fa Influence of anatomical location on CT numbers in cone beam computed tomography رادیولوژی دهان، فک و صورت Oral and Maxillofacial Radiology پژوهشي Research <p> <strong>Objective</strong></p><p>  To assess the influence of anatomical location on computed tomography (CT) numbers in mid- and full field of view (FOV) cone beam computed tomography (CBCT) scans. </p><p> <strong>Study Design</strong></p><p>  Polypropylene tubes with varying concentrations of dipotassium hydrogen phosphate (K2HPO4) solutions (50-1200mg/mL) were imaged within the incisor, premolar, and molar dental sockets of a human skull phantom. CBCT scans were acquired using the NewTom 3G and NewTom 5G units. The CT numbers of the K2HPO4 phantoms were measured, and the relationship between CT numbers and K2HPO4 concentration was examined. The measured CT numbers of the K2HPO4 phantoms were compared between anatomical sites.</p><p> <strong> Results</strong></p><p>  At all six anatomical locations, there was a strong linear relationship between CT numbers and K2HPO4 concentration (R 2 >0.93). However, the absolute CT numbers varied considerably with the anatomical location. </p><p> <strong>Conclusion</strong></p><p>  The relationship between CT numbers and object density is not uniform through the dental arch on CBCT scans. </p><hr><p></p><p> <strong>Source: </strong>Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology </p><p> <a href="http://www.oooojournal.net/article/S2212-4403(13)00049-7/abstract" target="_blank"><font color="#0000ff">Full Text</font></a></p> 0 0 http://idai.ir/browse.php?a_code=A-10-32-1593&slc_lang=fa&sid=1 Matheus L.Oliveira 10031947532846007385 10031947532846007385 No Department of Oral Diagnosis, Piracicaba Dental School, State University of Campinas, Campinas, São Paulo, Brazil Guilherme M.Tosoni 10031947532846007386 10031947532846007386 No Department of Oral Diagnosis and Surgery, Araraquara Dental School, São Paulo State University, Araraquara, São Paulo, Brazil David H.Lindsey 10031947532846007387 10031947532846007387 No School of Dentistry, University of California, Los Angeles, CA, USA Kristopher Mendoza 10031947532846007388 10031947532846007388 No School of Dentistry, University of California, Los Angeles, CA, USA Sotirios Tetradis 10031947532846007389 10031947532846007389 No Section of Oral and Maxillofacial Radiology, University of California, Los Angeles, CA, USA Sanjay M.Mallya 10031947532846007390 10031947532846007390 Yes Section of Oral and Maxillofacial Radiology, University of California, Los Angeles, CA, USA