Influence of sharpening filters on the detection of root fractures using low-dose cone-beam computed tomography

González, Alexandra Robles; Tosoni, Guilherme Monteiro; Freitas, Deborah Queiroz; Oliveira, Matheus Lima

doi:10.1007/s00784-022-04444-7

Cited by 6 publications

(5 citation statements)

References 31 publications

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“…Nevertheless, filters comparison among different software may not be straightforward as the manufacturers do not disclose their algorithm functioning. 25 In both studies, 8,18 the voxel size used (0.250 mm) was similar to the largest voxel in the present study (0.280 mm). However, other parameters differed: field of view (16 × 8 cm 8,18 vs. 5 × 5 cm in the present study) and kilovoltage (120 kVp 8,18 vs. 90 in the present study), which makes it difficult to compare with our results.…”

Section: Discussionsupporting

confidence: 59%

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Do voxel size and filter application on CBCT images improve the diagnosis of condylar morphological alterations? An ex vivo study

de Oliveira Reis,

Santos‐Corvini,

Gaêta‐Araujo

et al. 2023

J of Oral Rehabilitation

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BackgroundThere is no established protocol for the low doses of cone‐beam computed tomography (CBCT) acquisition and filter application on the diagnosis of condylar morphological alterations.ObjectivesThe objective of the study was to evaluate the influence of voxel size and filter application on the diagnosis of condylar morphological alterations in CBCT using an ex vivo model.MethodsCBCT scans of 36 temporomandibular joints were acquired using OP300 Maxio with voxel sizes of 0.085, 0.125 and 0.280 mm. Three radiologists evaluated the condyles in the CBCT volumes under three filter modes: no filter, ‘1x’ sharpen filter and ‘2x’ sharpen filter. The area under the ROC curve, sensitivity and specificity were calculated by comparing the evaluators' responses with the reference standard and compared among experimental groups using analysis of variance (ANOVA) (α = 5%).ResultsThe area under the ROC curve, sensitivity and specificity were not affected by voxel size and filter application (p > .05). For osteophyte and flattening, there were more true‐positive responses in smaller voxel size. For erosion, the increase of true‐ and false‐positive responses occurred with a larger voxel size. Overall, there was a tendency to decrease true positives for osteophyte and erosion and increase false positives for flattening with the ‘2x’ sharpen filter.ConclusionsThe diagnosis of condylar morphological alterations assessed in this ex vivo analysis is not influenced by the voxel size and the application of the filters. However, attention is needed with the occurrence of false‐positive diagnosis with a larger voxel size for erosion and ‘2x’ sharpen filter for flattening.

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Section: Discussionsupporting

confidence: 59%

“…Such different results may be influenced by different software applications, which may present different options for sharpening filters. Nevertheless, filters comparison among different software may not be straightforward as the manufacturers do not disclose their algorithm functioning 25 …”

Section: Discussionmentioning

confidence: 99%

Do voxel size and filter application on CBCT images improve the diagnosis of condylar morphological alterations? An ex vivo study

de Oliveira Reis,

Santos‐Corvini,

Gaêta‐Araujo

et al. 2023

J of Oral Rehabilitation

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“…According to the relevant literature, the application of enhancement filters on CBCT exams yields varying results. 15 16 19 20 Their use was shown not to enhance the visualization of endodontic complications, such as fractured files, perforations, or deviated posts, and only slightly improved the detection of external root resorption. 16 19 The present findings diverge from these outcomes, which may be attributed to differences in the diagnostic tasks assessed, the CBCT devices utilized, and the filters tested, as the abovementioned studies used enhancement filters within XoranCat software (Xoran Technologies, Ann Arbor, MI, USA).…”

Section: Discussionmentioning

confidence: 99%

“…Mouzinho-Machado et al 20 investigated the effect of the same enhancement filters examined in this study on the detection of the second mesiobuccal canal in teeth filled with gutta-percha, finding that their use did not influence the performance of this diagnostic task. Furthermore, Gonzalez et al 15 observed that applying a sharpening filter to CBCT exams conducted with low-dose protocols (e.g., low mA values) improved the diagnosis of root fractures in teeth filled with gutta-percha. Given that metallic posts and gutta-percha can create artifacts that compromise the quality of CBCT exams, the finding that sharpening filters can enhance the visualization of VRF is key.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, most CBCT software includes digital enhancement filters, such as sharpening filters, which modify the gray values of the image after reconstruction. 15 These enhancement filters have been found to be beneficial for diagnostic tasks, including the visualization of root resorptions. 16 While MAR and enhancement filters function differently, both tools can improve the visualization of CBCT images without the need to increase energy parameters, aligning with the principles of radioprotection.…”

Section: Introductionmentioning

confidence: 99%

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Vertical root fracture diagnosis in teeth with metallic posts: Impact of metal artifact reduction and sharpening filters

Ruiz,

Rosado,

Fontenele

et al. 2024

Imaging Sci Dent

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Purpose This study examined the influence of a metal artifact reduction (MAR) tool, sharpening filters, and their combination on the diagnosis of vertical root fracture (VRF) in teeth with metallic posts using cone-beam computed tomography (CBCT). Materials and Methods Twenty single-rooted human premolars - 9 with VRF and 11 without - were individually placed in a human mandible. A metallic post composed of a cobalt-chromium alloy was inserted into the root canal of each tooth. CBCT scans were then acquired under the following parameters: 8 mA, a 5×5 cm field of view, a voxel size of 0.085 mm, 90 kVp, and with MAR either enabled or disabled. Five oral and maxillofacial radiologists independently evaluated the CBCT exams under each MAR mode and across 3 sharpening filter conditions: no filter, Sharpen 1×, and Sharpen 2×. The diagnostic performance was quantified by the area under the receiver operating characteristic curve (AUC), sensitivity, and specificity. These metrics were compared using 2-way analysis of variance with a significance level of α=5%. Intra- and inter-examiner agreement were assessed using the weighted kappa test. Results Neither MAR nor the application of sharpening filters significantly impacted AUC or specificity ( P >0.05). However, sensitivity increased when MAR was combined with Sharpen 1× and Sharpen 2× ( P =0.015). The intra-examiner agreement ranged from fair to substantial (0.34-0.66), while the inter-examiner agreement ranged from fair to moderate (0.27-0.41). Conclusion MAR in conjunction with sharpening filters improved VRF detection; therefore, their combined use is recommended in cases of suspected VRF.

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Principles of Cone Beam Computed Tomography

Scarfe¹

2023

3D Imaging in Endodontics

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Influence of sharpening filters on the detection of root fractures using low-dose cone-beam computed tomography

Cited by 6 publications

References 31 publications

Do voxel size and filter application on CBCT images improve the diagnosis of condylar morphological alterations? An ex vivo study

Do voxel size and filter application on CBCT images improve the diagnosis of condylar morphological alterations? An ex vivo study

Vertical root fracture diagnosis in teeth with metallic posts: Impact of metal artifact reduction and sharpening filters

Principles of Cone Beam Computed Tomography

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