title: Accuracy of Cone Beam Computed Tomography, Photostimulable Phosphor Plate Digital Radiography and Conventional Radiography for Detection of Artificial Cancellous Bone Defects.
abstract: OBJECTIVE
  The optimal goal of radiography is to provide high-quality diagnostic images with the least patient radiation dose. The aim of this study was to evaluate the accuracy of cone-beam computed tomography (CBCT) and intraoral photostimulable phosphor plate (PSP) digital and film-based conventional radiography for detection of artificial cancellous bone defects.
  
  
  METHODS
  Five dry human mandibles were used in this study. The mandibles were placed inside a water bath made of plexiglass plates; then PSP and CBCT scans were obtained. The mandibles were cut by a coping saw in buccolingual dimension and oval defects measuring 6.1×6.1 mm, 3×6.1 mm and 4×4 mm were created by a milling machine in the spongy bone. After fixing the two parts together (buccal and lingual), radiographs were repeated. Presence or absence of defects on images was evaluated and recorded by the two observers. Using SPSS 16, compatibility level, sensitivity, specificity and receiver operating curve (ROC) analysis were determined for each observer.
  
  
  RESULTS
  The intraobserver agreement in all three imaging modalities was low to moderate (kappa≤0.613). The inter-observer agreement in all the three imaging modalities was moderate (kappa=0.406). The area under the curve (AUC) of the imaging modalities in each observation was not significantly different. The area under the curve based on defect size for the two observers was not significantly different either.
  
  
  CONCLUSIONS
  Defects confined to spongy bone can be identified on film and PSP radiographs and CBCT scans. However, interpretation of PSP images and CBCT scans needs greater expertise and skills.
authors: Assistant Professor, Department of Oral and Maxillofacial Radiology, Qazvin University of Medical Sciences, Qazvin, Iran.
authors: Roghieh
authors: R
authors: Bardal
authors: Associate Professor, Department of Children Growth and Development Center, Qazvin University of Medical Sciences, Qazvin, Iran.
authors: Hassan
authors: H
authors: Jahanihashemi
authors: Assistant Professor, Department of Oral and Maxillofacial Radiology, Urmia University of Medical Sciences, Urmia, Iran.
authors: Maryam
authors: M
authors: Mostafavi
authors: General Practitioner at Shahid Bolandian Health Center, Qazvin, Iran.
authors: Esmaeil
authors: E
authors: Kalhor
authors: Associate Professor, Department of Oral and Maxillofacial Radiology, Qazvin University of Medical Sciences, Qazvin, Iran.
authors: Maryam
authors: M
authors: Tofangchiha
authors: Assistant Professor, Department of Oral and Maxillofacial Radiology, Yazd University of Medical Sciences, Yazd, Iran.
authors: Mahdieh
authors: M
authors: Dehghani
keywords: Bone and Bones; Cone-Beam Computed Tomography; Dimensional Measurement Accuracy; Radiography, Dental, Digital