Computer-based systems and methods are disclosed for translation of a spoken presentation along with the accompanying presentation materials. One embodiment includes a housing piece and an interfitting piece. The method further includes reconstructing images of the uniform phantom using a PET imaging system and determining a geometric calibration for the PET imaging system based on a comparison of the reconstructed images and the reference images. This allows malware to be detected or removed, even if it has affected the first operating system in some way in order to evade detection or removal. In addition, an adjusting block is arranged to adjust the planetary gear carrier pack to secure the planetary gear carrier pack. In another embodiment, there are two membranes utilized for manipulating optical signals.