Abstract
Rotary blood pumps are commonly employed as circulatory support, which might cause changes in circulation in end organs. The purpose of this study was to develop a noninvasive and contactless system for measurement of peripheral perfusion by using a high-speed camera. A measurement system was designed to derive the amplitude of the green level (AGL). The static test of colour intensity was performed in vitro to verify the blood volume density in the materials. We employed a volume density model, which consisted of a polymer sponge under the different absorption condition using fresh goat blood. The sponge with blood was sandwiched between acrylic plates and the gap between them was varied by the linear table so that the density could be evaluated. The intensity of CCD data on the top flat plate was captured and analysed. As a result, the relationship between the density of blood and the CCD intensity could be evaluated under the LED lighting conditions. Therefore, it was indicated that the AGL could be reflected by the blood volume and the system by using a high-speed camera might be useful for measuring patients' perfusion under the pump support condition.
