Evaluation of soft tissues simulant materials in cone beam computed tomography

Lopes, Priscila Azeredo; Santaella, Gustavo Machado; Lima, C.A.S.; Vasconcelos, Karla de Faria; Groppo, Francisco Carlos

doi:10.1259/dmfr.20180072

Cited by 18 publications

(20 citation statements)

References 22 publications

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“…A partially dentate human skull embedded in wax to simulate soft-tissues 12 was used in this study. Three regions-of-interest were selected in this skull according to their position in the FOV: anterior maxilla, posterior mandible left and right sides.…”

Section: Experimental Setup and Robot Programmingmentioning

confidence: 99%

Impact of movement and motion-artefact correction on image quality and interpretability in CBCT units with aligned and lateral-offset detectors

Santaella

Wenzel

Haiter-Neto

et al. 2020

Dentomaxillofacial Radiology

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Objectives: To evaluate the impact of movement and motion-artefact correction systems on CBCT image quality and interpretability of simulated diagnostic tasks for aligned and lateral-offset detectors. Methods: A human skull simulating three diagnostic tasks (implant planning in the anterior maxilla, implant planning in the left-side-mandible and mandibular molar furcation assessment in the right-side-mandible) was mounted on a robot performing six movement types. Four CBCT units were used: Cranex 3Dx (CRA), Ortophos SL (ORT), Promax 3D Mid (PRO), and X1. Protocols were tested with aligned (CRA, ORT, PRO, and X1) and lateral-offset (CRA and PRO) detectors and two motion-artefact correction systems (PRO and X1). Movements were performed at one moment-in-time (t1), for units with an aligned detector, and three moments-in-time (t1-first-half of the acquisition, t2-second-half, t3-both) for the units with a lateral-offset detector. 98 volumes were acquired. Images were scored by three observers, blinded to the unit and presence of movement, for motion-related stripe artefacts, overall unsharpness, and interpretability. Fleiss’ κ was used to assess interobserver agreement. Results: Interobserver agreement was substantial for all parameters (0.66–0.68). For aligned detectors, in all diagnostic tasks a motion-artefact correction system influenced image interpretability. For lateral-offset detectors, the interpretability varied according to the unit and moment-in-time, in which the movement was performed. PRO motion-artefact correction system was less effective for the offset detector than its aligned counterpart. Conclusion: Motion-artefact correction systems enhanced image quality and interpretability for units with aligned detectors but were less effective for those with lateral-offset detectors.

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Section: Experimental Setup and Robot Programmingmentioning

confidence: 99%

Impact of movement and motion-artefact correction on image quality and interpretability in CBCT units with aligned and lateral-offset detectors

Santaella

Wenzel

Haiter-Neto

et al. 2020

Dentomaxillofacial Radiology

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“…We used ballistic gelatin to simulate soft tissue. Other studies have used water, ice, wax, ultrasound gel, and acrylic resin to simulate soft tissue [ 17 , 37 , 38 ]. A recently study has introduced ballistic gelatin as the best simulator of soft tissue [ 39 ].…”

Section: Discussionmentioning

confidence: 99%

“…The bone block containing the implant was subsequently placed in center region of the five phantoms and fixed with silicon molding material. After bone block placement, the phantom was filled by ballistic gelatin made as described in previous studies [ 17 ]. The bone block was removed after each scan and positioned into the central regions of other phantoms.…”

Section: Methodsmentioning

confidence: 99%

Does the size of an object containing dental implant affect the expression of artifacts in cone beam computed tomography imaging?

et al. 2022

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Background Artifacts fault image quality but handling several factors can affect it. This study was conducted to investigate the effect of object size on artifacts in cone-beam computed tomography systems. Methods Five phantoms, each containing a titanium implant in a sheep bone block, were fabricated of various sizes ranging from XS to XL: The M phantom was the same size as the device’s field of view (FOV). The L and XL phantoms were 20 and 40% larger than the FOV while the S and XS phantoms were 20 and 40% smaller than FOV, respectively. Ballistic gelatin was used to fill the phantoms. Phantoms were scanned by NewTom VGI and HDXWill Q-FACE. The mean and standard deviation (SD) of gray values in each 120 ROI was obtained by OnDemand software. The contrast to noise ratio (CNR) was also calculated. Results The gray value in S and M phantoms were more homogenous. The lowest SD value (10.20) was found in S phantom. The highest value for SD (125.16) was observed in XL phantom. The lowest (4.47) and highest (9.92) CNR were obtained in XL and S phantoms, respectively. HDXWill Q-FACE recorded a higher SD and a lower CNR than NewTom VGI (P < 0.05). Conclusion Object dimensions of the FOV size or up to 20% smaller provided better image quality. Since the dimensions of soft tissue in most patients are larger than the selective FOV, it is recommended that in CBCT artifacts studies, an object with dimensions closer to the patient’s dimensions be used to better relate the results with the clinical condition, because the sample dimensions affect the amount of artifacts.

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“…Varios autores han utilizado cabezas de animales para el estudio de los VDEG en TCHC, ya sean cerdos 11,12 u ovejas. La colocación de los materiales en piezas dentales de los especímenes, permite asemejarse más al medio oral, ya que se conserva el hueso alveolar, la gíngiva, los músculos y demás tejidos normalmente presentes en condiciones clínicas.…”

Section: Discussionunclassified

Valores de densidad en la escala de grises de materiales restauradores mediante tomografía computarizada de haz cónico. Estudio piloto.

Ruiz-Imbert

2021

Odontol. Act.

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Objetivo de estudio: Determinar el valor de densidad en la escala de grises (VDEG) de tres materiales de obturación coronaria, mediante Tomografía Computarizada de Haz Cónico (TCHC). Materiales y métodos: Se seleccionaron seis cabezas de cerdo y a cada una se le realizó una restauración coronaria en la pieza 72, utilizando uno de los siguientes materiales: amalgama, resina o Cention N®, obteniendo dos muestras para cada material. Se adquirieron dos tomografías de cada espécimen, una de campo de visión pequeño (4x4cm) y otra de campo de visión grande (8x8cm), con parámetros de exposición fijos (90kV, 5mAs), para una muestra total de 12 tomografías. Se registraron los VDEG de los materiales para calcular el promedio de cada material. Resultados y conclusiones: Se observó que el VDEG promedio fue de 27 929.85 para amalgama, 5.798,54 para resina y 5.885,47 para Cention N®. A pesar de que se observa una variación en los VDEG de cada material al cambiar el tamaño de campo, dicha diferencia no es estadísticamente significativa.

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Evaluation of soft tissues simulant materials in cone beam computed tomography

Abstract: The ballistic gelatin was the best soft tissue simulant since it had the lowest influence on the pixel intensity values for all regions.

Cited by 18 publications

References 22 publications

Impact of movement and motion-artefact correction on image quality and interpretability in CBCT units with aligned and lateral-offset detectors

Impact of movement and motion-artefact correction on image quality and interpretability in CBCT units with aligned and lateral-offset detectors

Does the size of an object containing dental implant affect the expression of artifacts in cone beam computed tomography imaging?

Valores de densidad en la escala de grises de materiales restauradores mediante tomografía computarizada de haz cónico. Estudio piloto.

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