Development of an optically emulated computed tomography scanner for college education

Area of Science:

• Medical Imaging
• Optical Engineering
• Computational Imaging

Background:

• Conventional computed tomography (CT) systems utilize X-rays, posing risks of radiation exposure and high costs.
• These limitations restrict the use of traditional CT scanners in educational settings and resource-limited environments.
• There is a need for safer, more accessible imaging technologies.

Purpose of the Study:

• To develop a compact, low-cost, optically-based computed tomography (CT) scanner.
• To demonstrate the feasibility of using visible light for noninvasive imaging of semi-transparent specimens.
• To provide an alternative to X-ray based CT for educational and low-resource applications.

Main Methods:

• A novel CT scanner was constructed using a rotating stage, backlight illumination, and a digital camera within a light-isolated box.
• A microcontroller controlled the stage rotation, and image processing was performed using MATLAB and the inverse Radon transform.
• The system was tested using a lemon slice to image internal structures.

Main Results:

• The optically-emulated CT scanner successfully imaged internal features of a lemon slice, including peel, pulp, and seeds.
• Both 2D and 3D visualizations of the specimen's internal structure were achieved.
• The system demonstrated the capability to resolve fine details noninvasively.

Conclusions:

• The developed optical CT scanner offers a safe, affordable, and effective platform for demonstrating CT principles.
• This technology has significant potential for applications in science education, industrial inspection, and visual computing.
• Optical emulation provides a viable alternative to conventional X-ray CT for specific imaging tasks.