A VR software was developed on a personal computer, with models of a patient, an X-ray machine and a detector. The model of the patient was derived from data from a CT examinationof a dry skull. Simulated radiographic images of the patient model could be rendered as perspectiveprojections based on the relative positions between the models. The projection geometry of thesoftware was validated by developing an artificial CT data set containing high attenuation points asobjects to be imaged. The accuracy in projection geometry was evaluated in a systematic way. Thedistances between two dots, representing the projected test points in the simulated radiographicimages, were measured. They were compared with theoretical calculations of the correspondingdistances using traditional mathematical tool。 ...
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