Development of Optical Tomography System Based on Fan-Beam Lasers

Abstract

The sensor configuration and the sensitivity matrix are two key factors for the optical tomography system. In this work, these two factors are investigated to develop an optical tomography system. First, different sensor configurations are investigated, and their reconstruction performance is estimated. The regular configuration with 25 laser emitters and 25 detectors is selected due to its high reconstruction accuracy and simple structure. Meanwhile, the influence of the pixel grid on the reconstruction performance is also considered. Simulation results indicate that the pixel grid of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$50\times50$ </tex-math></inline-formula> is appropriate when the diameter of the region of interest (ROI) is 100 mm, while a denser grid will deteriorate the performance. A practical tomography system is developed based on the <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$25\times25$ </tex-math></inline-formula> configuration with fan-beam laser diodes and plastic fibers as light detectors. The reconstruction experiments are implemented based on the suggested <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$50\times50$ </tex-math></inline-formula> pixel grid. Experimental results verify that the effectiveness of the developed system and different distributions can be clearly reconstructed.