DANIEL VILLANI
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Resumo IPEN-doc 30128 Step-by-step of 3D printing a head-and-neck phantom: proposal of a methodology using fused filament fabrication (FFF) technology2023 - SAVI, M.; VILLANI, D.; ANDRADE, M.A.B.; SOARES, F.A.P.; RODRIGUES JUNIOR, O.; CAMPOS, L.L.; POTIENS, M.P.A.Resumo IPEN-doc 30115 Computed Tomography Imaging analysis of a fused filament fabrication (FFF) 3D printed neck-thyroid phantom for multidisciplinary purposes2023 - VILLANI, DANIEL; SAVI, M.; RODRIGUES JUNIOR, O.; POTIENS, M.P.A.; CAMPOS, L.L.Resumo IPEN-doc 29307 Development of a fused filament fabrication (FFF) 3D printed neck-thyroid phantom for multidisciplinary purposes2022 - VILLANI, D.; SAVI, M.; RODRIGUES JUNIOR, O.; CAMPOS, L.L.Purpose: Phantoms, devices that represent the human body, have been used in the fields of medical physics, physics and biomedical engineering since the beginning. The use of 3D printing and filaments commonly found commercially for the development of phantoms is being investigated recently. The application of this technique for the development of low-cost simulators requires a complex study of the interaction of printed materials with different types and qualities of radiation, as well as the characterization of print configurations. By making these measurements, it is possible to find methodologies so that they can correctly simulate human tissue. This study aims to describe the process of design and manufacture an anthropomorphic neck-thyroid phantom using a fused filament fabrication (FFF) 3D printer and tissue-equivalent materials for multidisciplinary purposes. Materials and Methods: To this study, the commercial phantom ATOM MAX 711, from CIRS, was used as an anatomical reference for the 3D modeling base of the neck-thyroid phantom. Commercially available PLA and ABS XCT-A developed at IPEN were used in the 3D printing process in order to simulate soft and bone tissues respectively. It was used the RAISE3D PRO 2 FFF printer from IPEN. The usability validation of the phantom was performed through the analysis of images from a computed tomography (CT) acquisition. The Hounsfield Units (HU) numbers were compared between the 3D printed and the ATOM MAX 711 phantoms to each type of tissue represented. A thyroid accessory was also developed on the purpose of immobilization of radioactive material with epoxy resin. Results: The modeling methodology of the 3D phantom of this study opens possibilities for using tomographic images of any objects, or even patients, to perform 3D prototyping of increasingly specific and customized simulators. The CT image analysis show great results on the analysis of the construction of the soft tissue with PLA filaments; construction of the bone tissues with ABS XCT-A; analysis of the construction of the thyroid accessory with epoxy resin; analysis of the spacing of the fit of the printed pieces; and analysis of image artifacts caused by the FFF technique. Conclusions: The developed phantom presents the desirable characteristics for applications in radiation protection, measurements of radioisotopes incorporated in the thyroid (both contamination counters and nuclear medicine detectors) and training of techniques of acquisition of images with X rays. It is a viable alternative to a tissue-equivalent phantom; and low cost when compared to other commercially available options.Resumo IPEN-doc 29176 Study on depth of measurement and volume variation of nuclides used in nuclear medicine for “in situ” ionization chamber characterization2022 - BUENO, L.K.; VILLANI, D.; RODRIGUES JUNIOR, O.; POTIENS, M.P.A.Artigo IPEN-doc 28659 Development of FFF filaments for bone and teeth representation in 3D printed radiological objects2022 - SAVI, M.; ANDRADE, M.A.B.; VILLANI, D.; RODRIGUES JUNIOR, O.; POTIENS, M.P.A.The use of 3D printing technologies is growing widely, including the possibility of designing phantoms for imaging and dosimetry. High attenuation tissues such as cortical bone, dentin and enamel need to be simulated to accurately produce 3D printed phantoms, especially for Fused Filament Fabrication (FFF) printing technology. A commercially available radiopaque FFF filament had been hard to find. This study aims to report, step-by-step, the development of a radiopaque FFF filament. A combination of radiopaque substances (Barium Sulfate - BaSO4 and Calcium Carbonate - CaCO3) were selected for use as fillers in an Acrylonitrile Butadiene Styrene (ABS) matrix and added in quantities calculated using the National Institute of Standards and Technology (NIST) XCOM tool. The filament was homogenized and characterized by analyzing its density and images obtained using Scanning Electron Microscopy (SEM), Computed Tomography (CT) and micro-CT (μCT) scans. Three filaments were produced with different Hounsfield Units (HU) equivalences: XCT-A (1607HU), XCT-B (1965HU) and XCT-C (2624HU) with respective densities of 1.166(6) g/cm³, 1.211(2) g/cm³ and 1.271(3) g/cm³. With these values, high attenuation tissues, such as bones, dentine and enamel, can now be simulated with FFF 3D printing technology, at a low cost of production.Artigo IPEN-doc 28658 Attenuation properties of common 3D printed FFF plastics for mammographic applications2022 - OLIVEIRA, M.V.L.; SAVI, M.; ANDRADE, M.A.B.; VILLANI, D.; POTIENS, M.P.A.; BRANCO, H.S.; UBEDA, C.; MDLETSHE, S.The aim of this study was to evaluate the feasibility of using acrylonitrile butadiene styrene (ABS) and polylactic acid (PLA) 3D printing filaments as materials for mammography phantom construction, comparing their attenuation properties at two different set-ups: at a Calibration Laboratory and directly to a mammography unit. The attenuation of 3D printed test phantoms of two types of common 3D printing Fused Filament Fabrication (FFF) filaments (ABS and PLA) were characterized in comparison with polymethylmethacrylate (PMMA). The measurements were carried out with standard IEC 61267 X-rays, using RQR 2-M and RQR 4-M beam qualities at the Instruments Calibration Laboratory, and then applied to a mammography unit, with measurements with 28 kV and 35 kV. Attenuation characteristics evaluated indicate the suitable equivalence of PLA to PMMA for 3D printing breast complex phantoms. The plastic materials used in this study suggest that the FFF technique may be suitable for mammography phantom development.Artigo IPEN-doc 28333 Dosimetric characterization of 3D printed for 137Cs gamma rays2021 - ALMEIDA, J.S.; VILLANI, D.; POTIENS, M.P. A.; WILLEGAIGON, J.The aim this paper is characterize materials for 3D printed with different infill percentages for 137Cs gamma rays. The RAISE 3D PRO2 printer was used to print PLA and ABS plates. Using a 137Cs source, the attenuation coefficient was obtained by the transmission method and results compared with PMMA. The readings were performed by a Radcal ionization chamber, model 10X6-6. The results of attenuation coefficients show that the PLA filament demonstrated a equivalent behavior to PMMA. The PLA plates exhibits an increase in radiation transmission when reduces the infilling, and ABS printing achieved same results for all infills.Artigo IPEN-doc 28208 Development of a 3D printed anthropomorphic skull phantom for clinical photons beam dosimetry2021 - ALMEIDA, S.B.; VILLANI, D.; CAMPOS, L.L.Tese IPEN-doc 28011 Desenvolvimento de um simulador antropomórfico de pescoço-tireoide tecido-equivalente impresso em 3D para aplicações multidisciplinares2021 - VILLANI, DANIELObjetos simuladores (no inglês, phantoms), dispositivos que representam o corpo humano, têm sido usados nas áreas da física médica, física e engenharia biomédica desde o início. Logo após a descoberta dos raios-X, as notícias dos benefícios médicos da radiação se espalharam rapidamente. A geometria e a composição de um simulador são determinadas pela prática a qual será aplicado. Existem desde os mais simples, baseados em água para medir a saída de feixes de terapia de megavoltagem, aos de maior complexidade, antropomórficos para controle de qualidade em radioterapia. O uso de impressão 3D e filamentos comumente encontrados comercialmente para o desenvolvimento de simuladores está sendo investigado. A aplicação desta técnica para o desenvolvimento de simuladores de baixo custo requer um estudo complexo da interação dos materiais impressos com diferentes tipos e qualidades de radiação, bem como a caracterização de configurações de impressão. Realizando essas medições, é possível encontrar metodologias para que possam simular corretamente o tecido humano. O objetivo desse trabalho constitui no projeto e na construção de um objeto simulador antropomórfico de tireoide (pescoço), utilizando uma impressora 3D e materiais tecido-equivalentes, para ser utilizado em aplicações multidisciplinares. Estudos de equivalência a tecidos humanos para filamentos de PLA, ABS e ABS XCT desenvolvidos no IPEN foram realizados em feixes de fótons padrão. Utilizou-se como base anatômica e de modelagem 3D o simulador comercial ATOM MAX 711, da CIRS. Os dados experimentais mostram a possibilidade de alcançar condições de equilíbrio eletrônico com as mesmas especificações de espessura para PLA e ABS, possibilitando a substituição do PMMA em diversas aplicações dosimétricas. Os filamentos de ABS aditivados com BaSO4 desenvolvidos no IPEN possuem propriedades de atenuação aumentadas significativamente em relação ao ABS puro, PLA e PMMA e são equivalentes aos tecidos ósseos nos feixes estudados. Diferentes tecidos ósseos podem ser simulados com uso de diferentes percentuais de infill. A metodologia de modelagem do simulador 3D deste estudo abre possibilidades de uso de imagens tomográficas de quaisquer objetos, ou até mesmo pacientes, para realização de prototipagem 3D de simuladores cada vez mais específicos e customizados. O simulador desenvolvido apresenta todas as características desejáveis para aplicações em proteção radiológica, dosimetria utilizando detectores TL/OSL, medições de radioisótopos incorporados na tireoide (tanto contadores de contaminação, quanto detectores de medicina nuclear) e treinamento de técnicas de aquisição de imagens por raios-X. Constitui uma alternativa viável de simulador equivalente a tecido; e de baixo custo, se comparado com os simuladores importados.Artigo IPEN-doc 27826 Study on attenuation of 3D printing commercial filaments on standard X-ray beams for dosimetry and tissue equivalence2021 - SAVI, M.; VILLANI, D.; ANDRADE, M.A.B.; RODRIGUES JUNIOR, O.; POTIENS, M.P.A.3D printing techniques and materials have become widely available in the last couple of decades and remains an important topic of research as the equipments and supplements gets chipper. This study aims to evaluate the attenuation behaviour of several commercially available 3D printing filaments (ABS and PLA-based filaments and other polymers blends) over standard X-ray beams ranging from ~30 keV - to ~50 keV and comparing the experimental results with theoretical data of Cortical Bone, Soft Tissue and PMMA. It was used the transmission method to obtain experimental attenuation coefficients to all materials. HVL for the materials were also calculated. Results show that PLA-based printing filaments mixed with metals (Al, BRASS and Cu) has higher attenuation than pure PLA. Comparing the experimental data with theoretical cross section of Soft Tissue, Cortical Bone and PMMA, it was possible to observe that with the increase of beam energy, ABS-based and other blends’ attenuation behaviour agree with PMMA/Soft tissue. None of the studied materials showed agreement of attenuation with Cortical Bone. Some variations of PLA (SILK, Black and Bone) and some of the other blends of PETG and TPU showed good agreement with Soft Tissue/PMMA since about 30 keV and it can be concluded that these filaments can be used as substitute of PMMA for mimetizing soft tissue in 3D printed phantoms.