Image artifact in dental cone-beam CT

Katsumata, Akitoshi; Hirukawa, Akiko; Noujeim, Marcel; Okumura, Shuzo; Naitoh, Munetaka; Fujishita, Masami; Ariji, Eiichiro; Langlais, Robert P.

doi:10.1016/j.tripleo.2005.07.027

Cited by 140 publications

(63 citation statements)

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“…A TCFC é uma técnica de TC que, apesar de apresentar uma menor resolução da imagem em relação à TCMS (Cavalcanti 2008;Draenert et al, 2007;Katsumata et al, 2006;, também promove mensurações precisas e com alta acurácia. Quando comparada à TCMS, a TCFC tem menor custo e produz menor quantidade de radiação, o que levou à sua adoção no planejamento na colocação de implantes dentários (Baba et al, 2004;Cavalcanti 2008;Ganz 2005;Kobayashi 2004, Palomo et al, 2008.…”

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“…. Embora exista evidência de que ambas as técnicas sejam precisas e tenham acurácia, a presença de artefatos metálicos dentários ainda parece interferir com a análise das imagens (Draenert et al, 2007;Katsumata et al, 2006;Holberg et al, 2005;Perrella et al, 2010 (Fiala et al, 1993;Fiala et al, 1994;Glover et al, 1981). Na reconstrução das imagens, os artefatos metálicos dentários podem ser observados como áreas hipodensas (beam hardening), circunscritas por áreas hiperdensas (estrias) com mais de 1000 Unidades Hounsfield (UH) (escala de densidade cinza da TC), que podem ser observadas próximo de qualquer tipo de metal, incluindo implantes de titânio e restaurações metálicas (Draenert et al, 2007;Perrella et al, 2010).…”

Section: Introductionunclassified

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Avaliação das medidas lineares do rebordo alveolar previamente à colocação de implantes, na presença de artefatos metálicos dentários, usando a tomografia computadorizada de feixe cônico ou tomografia computadorizada multislice

Cremonini¹

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Section: Introductionunclassified

Avaliação das medidas lineares do rebordo alveolar previamente à colocação de implantes, na presença de artefatos metálicos dentários, usando a tomografia computadorizada de feixe cônico ou tomografia computadorizada multislice

Cremonini¹

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“…There is no image distortion. Since the active detector is square, pyramidal beam is used [12,32,36,[38][39][40].Cone beam computed tomography (CBCT) was originally developed in 1982 for angiography [16,17,36,41]. More than a decade later, it was applied to dentomaxillofacial diagnostics.…”

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confidence: 99%

“…abbreviation is used, the inclusion of computed tomography demands that a radiology specialist must analyse the acquisition, which would represent an additional expenditure. A dentist, oral surgeon, maxillofacial surgeon cannot analyse conventional CT acquisitions [10][11][12]15,17,32,33,35,43,58,[61][62][63][64].There is also a practical reason; DVT is using lower-intensity radiation than conventional CT. Consequently, it makes only the structure of bone density materials visible in details on the acquisition picture but the soft tissue cannot visualized qualitatively [11,37,39,43,65]. In contrast, some cone or pyramidal beam using equipment, scanning with higher intensity X-ray, is able to show the quality of soft tissues (MDCT) [13,14,29,66].…”

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“…If a dental CBCT scan was taken of a patient, the nape was outside of the FOV. It has attenuated the X-ray beam but this mass is outside the field of reconstruction.This mass has caused a change in the grey values in the HU measurement [37,39,47,66,75,76]. Therefore, this artefact did affect the value of the ideal concentration of the applied contrast material solution as well.…”

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Examination of Grey Value Accuracy and Improvement of Image Quality in Cone Beam Computed Tomography (CBCT)

Plachtovics

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The WARM operation mode represents that the CBCT machine was switched on for at least two hours before the scan but no detector calibration was performed. WARM+C WARM+C scan protocol is consistent with the cone beam computed tomography scan with the complete calibration sequence after the warming-up period. The two-hour warming-up period preceded the calibration process. WUP warming-up period 2D 2 dimensional 3D 3 dimensional iv Galen's principal interest was in human anatomy but, from about 150 BC [2], Roman law had prohibited the dissection of human cadavers. Because of this restriction, Galen performed anatomical dissections on living (vivisection) and dead animals, mostly focusing on pigs and primates [3]. This work was useful because the anatomical structures of these animals usually closely mirror those of humans. Galen clarified the anatomy of the trachea, and was the first to demonstrate that the larynx generates the voice [4,5]. In one experiment, Galen used bellows to inflate the lungs of a dead animal. In his work De motu musculorum, Galen explained the difference between motor and sensory nerves, discussed the concept of muscle tone, and explained the difference between agonists and antagonists [5,6].Andreas Vesalius ( This environment, which lasted from the second century (Galenius) to the sixteenth century (Vesalius), developed a strong desire to have the ability to see inside the human body [7]. Development of medical imagingDuring many centuries the only way to visualize the inside of the human body was through dissection. With technical development, scientists had started to investigate the inside of the human body without its opening. In 1881, Alexander Graham Bell attempted to use magnets and sound waves to discover the location of the bullet that eventually killed U.S.President James A. Garfield [8].After a lengthy period, during scientific experiments with various types of vacuum tube equipment, the discovery of X-rays in 1895, by the Bavarian physicist Conrad Röntgen, represented a major breakthrough (Figure 3 A). When X-rays were finally discovered, they found their way to medical applications within months [9]. B C A 3The original discovery by Röntgen, at the Physical Institute, Julius-Maximilian University, Würzburg, Germany, is recorded to be on 8 November 1895 [9][10][11][12][13][14][15][16][17]. During the discovery, he speculated that a new kind of ray might be responsible for the observation.Since 8 th November was a Friday, instead of relaxing over the weekend, Röntgen took advantage of the time to repeat his experiments. In the following weeks he investigated many properties of the new rays he had temporarily termed 'X-ray'. In fact, he virtually lived in his laboratory during that time. The new X-ray is called the 'Röntgen ray' in many languages [18]. Nearly two weeks after his discovery, he took the very first picture using X-rays of his wife Anna Bertha's hand. When she saw her skeleton she exclaimed 'I have seen my death!' (Figure 3 B and C) [10,18]. Röntgen receive the fir...

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Contemporary Concepts of Cone Beam Computed Tomography in Orthodontics

Kapila

2014

Cone Beam Computed Tomography in Orthodontics: Indications, Insights, and Innovations

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Image artifact in dental cone-beam CT

Cited by 140 publications

References 9 publications

Avaliação das medidas lineares do rebordo alveolar previamente à colocação de implantes, na presença de artefatos metálicos dentários, usando a tomografia computadorizada de feixe cônico ou tomografia computadorizada multislice

Avaliação das medidas lineares do rebordo alveolar previamente à colocação de implantes, na presença de artefatos metálicos dentários, usando a tomografia computadorizada de feixe cônico ou tomografia computadorizada multislice

Examination of Grey Value Accuracy and Improvement of Image Quality in Cone Beam Computed Tomography (CBCT)

Contemporary Concepts of Cone Beam Computed Tomography in Orthodontics

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