You are an IT specialist and should know that the quality of 3D reconstruction depends on the video card, software (Direct X, OpenGL), as well as the depth of scanning on new CT machines. Use Inobitech have suport MAC OS Inobitec DICOM Viewer / Downloads and Vidar Dicom Viewer 3 but windows OS Vidar Dicom Viewer - просмотр медицинских изображений to view Dicom CT and MRI files - they are a free trial, but Radiant and Slicer are much worse.