Development of computer application for determination of chemical diffusion properties in biological tissues

• Author(s): Peixoto, Pedro Miguel Ferreira
• Date: 2015
• Persistent ID: http://hdl.handle.net/10400.22/8257
• Origin: Repositório Científico do Instituto Politécnico do Porto
• Subject(s): Diffusion times; Optical clearing agents; Muscle
• Document Type: Master thesis
• Language: English
• Advisor(s): Oliveira, Luís Manuel Couto de
• Contributor(s): Repositório Científico do Instituto Politécnico do Porto

Description

The main objective of this work was to develop an application capable of determining the diffusion times and diffusion coefficients of optical clearing agents and water inside a known type of muscle. Different types of chemical agents can also be used with the method implemented, such as medications or metabolic products. Since the diffusion times can be calculated, it is possible to describe the dehydration mechanism that occurs in the muscle. The calculation of the diffusion time of an optical clearing agent allows to characterize the refractive index matching mechanism of optical clearing. By using both the diffusion times and diffusion of water and clearing agents not only the optical clearing mechanisms are characterized, but also information about optical clearing effect duration and magnitude is obtained. Such information is crucial to plan a clinical intervention in cooperation with optical clearing. The experimental method and equations implemented in the developed application are described in throughout this document, demonstrating its effectiveness. The application was developed in MATLAB code, but the method was personalized so it better fits the application needs. This process significantly improved the processing efficiency, reduced the time to obtain he results, multiple validations prevents common errors and some extra functionalities were added such as saving application progress or export information in different formats. Tests were made using glucose measurements in muscle. Some of the data, for testing purposes, was also intentionally changed in order to obtain different simulations and results from the application. The entire project was validated by comparing the calculated results with the ones found in literature, which are also described in this document.