Abstract: Tomographic image reconstruction is computational very demanding. In filtered backprojection as well as in iterative reconstruction schemes, the most time–consuming steps usually are the forward– and backprojection.
We here present the performance results achieved with a high performance 3D parallel beam backprojection algorithm that was optimized for Intel’s new Sandy Bridge EP architecture.
Compared to a “naïve” straight forward implementation our optimized algorithm uses Sandy Bridge’s enhanced vector capabilities, i.e. its 256 bit vector instruction set AVX to backproject 8 images simulta-neously and an optimized memory layout in order to fully exploit the computational power of Sandy Bridge and thereby to reduce reconstruction time.