Готові списки джерел за темами / Metallic artefact

Добірка наукової літератури з теми "Metallic artefact"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Metallic artefact"

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Tran, Lan Thi Xuan, Junichiro Sakamoto, Ami Kuribayashi, Hiroshi Watanabe, Hiroshi Tomisato, and Tohru Kurabayashi. "Quantitative evaluation of artefact reduction from metallic dental materials in short tau inversion recovery imaging: efficacy of syngo WARP at 3.0 tesla." Dentomaxillofacial Radiology 48, no. 7 (October 2019): 20190036. http://dx.doi.org/10.1259/dmfr.20190036.

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Objectives: To evaluate the effects of syngo WARP on reducing metal artefacts from dental materials. Methods: Short tau inversion recovery (STIR) with syngo WARP [a dedicated metal artefact reduction sequence in combination with view-angle-tilting (VAT)] was performed using phantoms of three dental alloys: cobalt–chromium (Co–Cr), nickel–chromium (Ni–Cr), and titanium (Ti). Artefact volumes and reduction ratios of black, white and overall artefacts in the standard STIR and syngo WARP images with several different parameter settings were quantified according to standards of the American Society for Testing and Materials F2119-07. In all sequences, the artefact volumes and reduction ratios were compared. The modulation transfer function (MTF) and contrast-to-noise ratio (CNR) were also measured for evaluation of image quality. Results: In standard STIR, the overall artefact volume of Co–Cr was markedly larger than those of Ni–Cr and Ti. All types of artefacts tended to be reduced with increasing receiver bandwidth (rBW) and VAT. The effect of artefact reduction tended to be more obvious in the axial plane than in the sagittal plane. Compared with standard STIR, syngo WARP with a matrix of 384 × 384, receiver bandwidth of 620 Hz/pixel, and VAT of 100 % in the axial plane obtained reduction effects of 30 % (white artefacts), 45 % (black artefacts), and 38 % (overall artefacts) although MTF and CNR decreased by 30 and 22 % compared with those of standard STIR, respectively. Conclusions: syngo WARP for STIR can effectively reduce metal artefacts from dental materials.
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2

Mohammed, Mahmud, Norma Ab. Rahman, and Ahmad Hadif Zaidin Samsudin. "The Impact of Different Types of Orthodontic Appliances and Its Location in Producing CT Scan Artefacts." Sains Malaysiana 50, no. 10 (October 31, 2021): 3067–75. http://dx.doi.org/10.17576/jsm-2021-5010-19.

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Fixed orthodontic appliances can produce metal artefacts in CT images which may degrade the diagnostic image quality. The study aimed to evaluate the artefacts based on the types and location of the metallic and non-metallic orthodontic brackets. This is an in-vitro cross-sectional study. Four different types of orthodontic brackets (stainless steel, titanium, monocrystalline, and polycrystalline ceramic bracket) were bonded consecutively in four different locations of the cadaveric skull. All scans were performed by a single operator using the same CT machine followed by a standard scanning protocol. Artefact intensity for all data sets was quantified by calculating the standard deviation (SD) of the grey values within the dataset by following a standard method. The One-way ANOVA Bonferroni test was used for the data analysis. The mean artefact score of the stainless steel bracket was significantly (p < 0.001) high in comparison with other types of the orthodontic brackets. Besides, the mean artefact score was significantly (p=0.002) low when orthodontic brackets were placed unilaterally. Stainless steel brackets produced a significant amount of noise in CT images which can degrade the diagnostic image quality. Thus, the polycrystalline ceramic bracket can be a better alternative of stainless steel brackets for patient need frequent CT scan.
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3

Figueiredo, E., Rui Jorge C. Silva, Francisco Manuel Braz Fernandes, and M. F. Araújo. "Some Long Term Corrosion Patterns in Archaeological Metal Artefacts." Materials Science Forum 636-637 (January 2010): 1030–35. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.1030.

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Long term corrosion phenomena are generally not obtained in laboratorial corrosion experiments. Particular features, such as strong intergranular corrosion, can be an indication of the antiquity of a metallic artefact. In the present study, various corrosion features from several archaeological bronze artefacts, with ages ranging from 2 to 5 millenniums, are examined using optical and scanning electron microscopies. Elemental composition was obtained through micro-EDXRF analyses. Corrosion patterns could, in some occasions, be related to specific thermomechanical treatments performed before burial and, in others, with particular phases present in the artefact.
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Park, Hyoung Suk, Yong Eun Chung, and Jin Keun Seo. "Computed tomographic beam-hardening artefacts: mathematical characterization and analysis." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2043 (June 13, 2015): 20140388. http://dx.doi.org/10.1098/rsta.2014.0388.

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This paper presents a mathematical characterization and analysis of beam-hardening artefacts in X-ray computed tomography (CT). In the field of dental and medical radiography, metal artefact reduction in CT is becoming increasingly important as artificial prostheses and metallic implants become more widespread in ageing populations. Metal artefacts are mainly caused by the beam-hardening of polychromatic X-ray photon beams, which causes mismatch between the actual sinogram data and the data model being the Radon transform of the unknown attenuation distribution in the CT reconstruction algorithm. We investigate the beam-hardening factor through a mathematical analysis of the discrepancy between the data and the Radon transform of the attenuation distribution at a fixed energy level. Separation of cupping artefacts from beam-hardening artefacts allows causes and effects of streaking artefacts to be analysed. Various computer simulations and experiments are performed to support our mathematical analysis.
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Samia-Aly, Emma, and Faye Mellington. "Topical silicone gel mistaken for a retained orbital foreign body on MRI." BMJ Case Reports 15, no. 3 (March 2022): e248103. http://dx.doi.org/10.1136/bcr-2021-248103.

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MRI is now a well-regarded imaging technique, but due to its use of strong magnetic fields, some metallic objects are contraindicated. We present a case of a man in his 40s with thyroid eye disease, who underwent bilateral orbital decompression. Following surgery, he was advised to start scar massage with topical silicone gel (Dermatix). He later underwent an MRI head scan which was halted due to concerns of a retained metallic foreign body. Topical silicone gel is widely used clinically for scar management. Due to its properties, it can cause the appearance of an artefact on MRI and be mistaken for a metallic foreign body. We present the first case to our knowledge of an MRI susceptibility artefact which was attributed to topical silicone gel and describe the diagnostic confusion it caused. We recommend asking patients to wash off any topical silicone gel before having an MRI scan.
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Abernethy, Peter, Neil G. McIntyre, Alexander Sanchez-Cabello, Ross Kruger, and Dushyant Shetty. "Localising ingested metallic foreign bodies to guide surgical planning: A novel use for the CT metal artefact reduction algorithm." BJR|case reports 7, no. 5 (September 2021): 20200189. http://dx.doi.org/10.1259/bjrcr.20200189.

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We present the case of a 20-year-old female patient who presented following ingestion of multiple button magnets. She remained clinically well however serial abdominal radiographs demonstrated the magnets were not passing through the gastrointestinal tract and a CT was, therefore, performed for further assessment and to aid surgical planning. Artefact from the magnets made interpretation of the CT challenging. The use of a Metal Artefact Reduction (MAR) algorithm, however, enabled accurate localisation of the magnets thus guiding subsequent surgical intervention. Whilst MAR algorithms are usually used in the assessment of iatrogenic metallic devices (e.g., joint prostheses), this case demonstrates an example of their potential wider use.
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Meinhardt, Christoph, Reinhard Noll, and Cord Fricke-Begemann. "Crosstalk effects of the surface layers of metallic samples on laser-induced breakdown spectroscopy measurements." Journal of Analytical Atomic Spectrometry 36, no. 4 (2021): 796–802. http://dx.doi.org/10.1039/d0ja00445f.

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Material ablation driven by focused laser pulses is an important aspect of laser-induced breakdown spectroscopy (LIBS). Schematics of the studied measuring object as model artefact for non-representative surface layers.
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Kidoh, M., T. Nakaura, S. Nakamura, S. Tokuyasu, H. Osakabe, K. Harada, and Y. Yamashita. "Reduction of dental metallic artefacts in CT: Value of a newly developed algorithm for metal artefact reduction (O-MAR)." Clinical Radiology 69, no. 1 (January 2014): e11-e16. http://dx.doi.org/10.1016/j.crad.2013.08.008.

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Espiritu, Jonathan, Mostafa Berangi, Christina Yiannakou, Eduarda Silva, Roberto Francischello, Andre Kuehne, Thoralf Niendorf, Sören Könneker, Regine Willumeit-Römer, and Jan-Marten Seitz. "Evaluating metallic artefact of biodegradable magnesium-based implants in magnetic resonance imaging." Bioactive Materials 15 (September 2022): 382–91. http://dx.doi.org/10.1016/j.bioactmat.2021.11.035.

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Yener, K. Aslıhan. "The Anatolian Middle Bronze Age kingdoms and Alalakh: Mukish, Kanesh and trade." Anatolian Studies 57 (December 2007): 151–60. http://dx.doi.org/10.1017/s0066154600008577.

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Анотація:
AbstractThe comparisons at the heart of this article concern the varying roles of cuneiform texts, instrumental analysis and artefacts at the Bronze Age capital of Alalakh, located in the northeastern Mediterranean region of southern Turkey. The production of fine artefacts, such as sophisticated metallurgy, glass, faience, ivory carving and, especially, bronze, was under palace patronage, while trade and the networks of inter-regional relations facilitated the transport of materials across great distances in the ancient Near East. Several lines of evidence suggest that exchange relationships between Alalakh and the Middle Bronze Age central Anatolian kingdoms, such as Kanesh, were established prior to the arrival of Hattusili I. One category of artefact, ivory and bone with metallic embellishments, is emphasised here since the crafting of ivory and bone entails the use of local resources, while the plating with precious metals reflects artistic expression and exploitation that is international in scope. Several analytical techniques are presented, such as lead isotope ratios, scanning electron microscopy and polarizing light microscopy, which have aided in defining the artistic expression of Alalakh and the production of artefacts of power and prestige.
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Дисертації з теми "Metallic artefact"

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Grayburn, Rosie. "Spectroelectrochemical techniques for the conservation of metallic artefacts." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/69998/.

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The research presented in this thesis uses laboratory and synchrotron based structural techniques in combination with electrochemistry to test the durability of selected conservation methods. A new piece of portable spectroelectrochemical equipment (the peCell) is also described: the peCell was designed for the long-term monitoring of conservation treatments. Lead carboxylates were selected as the focal point of this research due to the interest in studying their deposition from ethanolic solution and the effectiveness of this type of coating on lead. Therefore the spectroscopic analysis, electrochemical testing in an electrolyte modelling atmospheric corrosion, short-term and longterm volatile organic compound (VOC) exposure, and museum testing of this inhibitor demonstrates an entire package of tests which might be used as a benchmark for testing conservation treatments prior to use on artefacts. In addition the contrasting effects of lead carboxylates in oil paintings and as conservation coatings are discussed. Alongside laboratory spectroelectrochemical data, the corrosion by oak VOCs of a conserved lead sample was studied, (a) using a state-of-the-art in situ timelapse technique on a synchrotron and (b) within a museum environment. Surface analysis by X-ray diffraction (XRD) was used to compare the growth of crystalline surface corrosion products over time: the extent of corrosion can be related to the effectiveness of the various conservation techniques. The peCell is a portable electrochemical or environmental cell which was invented in order to provide a way of tracking the chemical changes occurring in a conserved sample in situ over a long period of time. The cell is capable of holding three samples which can be monitored continuously using open circuit potential and sporadically (i.e. whenever a synchrotron beam line is accessible) using SR-XRD. Other environmental parameters within the cell can also be monitored, such as temperature. The prototype cell was successfully trialled at the XMaS beamline, ESRF using an alternative copper corrosion system.
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2

Blahová, Lucie. "Příprava a charakterizace tenkých bariérových vrstev." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-382714.

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Combinations of different acrylic resins and microcrystalline waxes are most often used for the conservation and preservation of metallic archaeological artefacts these days. However, their properties are not sufficient and satisfactory in many ways. Therefore, the aim of this doctoral thesis is to develop a conservation system which will draw on the new knowledge gained in the field of advanced materials and technologies during last years. A conservation coating based on a thin barrier film appears the most promising. The conservation coating must fulfil particularly following rather contradictory requirements: good barrier function against oxygen, humidity and other corrosive agents; transparency because of colour appearance preservation; long term stability and easy removability; possibility to apply to more objects at the same time and reasonable financial requirements of a deposition process. Parylene C polymer was chosen as suitable material for this purpose. It was prepared via modified chemical vapour deposition. Parylene removability was ensured through the soluble interlayer made of Laksil silicone-acrylic lacquer which was applied between the protected metallic object and the parylene thin film. Initially, the deposition process of Laksil/parylene bilayer was optimized, then its physical and chemical characteristics were determined and eventually, they were compared with the conventional conservation coating composed of Paraloid B72 acrylic resin and Revax microcrystalline wax. Regarding to the demands of the conservation coating, we were interested especially in barrier properties, optical properties, surface morphology and removability of Laksil/parylene bilayer. The most useful method for description of coating barrier properties was corrosion testing in which coated metallic samples were exposed to highly corrosive environment of salt spray (made of 50 g•l–1 brine), 100% humidity and temperature of 35 °C (ISO 9227). The Laksil/parylene bilayer showed excellent barrier properties; samples treated this way sustained unchanged in the corrosion chamber for almost three months. The surface roughness measured by profilometry and surface morphology scanned by SEM illustrated the synergy between Laksil and parylene layer which leads to the exceptional barrier and anticorrosion function of bilayer. The Laksil layer is able to flatten out rough surface of a substrate. Furthermore, it can toughen the item surface which is, in case of a number of archaeological findings, created by corrosion product layers with variable mechanical strength. Thereon deposited parylene film becomes smooth and defect free and can act as a good diffusion barrier. The colouristic measurements confirmed that the Laksil/parylene bilayer does not almost change the appearance of protected item, in terms of colour. The caused colour difference (ISO 11664-4) ranged around 1 which value is defined as “perceivable only for experienced observers”. The Laksil/parylene bilayer is removable thanks to the Laksil solubility in xylene. It is necessary to carefully scratch the outer parylene film to enable access of xylene solvent to the lacquer. The successful removal of Laksil/parylene bilayer was first confirmed by the EDX on metallic iron samples. Afterwards, the possibility of bilayer complete removal even from a corroded surface of the original artefact was proved by TGA. Thus the conservation treatment can be considered fully reversible.
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3

Duque, Maria Isabel Guevara. "Between metals and treads: an archaeometric approach to metallic artefacts from yaguachi chiefdom burials (Guayas Basin, Ecuador)." Master's thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/27738.

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ABSTRACT: The Yaguachi chiefdom was one of the largest groups in the region prior and during Spanish contact. The Yaguachi polity was part of the Milagro-Quevedo archaeological culture, who occupied the entire Guayas Basin in the central and southwestern Ecuador between Guayaquil and the Andes during the Integration (800-1400 CE) and early Hispanic Period. This was a highly organized society with a complex political and social organization, evidence of long distance trade, metal jewelry, mound construction and chimney burials. During excavations on the lower Guayas Basin, the ‘Vuelta Larga’ burial mounds were identified. Some of these burials contained offerings of various types, including local goods like pottery, and foreign ones like metal artefacts, shell beads and obsidian. This research will attempt to determine the metal artefacts’ composition, the relation between artefact’s composition, color and class, possible connection to other sites or cultures of the Andes and the source of the fibers attached to some of the artefacts, through the use non-destructive analytical techniques: stereomicroscopy, X-ray fluorescence spectrometry, scanning electron microscopy and environmental SEM. From these analyses, connections to other sites might be drawn based on artefacts’ metallic composition and manufacturing technique.
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4

Ridolfi, Fabiano. "Efficiente implementazione in CUDA di algoritmi iterativi algebrici per CBCT con integrazione di un nuovo metodo per la rimozione degli artefatti da oggetti densi." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15440/.

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Grazia all'architettura CUDA si possono realizzare delle soluzioni efficienti di algoritmi di ricostruzione iterativi per CBCT. Questi algoritmi consentono la manipolazione dei dati di ricostruzione offrendo la possibilità di integrare direttamente nella fase di creazione del volume dei metodi per migliorare la qualità dell'immagine di output. Vengono proposte l'implementazioni di tre differenti algoritmi iterativi in CUDA e la progettazione di un sistema integrato di riduzione degli artefatti da oggetti densi che elabora e manipola i dati intermedi prodotti durante la ricostruzione.
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Hahn, Matthias. "Verfahren zur Metallartefaktreduktion und Segmentierung in der medizinischen Computertomographie." Karlsruhe : Univ.-Verl. Karlsruhe, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?idn=980335132.

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Santoro, Miriam. "Applicazione della dual energy computed tomography (DECT) per la riduzione degli artefatti metallici nelle protesi d'anca." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19474/.

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Анотація:
Gli artefatti metallici causati dalle protesi d’anca possono degradare notevolmente la qualità delle immagini tomografiche. Il modo in cui queste influiscano sull’immagine dipende dalla loro dimensione, geometria e materiale. Questo lavoro, svolto presso il Laboratorio di Tecnologia Medica dell’Istituto Ortopedico Rizzoli, si focalizza su due obiettivi primari: la realizzazione di un fantoccio che possa contenere al suo interno una protesi d’anca primaria e la valutazione dell’efficacia della Dual-Energy CT e dell’algoritmo Smart MAR combinato con essa nella riduzione degli artefatti metallici nell’imaging delle protesi d’anca. L’obiettivo è quello di valutare quale sia l’impianto protesico che induce meno artefatti e il protocollo di ottimizzazione ideale al variare del materiale. Per quanto riguarda il fantoccio, questo è stato progettato in maniera che potesse contenere qualsiasi geometria, accoppiamento e dimensione della protesi d’anca primaria. Riguardo al secondo obiettivo, dopo aver scansionato il fantoccio simulando diversi casi di impianto monolaterale e un caso di bilaterale, si sono usati due approcci complementari per valutare la severità degli artefatti e la loro riduzione dopo l’applicazione di queste tecniche. Nel primo si sono confrontati numero CT, rumore e SNR di ROI affette da artefatti metallici severi sia per le immagini virtuali monocromatiche che per quelle combinate con Smart MAR. Nel secondo sono stati analizzati i conteggi degli artefatti severi e lievi per le diverse densità che simulano i tessuti attorno alla protesi. Lo studio ha dimostrato che generalmente le sole ricostruzioni monoenergetiche non riducono sufficientemente gli artefatti metallici severi causati da grandi impianti ortopedici. Inoltre, si è visto che il titanio è il materiale che induce meno artefatti severi e che per migliorare la qualità dell’immagine bisognerebbe applicare un protocollo diverso a seconda del materiale protesico.
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Paulino, José Alberto Souza. "Desenvolvimento de uma ferramenta para automatizar redução de artefato metálico em imagens de tomografias computadorizadas." Universidade Estadual da Paraíba, 2017. http://tede.bc.uepb.edu.br/jspui/handle/tede/2859.

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This research proposes to evaluate and implement a solution for metal artifact reduc- tion in computed tomography, this one aiming to meet a demand from the prototyping laboratory of the Núcleo de Tecnologias Estratégicas em Saúde (Nutes) da Univer- sidade Estadual da Paraíba, where impressions of biomodels are made for surgical planning. The CT affected by metal artifacts need to be corrected prior to the printing process, this manual intervention implies excessive delay for delivery of the biomodels. The development of the proposed solution is based on the sinogram correction method which according to Mouton et al (2013) and Gjesteby (2016) is the most utilized method for reducing metal artifacts and makes uses of linear interpolation to correction the cor- rupted data. In order to validate the preference for linear interpolation in the state of the art, others interpolative techniques were implemented and evaluated; Fist through simulations and then by a form for qualitative evaluation, upon which statistical tests were applied. The results obtained confirm the use of interpolation as the best option for the reconstruction of data corrupted by metallic artifacts.
Esta pesquisa se propõe a avaliar e implementar uma solução para redução de artefatos metálicos em tomografias computadorizadas, solução esta que visa atender uma demanda do laboratório de prototipagem do Núcleo de Tecnologias Estratégicas em Saúde (Nutes) da Universidade Estadual da Paraíba, onde são realizadas impressões de biomodelos para planejamentos cirúrgicos. As tomografias afetadas por artefatos metálicos necessitam de correção antes do processo de impressão, esta intervenção realizada de forma manual implica em demora excessiva para entrega dos biomodelos. O desenvolvimento da solução proposta baseia-se no método de correção de sinograma que, de acordo com Mouton et al (2013) e Gjesteby (2016), é o método mais difundido para redução de artefatos metálicos e faz uso da técnica de interpolação linear para correção dos dados corrompidos. Objetivando validar a preferência pelo uso da interpolação linear no estado da arte, foram implementadas outras técnicas interpolativas as quais foram submetidas a avaliação; Primeiro por meio de simulações e depois via fomulário para avaliação qualitativa, na qual foram aplicados testes estatísticos. Os resultados obtidos ratificam o uso da interpolação linear como melhor opção para reconstrução de dados corrompidos pelos artefatos metálicos.
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Oliveira, Sibele Pereira de. ""Avaliação de lesões malignas dos maxilares na presença de artefatos dentários metálicos utilizando a tomografia computadorizada"." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/23/23139/tde-20012005-142718/.

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Анотація:
O exame de tomografia computadorizada é um grande aliado na elaboração do diagnóstico, planejamento do tratamento e proservação de lesões malignas do complexo maxilomandibular. Em muitos casos é considerado o exame de eleição para estes fins. Um dos problemas que ocorrem com a TC, é o aparecimento de artefatos devido a restaurações metálicas, implantes osseointegrados ou dispositivos metálicos de fixação óssea. Estes artefatos atrapalham a interpretação das imagens, dificultando a visualização de lesões. O propósito deste estudo foi avaliar imagens de TC com seções de cortes axiais e coronais e determinar se o tipo de seção pode minimizar o problema dos artefatos metálicos dentários. Para isto, dois avaliadores calibrados analisaram 72 imagens (36 em cortes axiais e 36 em cortes coronais) e graduaram quais imagens eram mais bem interpretadas. Os resultados não mostraram diferenças significantes entre os cortes axiais e coronais para se chegar ao diagnóstico, na presença de artefatos metálicos na imagem, assim como demonstrou boa concordância entre os observadores. Conclui-se que a presença dos artefatos metálicos dentários não foi considerada suficiente para impedir a localização de neoplasias de tecido mole. Não foi detectada uma interferência maior de artefatos dentários metálicos tanto nas imagens axiais como nas coronais com relação à interpretação das lesões. A imagem coronal apresentou uma maior interferência em comparação com a imagem axial. Palavras-chave: tomografia computadorizada, artefatos metálicos, neoplasias malignas dos maxilares.
Computed tomography is an important tool to determinate the diagnosis, treatment and follow up malignant lesions of the maxillomandibular complex. In many cases, it is the election exam to all of these purposes. One problem with CT is the artifacts that appear in the presence of metallic restorations, implants and metallic fixation screws or plates. These artifacts lead to misinterpretations of the images, making difficult to visualize lesions in these areas. The aim of this research was to evaluate CT images with different sections (axial and coronal) e to determine if the type of section can minimize the problem of dental metallic artifacts. Two calibrate examiners (oral and maxillofacial radiologists) analyzed 72 images (36 in axial slices and 36 in coronal slices) and graduate which images were best viewed. The results attested that there were no significant differences between axial and coronal images to reach the diagnosis in the presence of dental metallic artifacts, and there were a good concordance with both examiners. We conclude that the presence of dental metallic artifacts wasn’t sufficient to disturb the precise location neoplasm of the soft tissue. It wasn’t detected any dental metallic interference possible to misdiagnosis neither on axial images nor on coronal images. Coronal images presented a higher interference when comparing with axial images.
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Cremonini, Caio Cesar. "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." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/23/23146/tde-08052012-160804/.

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Objetivos: O objetivo do estudo foi avaliar a influência de artefatos metálicos dentários em medidas lineares (altura e espessura) realizadas em cortes seccionais parassagitais do rebordo alveolar, na região do forame mentual, utilizando-se duas técnicas de tomografia computadorizada: tomografia computadorizada multislice (TCMS), e tomografia computadorizada de feixe cônico (TCFC). Materiais e Métodos: Dez mandíbulas humanas secas foram selecionadas e escaneadas em dois momentos por cada técnica de tomografia computadorizada, sendo um deles na presença e o segundo na ausência de artefatos metálicos dentários. No segundo escaneamento, restaurações metálicas foram colocadas no topo da crista óssea alveolar, numa posição coronária e adjacente à região do forame mentual, para simular a presença dos artefatos. Imagens de cortes parassagitais foram obtidas e medidas lineares (altura e espessura) foram realizadas no rebordo alveolar na região do forame mentual por um único observador previamente treinado e calibrado, por meio do software Imaging Studio ®, e esse também realizou a análise descritiva se a presença dos artefatos interferiu ou não na identificação de estruturas anatômicas. Todas as mandíbulas foram analisadas na região do forame mentual dos lados direito e esquerdo. Resultados: Para a TCMS, a presença do artefato metálico aumentou a espessura óssea em 5% e houve uma redução de 6% na altura óssea, entretanto, diferenças em relação à altura e espessura óssea não foram estatisticamente significativas (p>0,05).. Para a TCFC, a presença dos artefatos metálicos produziu um aumento de 6% na espessura óssea e uma redução de 0,68% na altura óssea. Não houve diferenças significantes (p>0,05) ao comparar medidas lineares com e sem artefatos metálicos dentários. Nas imagens com artefatos metálicos, houve uma perda de continuidade da crista óssea alveolar para ambas as técnicas. Conclusão: A presença de artefatos metálicos dentários não alterou as medidas lineares em ambas as técnicas, embora a presença dos artefatos tenha dificultado a localização da crista óssea alveolar.
Objective: The objective was to evaluate the influence of dental metallic artefacts on linear measurements (height and thickness) performed in parassagital sections at the alveolar ridge at the mentual foramen region using multislice and cone-beam computed tomography techniques. Materials and Methods: Ten dried human mandibles were scanned twice by each technique, with and without dental metallic artefacts. Metallic restorations were placed at the top of the alveolar ridge, adjacent and coronary to the mental foramen region for the second scanning, in order to simulate dental metallic artefacts. Parassagital images were obtained and linear measurements were performed using the Imaging Studio ® software, by a single examiner previously trained and calibrated. The observer also analyzed if the presence of the artefacts could jeopardize the identification of anatomic structures at the image. All mandibles were analyzed at both the right and the left mental foramen regions. Results: For the multislice technique, dental metallic artefacts produced an increase of 5% in bone thickness and a reduction of 6% in bone height, although these differences were not statistically significant (p > 0.05). With respect to the cone-beam technique, dental metallic artefacts produced an increase of 6% in bone thickness and a reduction of 0.68% in bone height. No significant differences (p > 0.05) were observed when comparing measurements performed with and without metallic artefacts. At the images with artefacts, the alveolar bone identification was jeopardized at both techniques. Conclusion: the presence of dental metallic artefacts did not alter the linear measurements obtained with both techniques, although its presence made the location of the alveolar bone crest more difficult.
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Cremonini, Caio Cesar. "Influência de artefatos metálicos produzidos pela presença de implantes de titânio na análise das cristas ósseas periodontais adjacentes, em tomografia computadorizada de feixe cônico." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/23/23146/tde-21092015-163641/.

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Анотація:
Objetivo: Avaliação da influência de artefatos metálicos nas imagens de tomografia computadorizada de feixe cônico (TCFC), causados por implantes dentários, nas estruturas periodontais dos dentes adjacentes a esse implante. Materiais e Métodos: 23 pacientes foram submetidos ao exame de TCFC antes e após a colocação do implante dentário. Foram realizadas medidas da espessura das corticais vestibulares (CV) por um observador calibrado (ICC=0,95), nos cortes parassagitais de imagens previamente obtidas. Foi calculada a frequência de graus de influência do artefato metálico causado pelo implante (leve, moderado e severo) para distância horizontal ao implante, espessura da CV, e distância vertical em relação à crista óssea vestibular (COV). Resultados: excluídos 5 pacientes, em 18 selecionados, examinou-se 24 implantes unitários na região posterior de mandíbula, sendo 24 dentes teste mesiais (DTM) e 17 dentes teste distais (DTD) a esses implantes. Houve associação entre distância vertical da COV e impossibilidade de se mensurar a espessura da CV para o DTM e DTD (p<0,05 para ambos). Não houve associação entre espessura da cortical vestibular e distância horizontal para a severidade de influência de artefatos (p>0,05 para ambos). Houve associação entre distância horizontal e nível de influência de artefatos em quaisquer estruturas periodontais adjacentes ao implante, para DTM e DTD somados (p<0,05). Conclusão: Os artefatos metálicos causados por implantes dentários podem influenciar a interpretação da imagem de TCFC em sítios periodontais adjacentes, e o grau de influência depende da distância horizontal do implante dentário a quaisquer estruturas periodontais, e quanto mais próximo da COV, maior influência do artefato na identificação e mensuração de estruturas na CV.
Objective: The objective of this study was to evaluate the influence of metallic artifacts in CBCT (Cone beam computed tomography) images, caused by dental titanium implants, at adjacent periodontal structures. Materials and Methods: 23 patients were submitted a CBCT examination before and after the implant placement. Thickness Measurements of buccal cortical were performed by a calibrated observer (ICC=0.95), at parassagital cross-sections of previously obtained images. The frequency of influence level (mild, moderate, severe) of the artifact was calculated for horizontal distance of the implant, buccal cortical thickness and vertical distance of the buccal alveolar crest. Results: 5 patients were excluded, and 18 selected, 24 unitary implants cases at posterior mandible were examined, 24 mesial test teeth (MTT) and 17 Distal test teeth (DTT) from the implants. There was an association between the vertical distance of the buccal alveolar crest and the impossibility to measure the thickness of buccal cortical for MTT and DTT (p<0.05 for both). There was no association between the thickness of buccal cortical and horizontal distance for the artifacts level of influence (p>0.05 for both). There was association between horizontal distance and the level of the artifact influence at any periodontal structure, for the sum of MTT and DTT (p<0.05). Conclusion: the metallic artifacts caused by dental implants can influence the CBCT image interpretation at periodontal adjacent sites, and the level of the influence depends on the horizontal distance of the dental implant at any periodontal structures, and the vertical distance from the buccal alveolar crest.
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Книги з теми "Metallic artefact"

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Scott, David A. Ancient metallic artefacts: Metallography and microstructure. 3rd ed. Washington: Conservation Analytical Laboratory, Smithsonian Institution, 1986.

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(Firm), Knovel, ed. Corrosion of metallic heritage artefacts: Investigation, conservation and prediction of long term behaviour. Boca Raton, Fla: CRC Press, 2007.

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Dillmann, P., P. Piccardo, H. Matthiesen, and G. Béranger, eds. Corrosion of Metallic Heritage Artefacts. CRC Press, 2007. http://dx.doi.org/10.1201/9781439824054.

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Dillmann, P., G. Béranger, P. Piccardo, and H. Matthiesen. Corrosion of metallic heritage artefacts. Woodhead Publishing Limited, 2007. http://dx.doi.org/10.1533/9781845693015.

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Dillmann, P., D. Watkinson, E. Angelini, and A. Adriaens. Corrosion and conservation of cultural heritage metallic artefacts. Woodhead Publishing Limited, 2013. http://dx.doi.org/10.1533/9781782421573.

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Corrosion and Conservation of Cultural Heritage Metallic Artefacts. Woodhead Publishing, 2018.

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Dillmann, P., D. Watkinson, E. Angelini, and A. Adriaens. Corrosion and Conservation of Cultural Heritage Metallic Artefacts. Elsevier Science & Technology, 2013.

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Corrosion And Conservation Of Cultural Heritage Metallic Artefacts. Woodhead Publishing Ltd, 2013.

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Piccardo, P., G. Beranger, P. Dillmann, and H. Matthiessen. Corrosion of Metallic Heritage Artefacts: Investigation, Conservation and Prediction of Long Term Behaviour. Elsevier Science & Technology, 2007.

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Dillman, P. Corrosion of metallic heritage artefacts: Investigation, conservation and prediction of long term behavior (EFC 48) (European Federation of Corrosion Publications). CRC, 2007.

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Частини книг з теми "Metallic artefact"

1

Maréchal, F., and E. Rocca. "Corrosion inhibitors for metallic artefacts." In Corrosion of Metallic Heritage Artefacts. CRC Press, 2007. http://dx.doi.org/10.1201/9781439824054.ch18.

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"Copyright." In Corrosion of Metallic Heritage Artefacts, iv. Elsevier, 2007. http://dx.doi.org/10.1016/b978-1-84569-239-1.50022-9.

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Dillmann, Philippe, Gérard Béranger, Paolo Piccardo, Henning Matthiesen, Christian Degrigny, G. Santarini, Régis Bertholon, et al. "Contributor contact details." In Corrosion of Metallic Heritage Artefacts, xiii—xvii. Elsevier, 2007. http://dx.doi.org/10.1016/b978-1-84569-239-1.50023-0.

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McIntyre, P., B. A. Rickinson, J. P. Berge, and G. Kreysa. "European Federation of Corrosion (EFC) publications: Series introduction." In Corrosion of Metallic Heritage Artefacts, xix—xx. Elsevier, 2007. http://dx.doi.org/10.1016/b978-1-84569-239-1.50024-2.

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"Volumes in the EFC series." In Corrosion of Metallic Heritage Artefacts, xxi—xxv. Elsevier, 2007. http://dx.doi.org/10.1016/b978-1-84569-239-1.50025-4.

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Pourbaix, Antoine. "Foreword." In Corrosion of Metallic Heritage Artefacts, xxvii—xxviii. Elsevier, 2007. http://dx.doi.org/10.1016/b978-1-84569-239-1.50026-6.

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Féron, Damien. "Preface." In Corrosion of Metallic Heritage Artefacts, xxix—xxx. Elsevier, 2007. http://dx.doi.org/10.1016/b978-1-84569-239-1.50027-8.

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Degrigny, C. "Examination and conservation of historical and archaeological metal artefacts." In Corrosion of Metallic Heritage Artefacts. CRC Press, 2007. http://dx.doi.org/10.1201/9781439824054.ch1.

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Mirambet, F., J. Susini, and S. Réguer. "Contribution of local and structural characterisation for studies of the corrosion mechanisms related to the presence of chlorine on archaeological ferrous artefacts." In Corrosion of Metallic Heritage Artefacts. CRC Press, 2007. http://dx.doi.org/10.1201/9781439824054.ch10.

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Loeper-Attia, M. "A proposal to describe reactivated corrosion of archaeological iron objects." In Corrosion of Metallic Heritage Artefacts. CRC Press, 2007. http://dx.doi.org/10.1201/9781439824054.ch11.

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Тези доповідей конференцій з теми "Metallic artefact"

1

Arhatari, Benedicta D., and Brian Abbey. "Ross filter pairs for metal artefact reduction in x-ray tomography: a case study based on imaging and segmentation of metallic implants." In SPIE Nanophotonics Australasia 2017, edited by James W. M. Chon and Baohua Jia. SPIE, 2018. http://dx.doi.org/10.1117/12.2282937.

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Prochazka, M., V. Sazavska, R. Prikryl, R. Balastikova, P. Fojtikova, and F. Krcma. "Plasma treatment of metallic artefacts." In 2012 IEEE 39th International Conference on Plasma Sciences (ICOPS). IEEE, 2012. http://dx.doi.org/10.1109/plasma.2012.6383883.

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Pätzholz, S., C. Heute, F. Strodka, and V. Nicolas. "Nutzen der iterativen Metall-Artefakt-Reduktion (iMAR, Siemens) bei dorsalen Spondylodesen in Abhängigkeit des verwendeten Algorithmus und Kernels." In 100. Deutscher Röntgenkongress. Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0037-1682152.

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Busch, A., A. Wegner, M. Jäger, S. Beck, J. Theysohn, and J. Haubold. "Metall Artefakt Reduzierte Sequenzen (MARS) in der Magnet Resonanz Tomographie (MRT) nach Hüft-TEP. Ein nicht invasives Verfahren zur Differenzierung von aseptischen Prozessen und Periprothetischen Infektionen (PPI)?" In Deutscher Kongress für Orthopädie und Unfallchirurgie. Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1717366.

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