Influence of voxel size on cone beam computed tomography artifacts arising from the exomass

Candemil, Amanda Pelegrin; Salmon, Benjamin; Ambrosano, Gláucia María Bovi; Freitas, Deborah Queiroz; Haiter-Neto, Francisco; Oliveira, Matheus Lima

doi:10.1016/j.oooo.2020.12.003

Cited by 8 publications

(15 citation statements)

References 17 publications

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“…Such a controversy in the results of different CBCT scanners is probably due to some small variations in exposure parameters such as amperage (mAs). Also, it may indicate that the artifacts generated by objects with different linear attenuation coefficients are not expressed similarly by different CBCT scanners [21].…”

Section: Discussionmentioning

confidence: 99%

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Effect of the Field of View Size on CBCT Artifacts Caused by the Presence of Metal Objects in the Exomass

Safi

Ahsaie

Amiri

2022

International Journal of Dentistry

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Background and Aim. This study aimed to assess the effect of the size of the field of view (FOV) on cone-beam computed tomography (CBCT) artifacts caused by metal objects in the exomass. Materials and Methods. In this in vitro experimental study, titanium implants, teeth with cobalt-chromium (Co-Cr) intracanal posts, and teeth with mesio-occluso-distal (MOD) amalgam restorations were placed in an empty socket of the extracted third molar of a human mandible. These metallic materials were differently arranged in the exomass (zone outside of the FOV). A polypropylene tube containing dipotassium phosphate was placed in the empty socket of the right canine tooth in a dry human mandible. CBCT scans were taken with a NewTom VGI (Verona, Italy) scanner using a 6 × 6 cm and an 8 × 8 cm FOV. The histogram tool of OnDemand software (Cybermed, Seoul, Korea) was used to select circles with a 1.5 mm diameter as the (ROI) at the center of the homogenous solution of dipotassium phosphate tube on the axial plane. The mean gray value (GV) and its standard deviation (SD) in the region of interest (ROI) were calculated ( P > 0.05 ). The data were analyzed by SPSS 26. Results. The reduction in the size of the FOV significantly decreased the mean GV ( P < 0.001 ). Metal objects in the exomass significantly decreased the mean GV ( P < 0.001 ), and minimum mean GV and maximum SD were recorded for amalgam, followed by Co-Cr intracanal posts, and titanium implants. The unilateral presence of a metal object was associated with a higher mean GV and lower SD ( P < 0.001 ). Conclusion. Using a smaller FOV increases the size of the exomass, which may negatively affect the image quality. Metal objects in the exomass decrease the GV of CBCT scans and adversely affect the image quality.

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Section: Discussionmentioning

confidence: 99%

“…e mean GV was reported to assess the overall lightness/darkness of an image, and the SD value was reported to assess the variability of GVs or nonhomogeneity of the image [21].…”

Section: Cbct Volume Assessmentmentioning

confidence: 99%

Effect of the Field of View Size on CBCT Artifacts Caused by the Presence of Metal Objects in the Exomass

Safi

Ahsaie

Amiri

2022

International Journal of Dentistry

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“…Spatial resolution affects the ability of the image to display fine details of the object of interest 27 . Although voxel size does not equate with spatial resolution directly, each CBCT system has a unique strategy to improve resolution and increase the signal‐to‐noise ratio 27 .…”

Section: Discussionmentioning

confidence: 99%

“…9 Spatial resolution affects the ability of the image to display fine details of the object of interest. 27 Although voxel size does not equate with spatial resolution directly, each CBCT system has a unique strategy to improve resolution and increase the signal-tonoise ratio. 27 In our study, erosion-type morphological alterations were over-diagnosed at larger voxel sizes (higher absolute values of true and false positives).…”

Section: Iskanderani Et Al Compared Images Performed Using a Veraview...mentioning

confidence: 99%

“…27 Although voxel size does not equate with spatial resolution directly, each CBCT system has a unique strategy to improve resolution and increase the signal-tonoise ratio. 27 In our study, erosion-type morphological alterations were over-diagnosed at larger voxel sizes (higher absolute values of true and false positives). This is probably related to lower sharpness generated by the larger voxel size, which may have mimicked The position of the condyle in the articular fossa and the condylar excursion were evaluated by the observers subjectively and objectively, based on the measurements of the articular spaces and the distance from the top of the condyle to the inferior part of the eminence.…”

Section: Iskanderani Et Al Compared Images Performed Using a Veraview...mentioning

confidence: 99%

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Do cone‐beam computed tomography low‐dose protocols affect the evaluation of the temporomandibular joint?

Reis

Gaêta‐Araujo

Rosado

et al. 2022

J of Oral Rehabilitation

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Background: There is no established acquisition protocol based on scientific evidence for the acquisition of cone-beam computed tomography (CBCT) exams to evaluate the temporomandibular joint (TMJ). Objectives:To evaluate the influence of acquisition protocols and jaw positioning on the diagnostic accuracy of TMJ condylar morphological alterations (CMA), dimension, position and excursion.Methods: Thirty-six TMJs on 18 dry skulls were imaged using a CBCT unit (OP300 Maxio, Instrumentarium, Tuusula, Finland) at two exposure settings (4.5 and 6.3 mA), three voxel resolutions (0.085, 0.125 and 0.280 mm), three jaw positions (concentric, anteriorised and posteriorised) and three jaw excursions (normoexcursion, hyperexcursion and hypoexcursion). The macroscopic anatomy examination and highresolution CBCT images were used as ground truth for CMA. Twenty-five TMJs had at least one CMA with 11 healthy TMJs serving as controls. Three experienced oral and maxillofacial radiologists evaluated the parasagittal images for the presence of CMA, position and excursion and measured dimensions. The area under the ROC curve, sensitivity and specificity were calculated. Weighted Kappa (α = 0.05) was used to determine intra-and interexaminer reliability and comparisons between dependent variables analysed by Analysis of Variance at an a prior level of significance of 0.05. Results:The agreement of the evaluation of the position and excursion with the reference standard was high, independent of the protocol (range, 0.75-0.91). Various combinations of acquisition protocols and jaw position did not influence the CMA evaluation. Erosion was overdiagnosed in protocols with larger voxel sizes and the detection of osteophytes greater in images with smaller voxel sizes. The anteroposterior dimension was greater in the open jaw position (p < .05). Conclusion:CBCT protocols using reduced radiation exposure from the CBCT machine evaluated in this study can be used to assess condylar morphology, dimension, position and excursion, without compromising diagnostic performances for these parameters.

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Evaluation of Cone-beam Computed Tomography Artifacts Produced by Metal Objects Located Within and Outside the Field of View

Kassabji¹,

Tahmasbi²,

Augsburger³

et al. 2022

Journal of Endodontics

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Influence of voxel size on cone beam computed tomography artifacts arising from the exomass

Cited by 8 publications

References 17 publications

Effect of the Field of View Size on CBCT Artifacts Caused by the Presence of Metal Objects in the Exomass

Effect of the Field of View Size on CBCT Artifacts Caused by the Presence of Metal Objects in the Exomass

Do cone‐beam computed tomography low‐dose protocols affect the evaluation of the temporomandibular joint?

Evaluation of Cone-beam Computed Tomography Artifacts Produced by Metal Objects Located Within and Outside the Field of View

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