The variance of bladder and rectal doses calculated from orthogonal and simple stereo films in cervix high-dose-rate brachytherapy

The degradation of image quality for lateral images used to reconstruct cervix applicators does not result in loss of precision in the dose estimates to organs at risk when using the orthogonal technique. However, the skin dose from the lateral image increases markedly with increasing patient separation, making the simple stereo technique a better option for large patients.