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Diagnostic accuracy of limited‐volume cone‐beam computed tomography in the detection of periapical bone loss: 360° scans versus 180° scans
Author(s) -
Len S.,
Patel S.,
Foschi F.,
Wilson R.,
Davies J.,
Mannocci F.
Publication year - 2011
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2011.01930.x
Subject(s) - cone beam computed tomography , nuclear medicine , medicine , receiver operating characteristic , computed tomography , diagnostic accuracy , tomography , volume (thermodynamics) , radiology , physics , quantum mechanics
Lennon S, Patel S, Foschi F, Wilson R, Davies J, Mannocci F. Diagnostic accuracy of limited‐volume cone‐beam computed tomography in the detection of periapical bone loss: 360° scans versus 180° scans. International Endodontic Journal , 44 , 1118–1127, 2011. Abstract Aim To investigate the effect of reducing limited‐volume cone‐beam computed tomographs arc of rotation from 360° to 180° on the ability to diagnose small, artificially created apical lesions. Methodology Small, artificial apical bone lesions were prepared with a bur in the apical region of the distal root of ten mandibular first molars, in human dry mandibles. The jaws were scanned in a fixed position with limited‐volume CBCT making a 360° and 180° arc of rotation, before and after each periapical lesion had been created. A 4 × 4 cm field of view was used at 90 kV, with a current of 4 mA. Ten examiners blinded to the scan parameters and controls scored the presence/absence of bone lesions. Intra‐examiner reliability was determined after 2 weeks, reviewing half the data set. Statistical analyses with paired t ‐tests determined the diagnostic accuracy of the two modalities (360° vs. 180°) in terms of sensitivity, specificity, receiver operating characteristic area under the curve, positive predictive values and negative predictive values. Results The mean values for sensitivity of the 360° and 180° scans were 0.91 and 0.89, respectively; their mean specificities were 0.73. No significant differences were reflected in the statistical analyses. Conclusions Both 360° and 180° cone‐beam computed tomography scans yielded similar accuracy in the detection of artificial bone lesions. The use of 180° scans might be advisable to reduce the radiation dose to the patient in line with the ICRP guidance to use as low a dosage as reasonably achievable.