse wave velocity (PWV) between the two detected regions according to the distance between the two detected regions and a pulse transit time (PTT) from the two PPG signals. - View Dependent Claims (10, 11, 12, 13)
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Specification