Effect of Field of View on Detection of Condyle Bone Defects Using Cone Beam Computed Tomography.
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.
*Department of Oral and Maxillofacial Radiology, Dental School†Modeling of Noncommunicable Disease Research Center, Department of Biostatistics and Epidemiology, Hamadan University of Medical Sciences, Hamadan‡Department of Anatomy, Isfahan University of Medical Sciences, Isfahan§Department of Oral and Maxillofacial Radiology, Dental School, Guilan University of Medical Sciences, Rasht||Department of Prosthodontics, Dental School, Hamadan University of Medical Sciences, Hamadan, Iran.
Fatemeh
F
Salemi
Abbas
A
Shokri
Fatemeh Hafez
FH
Maleki
Maryam
M
Farhadian
Gholamreza
G
Dashti
Farzane
F
Ostovarrad
Hadi
H
Ranjzad
D054893:Cone-Beam Computed Tomography / Q000379:methods*; D006801:Humans; D015588:Observer Variation; D010015:Osteolysis, Essential / Q000000981:diagnostic imaging; D054850:Osteophyte / Q000000981:diagnostic imaging; D011856:Radiographic Image Enhancement / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric; D013704:Temporomandibular Joint / Q000000981:diagnostic imaging*; D013705:Temporomandibular Joint Disorders / Q000000981:diagnostic imaging*