In the dental radiology there are several possibilities for medical imaging. One of them is the panoramic radiography which have become an integral part of it within the last years. Another technique in the dental imaging is the cone beam computed tomography which is a newer development. Due to lower acquisition costs and less radiation exposure the panoramic radiography is more common than cone beam computed tomography. But as the panoramic radiography only generates two-dimensional images and contorting and covering effects can occur, it’s especially for certain indications and complex surgical planning not suitable. In this case the usage of three-dimensional techniques is more beneficial. As an alternative to a conventional CT a cone beam computed tomography can be applied. This method only needs one rotation to catch the complete scanning range, what causes much less radiation exposure to the patient compared to a CT. Furthermore, a cone beam computed tomography allows three-dimensional imaging and image reconstructions. For this reason it is a suitable technique for complex surgical planning, as dental implantology or extractions of wisdorn teeth. But due to the finishing of the images is this procedure very time-consuming. Further to that the radiation exposure is far higher than the usage of a conventional panoramic radiograph.
For this reason it is very important to know the differences of radiation exposure between panoramic radiography and cone beam computed tomography – on the one hand, to take the correct radiation protection measures and on the other hand, to decide which imaging technique is required.
This thesis contains a comparison of studies, which explored the radiation exposure of panoramic radiographs and cone beam computed tomographs. Criteria that effect the radiation dose are the scanning range, the tube voltage and current, the exposure time and finally the sensibility of the image receptor. Measures to reduce the radiation exposure are among other things wearing a thyroid shield and leaded glasses.