Fig. 3
From: GPU based parallel acceleration for fast C-arm cone-beam CT reconstruction
Stream processing scheme for FDK algorithm. Each volume voxel is considered as an element of the input data stream. The projection position calculation kernel provides each element a parallel thread to calculate the corresponding projections on the flat panel plane. The results form a new data stream as the input to the back projection kernel, which performs the back projection and calculate the value of the corresponding volume voxel parallelly