Effect of Field of View on Detection of Condyle Bone Defects Using Cone Beam Computed Tomography

Abstract

In maxillofacial imaging, cone beam computed tomography (CBCT) is currently the modality of choice for assessment of bony structures of the temporomandibular joint (TMJ). Factors affecting the quality of CBCT images can change its diagnostic accuracy. This study aimed to assess the effect of field of view (FOV) and defect size on the accuracy of CBCT scans for detection of bone defects of the TMJs. This study was conducted on 12 sound TMJs of 6 human dry skulls. Erosions and osteophytes were artificially induced in 0.5, 1, and 1.5-mm sizes on the anterior-superior part of the condyle; CBCT scans were obtained with 6, 9, and 12-inch FOVs by NewTom 3G CBCT system. Two maxillofacial radiologists evaluated the presence/absence and type of defects on CBCT scans. The Cohen kappa was calculated to assess intra- and interobserver reliability. The Mann-Whitney U test was applied to compare the diagnostic accuracy of different FOVs.In comparison of 6- and 12-inch, 9- and 12-inch FOVs in detection of different sizes of erosive lesions, difference was significant (P <0.05), whereas difference between 6- and 9 inch just in 0.5-mm erosive lesion was significant (P = 0.04). In comparison of 6- and 12-inch FOVs in detection of different sizes of osteophyte lesion, difference was significant (P < 0.05), whereas between 6- and 9-inch FOVs statistically significant difference was not observed (P > 0.05). The highest and the lowest diagnostic accuracy of CBCT scans for condyle defects were obtained with 6-inch and 12-inch FOVs, respectively. Diagnostic accuracy of CBCT scans increased with an increase in size of bone defects.

Comparative assessment of condylar position in patients with temporomandibular disorder (TMD) and asymptomatic patients using cone-beam computed tomography

“…2 It is estimated that 6-12% of Americans suffer from TMD symptoms. 3 According to the American Dental Association (ADA) guidelines, TMD comprise a triad of the temporomandibular joint (TMJ) pain, TMJ sounds during jaw function, and deviation or restriction of mandibular movements. 4 The research diagnostic criteria for temporomandibular disorders (RDC/TMD) have been the most frequently employed diagnostic protocol for TMD research since its publication in 1992.…”

Evaluation of the efficacy of the metal artifact reduction algorithm in the detection of a vertical root fracture in endodontically treated teeth in cone-beam computed tomography images: An in vitro study

“…7 Cone-beam computed tomography systems with a small FOV provide images of higher quality and lower artifact incidence compared to CBCT systems with a large FOV. 8,9 Cone-beam computed tomography has been suggested as an efficient diagnostic modality for complex root canal treatment and for the assessment of the root canal system. 10,11 Recently, CBCT has been recommended as an efficient modality for the detection of vertical root fractures (VRFs) due to its numerous advantages.…”

Influence of acquisition parameters on the evaluation of mandibular third molars through cone beam computed tomography

“…Comparing our results with those from studies assessing the influence of FOV on the diagnosis of such conditions as periapical diseases and temporomandibular joint pathologies, some have reached similar conclusions, 26-28 and some have not. [29][30][31][32] As the anatomic structures evaluated in these studies were different from those assessed in our study, it is rather difficult to establish a straightforward comparison. However, we were able to identify the influence of FOV size on the radiation dose, in agreement with another report.…”