Magnitude of cone beam CT image artifacts related to zirconium and titanium implants: impact on image quality

Fontenele, Rocharles Cavalcante; Nascimento, Eduarda Helena Leandro; Vasconcelos, Taruska Ventorini; Noujeim, Marcel; Freitas, Deborah Queiroz

doi:10.1259/dmfr.20180021

Cited by 53 publications

(55 citation statements)

References 22 publications

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“…facts to different regions of the CBCT volume. 1,2 Further investigation of this possibility is important for confirming whether errors in the reconstructed data can affect the image quality in regions distant from the artifact-generating material.…”

Section: Magnitude Of Beam-hardening Artifacts Produced By Gutta-percmentioning

confidence: 99%

“…Although the presence of metal posts and gutta-percha is very common in dental examinations, until now, studies investigating the magnitude of the artifacts in CBCT images have only focused on dental implants. 1,2,6,7 As different materials produce artifacts of different magnitude and as endodontic materials typically have a high atomic number, 11 studying how the artifacts relate to these materials throughout the volume of the CBCT scan is relevant. Since the tube current is directly related to the administered radiation dose, it should be set as low as diagnostically acceptable.…”

Section: Magnitude Of Beam-hardening Artifacts Produced By Gutta-percmentioning

confidence: 99%

“…Artifacts impair the image quality of cone-beam computed tomography (CBCT) scans and may hinder the diagnosis of numerous conditions. Among the types of artifacts on CBCT scans, those derived from the beam-hardening effect may critically impact diagnosis and are caused by high-density materials located inside 1,2 or outside 3 the field of view. Such materials include dental restorations and metal crowns, dental implants, gutta-percha, and metal posts.…”

Section: Introductionmentioning

confidence: 99%

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Magnitude of beam-hardening artifacts produced by gutta-percha and metal posts on cone-beam computed tomography with varying tube current

et al. 2020

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Purpose: This study was performed to evaluate the magnitude of artifacts produced by gutta-percha and metal posts on cone-beam computed tomography (CBCT) scans obtained with different tube currents and with or without metal artifact reduction (MAR). Materials and Methods: A tooth was inserted in a dry human mandible socket, and CBCT scans were acquired after root canal instrumentation, root canal filling, and metal post placement with various tube currents with and without MAR activation. The artifact magnitude was assessed by the standard deviation (SD) of gray values and the contrastto-noise ratio (CNR) at the various distances from the tooth. Data were compared using multi-way analysis of variance. Results: At all distances, a current of 4 mA was associated with a higher SD and a lower CNR than 8 mA or 10 mA (P<0.05). For the metal posts without MAR, the artifact magnitude as assessed by SD was greatest at 1.5 cm or less (P<0.05). When MAR was applied, SD values for distances 1.5 cm or closer to the tooth were reduced (P<0.05). MAR usage did not influence the magnitude of artifacts in the control and gutta-percha groups (P>0.05). Conclusion: Increasing the tube current from 4 mA to 8 mA may reduce the magnitude of artifacts from metal posts. The magnitude of artifacts arising from metal posts was significantly higher at distances of 1.5 cm or less than at greater distances. MAR usage improved image quality near the metal post, but had no significant influence farther than 1.5 cm from the tooth.

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Section: Magnitude Of Beam-hardening Artifacts Produced By Gutta-percmentioning

confidence: 99%

Section: Magnitude Of Beam-hardening Artifacts Produced By Gutta-percmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnitude of beam-hardening artifacts produced by gutta-percha and metal posts on cone-beam computed tomography with varying tube current

et al. 2020

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“…To determine the position of the ROIs, lines with different angulations in relation to the dental implant posi-tion and circles with different radii that were centered on the dental implant were established according to previously described methodologies. 9,14 Figure 2 shows the lines and circles distributed around the dental implant according to the angulations and radii used. The 29 ROIs were distributed in 6 regions according to the length of the radius from the implant (region 1, 10 mm; region 2, 15 mm; region 3, 20 mm; region 4, 25 mm; region 5, 30 mm; region 6, 35 mm) ( Fig.…”

Section: Image Analysismentioning

confidence: 99%

Does the metal artifact reduction algorithm activation mode influence the magnitude of artifacts in CBCT images?

et al. 2020

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Purpose: This study was conducted to assess the effectiveness of a metal artifact reduction (MAR) algorithm activated at different times during cone-beam computed tomography (CBCT) acquisition on the magnitude of artifacts generated by a zirconium implant. Materials and Methods: Volumes were obtained with and without a zirconium implant in a human mandible, using the OP300 Maxio unit. Three modes were tested: without MAR, with MAR activated after acquisition, and with MAR activated before acquisition. Artifacts were assessed in terms of the standard deviation (SD) of gray values and the contrast-to-noise ratio (CNR) in 6 regions of interest with different distances (10 to 35 mm, from the nearest to the farthest) and angulations (70° to 135°) from the implant region. Results: In the acquisitions without MAR, the regions closer to the implant (10 and 15 mm) had a higher SD and lower CNR than the farther regions. When MAR was activated (before or after), SD values did not differ among the regions (P>0.05). The region closest to the implant presented a significantly lower CNR in the acquisitions without MAR than when MAR was activated after the acquisition; however, activating MAR before the acquisition did not yield significant differences from either of the other conditions. Conclusion: Both modes of MAR activation were effective in decreasing the magnitude of CBCT artifacts, especially when the effects of the artifacts were more noticeable.

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“…Os resultados obtidos no presente estudo evidenciam que os artefatos de distorção, caracterizados pela super ou subestimação das estruturas avaliadas nas imagens de TCFC, produzidos pela radiação X policromática, são intrínsecos aos processos de escaneamento e reconstrução, e que sua ocorrência pode prejudicar a análise quali-quantitativa, bem como influenciar de forma negativa o processo de diagnóstico clínico em Endodontia (PATEL et al, 2015;VASCONCELOS et al, 2015;ESTRELA et al, 2018;FONTENELE et al, 2018;TANG et al, 2018;VASCONCELOS et al, 2018), uma vez que impossibilitam a delimitação exata da forma original das estruturas avaliadas (SCHULZE et al, 2011;DECURCIO et al, 2012;BRITO et al, 2014;VASCONCELOS et al, 2015;CODARI et al, 2017;GAETA-ARAUJO et al, 2017;VERSIANI et al, 2018). Nesse sentido, pode-se inferir que a sub ou superestimação das estruturas dificultam a interpretação das imagens de TCFC, levando a análises inconclusivas, podendo mascarar ou influenciar o diagnóstico de fraturas e perfurações (NAGARAJAPPA; DWIVEDI; TIWARI, 2015;CODARI et al, 2017;VASCONCELOS et al, 2018;VERSIANI et al, 2018), de variações anatômicas como istmos, canais acessórios e laterais (VIZZOTTO et al, 2013;VASCONCELOS et al, 2015), bem como de sub ou sobreobturação, levando muitas vezes à realização de erros nos planejamentos e protocolos de tratamento (COSTA et al, 2012;HASSAN et al, 2012;MELO et al, 2013;VIZZOTTO et al, 2013;BRITO et al, 2014;NAGARAJAPPA;DWIVEDI;TIWARI, 2015;CODARI et al, 2017;HUANG et al, 2017;VASCONCELOS et al, 2018;VERSIANI et al, 2018).…”

Section: Escaneamento Em Tcfcunclassified

Avaliação da super e subestimação dos parâmetros morfométricos bidimensionais de canais radiculares de molares inferiores em imagens tomográficas utilizando a microtomografia como padrão de referência

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A Deus, que ilumina o meu caminho, me abençoa diariamente com sabedoria e força de vontade! À minha mãe, Marisa Verardino, por todo amor, carinho e dedicação. Pela compreensão durante minhas ausências, e por sempre me apoiar e incentivar. Ao meu pai, José Maurício Paraderlla de Camargo, amigo e minha maior referência, pelos ensinamentos diários, pelo incentivo constante e pelo orgulho que sente por mim que sempre me fortalece. À minha irmã, Maíra Verardino de Camargo, pelo carinho, amor e companhia diária. À minha namorada, Bianca Aparecida Martin, por todo apoio e compreensão. Obrigado por sempre estar ao meu lado sempre com muito amor, carinho e amizade. Agradecimentos Ao meu orientador, Prof. Dr. Manoel Damião de Sousa Neto, exemplo de dedicação, pelos ensinamentos e críticas que me fazem crescer constantemente. Meu reconhecimento e gratidão pela orientação e oportunidades oferecidas que contribuíram para a minha formação intelectual, científica e profissional. Ao Prof. Dr. Jesus Djalma Pécora, pelos conhecimentos enriquecedores, exemplo de pesquisador inventivo e perspicaz. Admiração por sua sabedoria e cultura. Ao Prof. Dr. Ricardo Gariba Silva e Prof. Dr. Antônio Miranda da Cruz Filho pela agradável convivência e pelo constante aprendizado em Endodontia. Aos professores da disciplina de Endodontia, Prof. Dr. Ricardo Novak Savioli e Prof. Dr. Luiz Pascoal Vansan, e à professora da disciplina de Dentística Profa. Dra. Aline Evangelista de Souza Gabriel, pelo agradável convívio e pelos ensinamentos compartilhados. À Profa. Dra. Graziela Bianchi Leoni, pelo tempo e carinho que ofereceu em diferentes etapas deste trabalho. Ao meu amigo Jardel Francisco Mazzi Chaves, pela amizade, pelos conhecimentos compartilhados e apoio desde o início, e que por sua dedicação e critério à pesquisa, me inspira em todos os trabalhos. Obrigado por toda a ajuda e dedicação para a realização desse trabalho. Muito obrigado! Aos meus amigos Thaís Oliveira Alves e Fillipe Mendes Silva, obrigado por estarem sempre presentes, por todas as experiências compartilhadas. Com vocês, superar as dificuldades e a conclusão desse processo foi mais fácil. Obrigado por toda a amizade! Aos amigos da pós-graduação Fretes, pela convivência agradável e pela troca de experiências. A todos os meus amigos da 87ª Turma de Odontologia pela amizade e agradável convívio. A todos os meus familiares e amigos, que sempre me apoiaram, ajudando a vencer mais essa etapa da minha vida. Gratidão! Ao funcionário Carlos Feitosa dos Santos, exemplo de eficiência e dedicação, pelas inúmeras ajudas e apoio. Ao funcionário Reginaldo Santana da Silva, pelo incentivo, disponibilidades e momentos de risadas. Aos funcionários, Débora Fernandes pelo auxílio, e por sempre serem muito solícitos, atenciosos e disponíveis. À CAPES -Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, pelo apoio financeiro durante minha trajetória na pós-graduação À Faculdade de Odontologia de Ribeirão Preto, que desde a graduação me acolheu e, desde então, têm permitido o meu desenvolvimen...

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Magnitude of cone beam CT image artifacts related to zirconium and titanium implants: impact on image quality

Cited by 53 publications

References 22 publications

Magnitude of beam-hardening artifacts produced by gutta-percha and metal posts on cone-beam computed tomography with varying tube current

Magnitude of beam-hardening artifacts produced by gutta-percha and metal posts on cone-beam computed tomography with varying tube current

Does the metal artifact reduction algorithm activation mode influence the magnitude of artifacts in CBCT images?

Avaliação da super e subestimação dos parâmetros morfométricos bidimensionais de canais radiculares de molares inferiores em imagens tomográficas utilizando a microtomografia como padrão de referência

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