Abstract—Computed Tomography (CT) is a medical imaging technique which produces cross sectional images of human tissues representing their x-ray attenuation coefficients. The attenuation coefficients are recorded as projections for a given cross sectional slice of the body. Reconstruction of those projections yields the 2D image of the required slice. Depending on the mode of acquisition of projections, geometry of X-ray source and detectors, arrangement of detectors, there are many types of CT. The reconstruction algorithm for each type is different. In this paper, we created a set of phantom (cross sections of thoracic region), and acquired projections for them .Both conventional and spiral projections are acquired. Reconstruction of these projections is done and the final cross sectional images are compared for conventional CT and spiral CT. Matlab R2009a is used for simulation of phantoms, acquisition of projections and reconstruction of it and Image 1.44 is used for quantitative analysis.

Index Terms—Computed Tomography (CT), Conventional CT, Spiral CT, Phantom, Matlab, Image J

Cite: Prasath S., Marieswaran M., and Murugaboopathi G., "Reconstruction of Parallel and Fan Beam Projections for Biomedical Diagnosis," Journal of Medical and Bioengineering, Vol. 5, No. 2, pp. 119-123, April 2016. Doi: 10.18178/jomb.5.2.119-123