RBC Dataset

Photoplethysmography (PPG) is a low cost non-invasive

optical technique that can be used to assess changes in tissue

blood volume [6]. This method provides valuable information

related to the cardiovascular system. The tissue's region is

illuminated using a light source and a photodetector records

the reflected light, which varies depending on the presence

and concentration of RBCs and their oxygenation levels.

Depending on the oxygenation level of hemoglobin, RBCs

absorb light in different ways. When blood volume in the

microvascular bed increases, more light is absorbed due to the

higher concentration of RBCs. As a result, less light can reach

the detector. When blood volume decreases, less light is

absorbed, which causes the detected light intensity to increase.

A measurement of the amount of light that is consistently

absorbed in response to variations in blood volume within the

circulatory system can yield the PPG signal