Algorithms for calculation of DRRs for different accelerator voltages and tools for work with DRRs

The aim of this study was to develop algorithms for simulation of DRR calculation for different accelerator voltages. The authors also developed a number of useful tools for an application of DRRs in modern brachytherapy treatment planning. Modern brachytherapy treatment planning is image based and frequently used imaging modality is CT scanning. The authors use the CT-data set to form the three dimensional volumetric data set, whose each voxel is characterised with the characteristic CT-number given in Hounsfield units (HLT). From this volumetric data set the authors further calculate DRRs defined with a number of parameters selected by user. Clinical use of such developed DRRs is presented