*Review* **Scattering of Light from the Systemic Circulatory System**

#### **Sidra Batool 1,\*, Mehwish Nisar 1,2, Fabio Mangini 3, Fabrizio Frezza 1 and Eugenio Fazio 2**


Received: 19 October 2020; Accepted: 23 November 2020; Published: 30 November 2020

**Abstract:** There are many factors of methodological origin that influence the measurement of optical properties of the entire circulatory system which consists of blood as the basic component. The basic idea of this review article is to provide the optical properties of the circulatory system with all those factors of influence that have been employed in biomedical optics for different applications. We begin with the available optical properties, i.e., absorption, scattering and, reduced scattering coefficient, in general for any tissue inside the human body and prominent scattering theories (e.g., light, X-rays, neutrons) that are helpful in this regard. We have reviewed and compiled already available formulas and their respective available data for different human tissues for these optical properties. Then we have descended to the blood composition and to different scattering techniques available in the literature to study scattering and light propagation inside blood. We have reviewed both computational and theoretical scattering techniques.

**Keywords:** optical properties; scattering theories; circulatory system
