Because of the performance limitations of scanners that used parallel beams of X-rays, engineers were obliged to modify the design of this system. However, the fact remains that all new generation CT scanners are based on parallel-beam image reconstruction algorithms. So, rather than algorithms dictated by the actual geometry of their projection systems, in most new image reconstruction techniques we use parallel beam methods.
Reconstructed Image Projection Function Window Function Projection System Attenuation Function
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