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Oral Radiology

, Volume 35, Issue 1, pp 59–67 | Cite as

Evaluation of cone-beam computed tomography diagnostic image quality using cluster signal-to-noise analysis

  • Warangkana WeerawanichEmail author
  • Mayumi Shimizu
  • Yohei Takeshita
  • Kazutoshi Okamura
  • Shoko Yoshida
  • Gainer R. Jasa
  • Kazunori Yoshiura
Original Article

Abstract

Objectives

(1) We sought to assess correlation among four representative parameters from a cluster signal-to-noise curve (true-positive rate [TPR] corresponding to background noise, accuracy corresponding to background noise, maximum TPR, and maximum accuracy) and the diagnostic accuracy of the identification of the mandibular canal using data from observers in a previous study, under the same exposure conditions. (2) We sought to clarify the relationship between the hole depths of a phantom and diagnostic accuracy.

Methods

CBCT images of a Teflon plate phantom with holes of decreasing depths from 0.7 to 0.1 mm were analyzed using the FindFoci plugin of ImageJ. Subsequently, we constructed cluster signal-to-noise curves by plotting TPRs against false-positive rates. The four parameters were assessed by comparing with the diagnostic accuracy calculated from the observers. To analyze image contrast ranges related to detection of mandibular canals, we determined five ranges of hole depths, to represent different contrast ranges—0.1–0.7, 0.1–0.5, 0.2–0.6, 0.2–0.7 and 0.3–0.7 mm—and compared them with observers’ diagnostic accuracy.

Results

Among the four representative parameters, accuracy corresponding to background noise had the highest correlation with the observers’ diagnostic accuracy. Hole depths of 0.3–0.7 and 0.1–0.7 mm had the highest correlation with observers’ diagnostic accuracy in mandibles with distinct and indistinct mandibular canals, respectively.

Conclusions

The accuracy corresponding to background noise obtained from the cluster signal-to-noise curve can be used to evaluate the effects of exposure conditions on diagnostic accuracy.

Keywords

Signal detection, Psychological Image interpretation, Computer-assisted Cone-beam computed tomography Phantoms, Imaging Diagnostic imaging 

Notes

Acknowledgements

This work was supported by JSPS KAKENHI under Grant Number 15K11074.

Compliance with ethical standards

Conflict of interest

Warangkana Weerawanich, Yohei Takeshita, Shoko Yoshida and Gainer R Jasa declare that they have no conflict of interest. Mayumi Shimizu, Kazutoshi Okamura and Kazunori Yoshiura have received Grants from Japan Society for the Promotion of Science (15K11074).

Human and animal right statements

This article does not contain any studies with human or animal subjects performed by any of the authors.

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Copyright information

© Japanese Society for Oral and Maxillofacial Radiology 2018

Authors and Affiliations

  1. 1.Department of Oral and Maxillofacial Radiology, Faculty of Dental ScienceKyushu UniversityFukuokaJapan
  2. 2.Department of Oral and Maxillofacial Radiology, Faculty of DentistryMahidol UniversityBangkokThailand
  3. 3.Department of Oral and Maxillofacial RadiologyKyushu University HospitalFukuokaJapan
  4. 4.Department of Oral and Maxillofacial RadiologyOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesOkayamaJapan
  5. 5.Section of Image Diagnostics, Department of Diagnostics and General CareFukuoka Dental CollegeFukuokaJapan
  6. 6.Oral Radiology Division, Faculty of OdontologyUniversity of the RepublicMontevideoUruguay

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