Beam hardening correction tool improves the diagnosis of incipient caries lesions in Micro-ct images

Karla Rovaris, Saulo Sousa Melo, Polyane Mazucatto Queiroz, Carolina Loch, Donald R. Schwass, Francisco Haiter-Neto

Research output: Contribution to journalArticle

Abstract

Objective: To evaluate the effect of Beam Hardening Correction tool (BHC) on Micro-CT images used in the diagnosis of incipient caries lesions. Methods: Six posterior teeth, with 6 sound proximal surfaces and 6 natural white spot lesions, were scanned using a SkyScan1174 device. Each tooth was imaged 16 times in various acquisition parameters, and reconstructed 3 times applying different levels of BHC (0, 15 and 30%). The 288 datasets were analyzed by three examiners. Gold-standard was obtained by microscopic analyses under polarized light. Area under the ROC curve was obtained for each protocol and the BHC parameter was isolated to individually observe the influence of such parameters of reconstruction. Results: Microtomographic images were accurate for the diagnosis of incipient caries lesions even when the BHC tool was not applied. Accuracy was perfect in 50 % of the protocols without BHC. When adding the artefact correction, the number of protocols that reached perfect accuracy increased to 81.25%. No difference was found between the protocols that used 15 or 30% BHC. Statistically significant differences were found only in four comparisons, and on those the images that had BHC were more accurate. Two non-BHC protocols reached accuracy scores of 0.653 and 0.881, and were improved to perfect accuracy with BHC application. conclusion: The use of the BHC tool should be encouraged when using Micro-CT to detect incipient caries lesions, especially when low-quality parameters aiming less acquisition and processing time are used.

Original languageEnglish (US)
Article number20180123
JournalDentomaxillofacial Radiology
Volume48
Issue number1
DOIs
StatePublished - Jan 1 2019
Externally publishedYes

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Tooth
Dental Caries
ROC Curve
Gold
Artifacts
Area Under Curve
Light
Equipment and Supplies
Datasets

Keywords

  • Dental caries
  • Dentistry
  • Diagnostic imaging
  • Radiology
  • X-ray microtomography

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Radiology Nuclear Medicine and imaging
  • Dentistry(all)

Cite this

Beam hardening correction tool improves the diagnosis of incipient caries lesions in Micro-ct images. / Rovaris, Karla; Sousa Melo, Saulo; Queiroz, Polyane Mazucatto; Loch, Carolina; Schwass, Donald R.; Haiter-Neto, Francisco.

In: Dentomaxillofacial Radiology, Vol. 48, No. 1, 20180123, 01.01.2019.

Research output: Contribution to journalArticle

Rovaris, Karla ; Sousa Melo, Saulo ; Queiroz, Polyane Mazucatto ; Loch, Carolina ; Schwass, Donald R. ; Haiter-Neto, Francisco. / Beam hardening correction tool improves the diagnosis of incipient caries lesions in Micro-ct images. In: Dentomaxillofacial Radiology. 2019 ; Vol. 48, No. 1.
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abstract = "Objective: To evaluate the effect of Beam Hardening Correction tool (BHC) on Micro-CT images used in the diagnosis of incipient caries lesions. Methods: Six posterior teeth, with 6 sound proximal surfaces and 6 natural white spot lesions, were scanned using a SkyScan1174 device. Each tooth was imaged 16 times in various acquisition parameters, and reconstructed 3 times applying different levels of BHC (0, 15 and 30{\%}). The 288 datasets were analyzed by three examiners. Gold-standard was obtained by microscopic analyses under polarized light. Area under the ROC curve was obtained for each protocol and the BHC parameter was isolated to individually observe the influence of such parameters of reconstruction. Results: Microtomographic images were accurate for the diagnosis of incipient caries lesions even when the BHC tool was not applied. Accuracy was perfect in 50 {\%} of the protocols without BHC. When adding the artefact correction, the number of protocols that reached perfect accuracy increased to 81.25{\%}. No difference was found between the protocols that used 15 or 30{\%} BHC. Statistically significant differences were found only in four comparisons, and on those the images that had BHC were more accurate. Two non-BHC protocols reached accuracy scores of 0.653 and 0.881, and were improved to perfect accuracy with BHC application. conclusion: The use of the BHC tool should be encouraged when using Micro-CT to detect incipient caries lesions, especially when low-quality parameters aiming less acquisition and processing time are used.",
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