| Popis: |
Compared to the conventional finger photoplethysmography (PPG) sensor that is widely used in clinical practice to assess arterial blood oxygen saturation and heart rate, an imaging PPG (IPPG) system can remotely provide multiple contactless measurements across large areas of the body to give valuable vascular and cardiovascular information. The IPPG technique is noncontact and can be a low cost and easy to use tool for medical diagnostics as well as in biological-medical research of the cardiovascular system. The technology and optical modeling relating to this technique continue to be developed, but already IPPG can provide potentially useful information for investigating a number of clinical and physiological conditions. In this chapter, we will overview a range of different IPPG applications, particularly beyond the standard PPG assessment of pulse oximetry, and the monitoring of heart and respiratory rates. These applications include the intraoperative monitoring of cerebral microcirculation, the visualization of skin capillary function across the body, assessing the circulatory-system reactivity in response to functional testing, evaluating the functional reserve of cerebral and musculocutaneous vessels, instrumental identification of scleroderma, and the contactless assessment of endothelial function. |
