Fast Calculation of Digitally Reconstructed Radiographs using Parallelism

This study takes a look at different DRR generation methods for use in intensity based 2D/3D Image Registration. A specific emphasis is placed on whether the methods are trivially parallelisable with the aim to take advantage of hardware systems with more than one CPU. The ray casting algorithm and light field rendering are found to be suitable for this purpose. A discussion on the parallelisation of algorithms using OpenMP is presented and followed by performance measurements for the ray casting algorithm. A significant performance increase in the ray casting algorithm is achieved.