1. Brazilian Health Ministry, 1998. Federal Resolution 453: Diretrizes básicas de proteção radiológica em radiodiagnóstico médico e odontológico. Brasília, Diário Oficial da União, 2 June.
2. Radiologic Science for Technologists: Physics Biology and Protection;Bushong,1997
3. Performance evaluation and testing of digital intra-oral radiographic systems;Doyle;Radiat. Prot. Dosim.,2006
4. European Commission, 2004. European guidelines on radiation protection in dental radiology: the safe use of radiographs in dental practice. Issue no. 136, Victoria University of Manchester, UK.
5. Assessing the image quality of CCD-based digital intraoral radiography system: application of perceptibility curve test;Hayakawa;Bull. Tokyo Dent. Coll.,2000