Electrooptical tomographic system for 2-dimensional image reconstruction from projections.

摘要

Two major processes are involved in reconstructing an image from its projections using the filtered backprojection method: applying a frequency domain magnitude filter and a backprojection integration. These two processes can be carried out electro-optically by utilizing an electro-optical feedback system, which produces backprojection, and an electro-optical data processor, which is capable of implementing the magnitude filter in the frequency domain. The advantages of this electro-optical tomographic system over its digital counterpart and over previous optical and electro-optical systems is its speed of reconstruction (20 frames/second with current high speed imaging systems), noise immunity and it does not require mechanical or magnetic components to rotate, translate or shift images.