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An FFT based Fast Reconstruction Algorithm for 3D Computed Tomography

Abhishek Mitra, Swapna Banerjee


An FFT based parallel reconstruction algorithm is proposed for Spiral/helical CT where the sinogram data of a 3D object is collected by convolving it with 2D line and function that results in a simple 3D reconstruction algorithm, which possesses high level of regularity and concurrency in its computational flow. The 3D object has also been split into two angular parts (with respect to X-Y axes) to avoid the signal aliasing effect in the collected sinogram data. It has been found that the quality of the reconstructed images is quite comparable to that of the existing reconstruction algorithm when applied to Helical/Spiral CT system.


Computed Tomography, 3D reconstruction, Parallel algorithm, Computational complexity, Spiral/Helical CT.

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