INSTITUTO DE PESQUISAS ENERGÉTICAS E NUCLEARES
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Navegação Eventos - Resumos por Agências de fomento "Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)"

Navegação Eventos - Resumos por Agências de fomento "Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)"

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  • IPEN-DOC 27994

    CASTRO, PEDRO ; LIMA, CASSIO ; ZORN, TELMA; ZEZELL, DENISE M. . Assessment of burn wounds status using mid-infrared spectroscopy. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 7-9, 2019, São Paulo, SP. Abstract... Piscataway, NJ, USA: IEEE, 2019. p. 20-21.

    Abstract: Burns are one of the major causes of morbidity and the most costly traumatic injuries worldwide. Better understanding of the molecular mechanisms associated with wound healing might provide improved clinical strategies to speed up the tissue repair process and reduce the global impact of burns on public health services. The traditional techniques used to assess the biochemical events related to wound repair are laborious, time-consuming and require multiple staining. Thus, the present study aims to evaluate the feasibility of Fourier transform infrared (FTIR) spectroscopy in order to monitor the progress and healing status of burn wounds. Third-degree burn injuries were induced on Wistar rats by water vapor exposure. Afterwards, biopsies specimen was extracted for further histopathological examination and spectroscopic evaluation at 4 time-points (3, 7, 14 and 21 days). Raw spectral data were offset-corrected and normalized by amide I band area. The second derivatives were compared by the Principal Component Analysis (PCA). On days 3 and 7, when compared to healthy group, biomolecules bands were most prominent. However, on days 14 and 21, these molecular bands decreased. Therefore, our pairwise comparison revealed that metabolic activity induced by thermal injury decreases as the healing process progresses. Our findings show that FTIR spectroscopy can monitor the biochemical development induced by burn injury and detect the status of wound repair.

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  • IPEN-DOC 27450

    AMARAL, M.M.; DEL-VALLE, M. ; RAELE, M.P. ; PRETTO, L.R. de ; ANA, P.A.. Assessment of osteoporosis through laser speckle imaging: an in vitro model. In: BRAZILIAN CONGRESS IN BIOMEDICAL ENGINEERING, 27th, October 26-30, 2020, Vitória, ES. Abstract... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2020. p. 66-67.

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  • IPEN-DOC 25613

    CASTRO, PEDRO A.A. de ; ZEZELL, DENISE M. ; MORAIS, MYCHEL R.P.T.; ZORN, TELMA M.T.. ATR-FTIR spectral monitoring of burn wound healing in skin by hierarchical cluster. In: ENCONTRO DE OUTONO, 41., 06-11 de maio, 2018, Foz do Iguaçu, PR. Resumo... São Paulo: Sociedade Brasileira de Física, 2018. p. 1-1.

    Abstract: Efficient biochemical characterization of burn wound healing stages can improve clinical routine to adjust the patient treatment. The Fourier Transform Infrared spectroscopy coupled with Attenuated Total Reflectance (ATR-FTIR) is an analytical technique that has potential capability to provide spectral biomarkers in biological material. This study aims to evaluate the feasibility of using ATR-FTIR to classify burned skin, to be able, in the future, to follow the regenerative process in patients. Wistar rat burn tissues were evaluated by ATRFTIR spectroscopy at 3, 7, 14, 21 days after burn and compared with the healthy group samples (H). For the acquisition of one spectrum, 150 scans were averaged with a resolution of 4 cm-1 and wavenumbers ranging from 4000 to 400 cm-1. Analysis of the spectra was performed using MatLab R2017a (MathWorks, EUA) software. The fingerprint region between 900 to 1800 cm-1 was separated and normalized by amide I band area. For smoothing purpose, spectra were submitted to Savitzky-Golay filter with a polynomial of second order in a fifteen points window. All spectra data were submitted to the hierarchical cluster using the single method and standardized Euclidean distance. The classification results demonstrated separation to non-wounded groups with an accuracy of 91,8% (H vs. 3D), 87,83% (H vs. 7D) and 97,96% (H vs. 14D). Interestingly, when the results from the healthy group were compared to the 21D group, the accuracy dissimilarity was 26%, which suggests that they are chemically similar implying that after 21 days the burned lesions are entirely recovered. These findings indicate that when an adequate multivariate method is applied, ATR-FTIR is suitable to detect the wounded and non-wounded skin as well as its healing stages. In this way, it is possible to conclude that ATR-FTIR can be an auxiliary analysis for the clinical routine for skin burn wound healing.

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  • IPEN-DOC 27072

    AMARAL, M.M. ; TEIXEIRA, L.R.C. ; CARVALHO, M.T.; GOMES, A.S.L.; ZEZELL, D.M. . Avaliação da espessura da epiderme em hemangioma por optical coherence tomography. In: VIEIRA NETO, HUGO (Ed.); SOARES, ALCIMAR B. (Ed.); FÉLIX, RODRIGO P.B. da C. (Ed.); VIEIRA NETO, HUGO (Org.); MAIA, JOAQUIM M. (Org.); PICHORIM, SÉRGIO F. (Org.); GAMBA, HUMBERTO R. (Org.); COSTA, EDUARDO T. (Org.) CONGRESSO BRASILEIRO DE ENGENHARIA BIOMÉDICA, 25., 17-20 de outubro, 2016, Foz do Iguaçu, PR. Resumo... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2016. p. 2331-2331.

    Abstract: Introdução: Os Hemangiomas são lesões vasculares que comumente encontradas na região da cabeça e pescoço, atingindo cerca de 10% das crianças ao redor do mundo [1]. O diagnóstico precoce pode levar ao tratamento das lesões e redução de suas consequências estéticas e psicológicas causadas ao paciente. A biopsia excisional é o padrão ouro para diagnostico a nível celular, porém é uma técnica invasiva e que pode causar efeitos colaterais. As alternativas não invasivas disponíveis são a tomografia computadorizada (CT), a imagem por ressonância magnética (MRI) e o ecografia por ultrassom (US) [1, 2]. Tanto o CT quanto o MRI apresentam um custo proibitivo para aplicações clínicas de rotina. Já o US está presente em hospitais e possui custo mais acessível com aplicações no diagnóstico vascular. A imagens US atinge camadas profundas com resolução e alguns milímetros no do tecido biológico, não atendendo aos hemangiomas que aparecem nas camadas mais superficiais da pele. Uma possível alternativa é a técnica Optical Coherence Tomography (OCT) que produz imagens em seção transversal com resolução micrométrica do tecido biológico utilizando luz. Ela encontra aplicações na dermatologia [3] e pode ser usado para caracterização funcional, óptica ou morfológica de tecido biológico. O objetivo deste trabalho foi avaliar as diferenças de espessura da epiderme em regiões de lesão vascularizada e normal utilizando a técnica OCT. Materiais e Métodos: As imagens OCT foram adquiridas utilizando-se um sistema OCT swept source com resolução axial de 9 μm e lateral de 18 μm. As imagens possuem 512x1024 pixel (axial x lateral) e foram adquiridas a uma taxa de 25 quadros / s. Este estudo foi aprovado pelo Comitê de Ética do IMIP (protocolo no. 728.993). Neste estudo fo ram utilizadas imagens da mão de um paciente nas regiões de hemangioma e pele sadia, possibilitando a identificação de suas diferenças. Foi implementado um algoritmo em ambiente Matlab para determinar a espessura da epiderme em todas as 541 imagens de lesão vascularizada e as 50 de pele normal. Resultados: Através da medição automatizada da espessura da epiderme na região de lesão e sadia (figura 1) foi possível observar a distribuição de profundidade em cada uma destas regiões. A região de lesão possui uma distribuição de profundidade mais estreita e com espessura menor que a de pele normal. Já a região de pele normal apresenta uma distribuição mais larga, porém com dois valores de maior probabilidade, isso se deve tanto a presença de glândulas mais visíveis na pele sadia quanto a uma maior presença de papilas dérmicas na junção derme-epiderme. Conclusões: A medição da espessura da epiderme mostrou-se válida como um possível marcador da presença de hemangioma. O uso desta abordagem poderia ser complementar a outros marcadores possíveis de serem extraídos do sinal OCT. A ampliação do painel de estudo e comparação com outras técnicas padrão ouro deverá ser realizada em futuros estudos.

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  • IPEN-DOC 24937

    CASTRO, PEDRO A.A. de ; DIAS, DERLY A. ; VELOSO, MARCELO N. ; ZEZELL, DENISE M. . Biochemical evaluation of bone submitted to ionizing radiation by ATR-FTIR spectroscopy. In: CONFERENCE ON LASERS AND ELECTRO-OPTICS, May 14-19, 2017, San Jose, California, USA. Resumo expandido... Washington, DC, USA: OSA, 2017.

    Abstract: FTIR spectroscopy associated with PC-LDA was able to discriminate bone samples receiving different ionizing radiation doses (0,01 kGy, 1 kGy, 15 kGy), showing potential to the use of phosphate vibrational modes as a dose marker. OCIS codes: (170.4580) Medical optics and biotechnology – Optical diagnostics for medicine; (170.6510) Medical optics and biotechnology – Spectroscopy, tissue diagnostics; (170.1580) Medical optics and biotechnology – Chemometrics.

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  • IPEN-DOC 28122

    DEL-VALLE, M. ; SANTOS, M.O. ; SANTOS, S.N. dos ; BERNARDES, E.S. ; ZEZELL, D.M. . Breast cancer estrogen and progesterone receptors evaluation using FTlR spectroscopy imaging: a pilot study. In: IUPAB CONGRESS; ANNUAL SBBF MEETING; ANNUAL SBBQ MEETING, October 26-30, 2020, Foz do Iguaçu, PR. Abstract... 2020.

    Abstract: INTRODUCTION. Breast cancer is the second leading cause of cancer death in woman worldwide with an incidence of 2.09 million and 627 thousand deaths in 2018. Histopathology is the gold standard method for cancer diagnosis and identification of therapeutic targets, however it still presents interpretation difficulties, especially when comparing different cancer subtypes. OBJETICVE: The aim of this study was to evaluate Fourier transform infrared (FTIR) spectroscopy in the diagnose and differentiation of molecular differences between two different breast cancer subtypes: positive and negative for estrogen (ER) and progesterone (PR) receptors. METHODS: Two human breast cell lines, BT474 (ER and PR positive) and SKBR3 (ER and PR negative), were inoculated in Balb/c nude mice. Tumors were collected when reached 0.5 cm3, processed by formalin fixation and paraffin embedding. 5μm thick tissue cuts were fixed in low-e slides (MirrIR, Kevley Technologies). Spectral images were performed in a micro-FTIR (Cary 660, Agilent Technologies) with 32 x 32 FPA of 5.5 μm pixel size. Scattering correction (RMieS-EMSC) was performed using MATLAB and remaining processing using Python. Groups differentiation were evaluated by PCA from 1350 to 1000 cm-1 second derivatives. RESULTS AND DISCUSSION: Groups were split in two clusters, separated by PC-1 with a 99 % accuracy in both groups and 45 % of explained variance. The absorptions in the selected region for the PCA were mainly related to DNA, RNA and protein content. The main contribution was presented by the 1238 cm-1 peak, which was correlated with nucleic acids symmetrical stretching. Hyperspectral image built from this peak presented a spatial correlation with the microscope white light imaging, indicating that possible region for histopathological correlation might be present. CONCLUSAO: Our pilot study shows that FTIR spectroscopy imaging can distinguish ER/PR positive from negative breast cancer subtypes.

    Palavras-Chave: neoplasms; mammary glands; diagnostic techniques; histology; fourier transformation; infrared spectra

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  • IPEN-DOC 26005

    ZAMATARO, CLAUDIA B. ; KUCHAR, NIELSEN G. ; SCAPIN, MARCOS A. ; ZANINI, NATHALIA ; CASTRO, PEDRO ; RABELO, THAIS F. ; JUVINO, AMANDA C. ; ZEZELL, DENISE . Calcium analysis from gamma sterilized human dentin and enamel. In: ENCONTRO DE OUTONO DA SOCIEDADE BRASILEIRA DE FÍSICA, 42., 26-31 de maio, 2019, Aracaju, SE. Resumo... São Paulo: Sociedade Brasileira de Física, 2019.

    Abstract: Gamma radiation changes the patients0 oral cavity undergoing radiotherapy. Alterations cause an unsaturated environment of calcium and phosphate into the oral cavity. After approval of the Ethics Committee, 20 hu- man teeth were sectioned to obtain 20 human enamel and 20 dentin samples, polished plane. Samples were randomized in the irradiated group and control group (untreated). Then, the treatment group was irradiated with 25:0 kGy at the 60Co multipurpose irradiator. After the gamma irradiation, Fourier Transformed Infrared Spectroscopy (FTIR), percentage of surface microhardness loss (%SMHL) and Scanning Electron Microscopy (SEM) were performed. At the end, acidic biopsies were performed to quantify the concentration of calcium present in the samples. FTIR showed that the molecular structure of HA of the enamel is similar to the non- irradiated, with no formation or loss of molecular compounds occurring. X-ray °uorescence at enamel samples was performed. Microscopic morphological analysis did not shown signi¯cant di®erences. Surface microhardness is an indirect indicator of the mineral content of the samples. The mean obtained was 258:2 (38:8) KHN within the hardness spectrum of the healthy natural enamel. The compounds present in the samples and the values of the ratios of Calcium and Phosphate oxides and relation between the elements Calcium and Phosphorus. The ratio of the most stable oxides shows a variation with linear correlation. In the enamel, the ratio (Ca/P) shows a change in the elemental content with linear correlation (R2 = 1). These ¯ndings lead us to a new hypothesis of behaviour of the HA crystal versus gamma irradiation. On the other hand for the irradiated dentin, the Knoop hardness number was within the range of the spectrum similar to that of natural dentin of human origin. X-ray °uorescence shows that irradiated dentin has great similarity with natural dentin from the point of view of chemical composition. SEM analyses showed that there was no thermal damage or interprismatic morpho- logical changes in the hydroxyapatite structure of human dental dentin outside the buccal environment when using doses of gamma irradiation up to 25 kGy.

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  • IPEN-DOC 29563

    TAPPIZ, BRUNO ; SILVA, PAULO S.C. da ; OSTERMANN, CAROLINE ; LIMA, NICOLE P. de ; ANDRADE, MARIANA N. de ; BUSTILLOS, OSCAR V. . Comparison of 238U mass fraction measured by ICP–MS and Instrumental Neutron Activation Analysis techniques. In: SIMIONATO, ANA V.C. (Coord.) IBEROAMERICAN CONFERENCE ON MASS SPECTROMETRY, 3rd, December 10-15, 2022, Rio de Janeiro, RJ. Abstract... Campinas, SP: Sociedade Brasileira de Espectrometria de Massas - BrMASS, 2022. p. 237-238.

    Abstract: Introduction: Uranium is an element present in ambient air, water, soil and rocks [1]. The most abundant natural radioisotope of this actinide (238U) produces in its chain decay the radionuclide 222Rn [2], which is a tracer for atmospheric mixing and transport model validations [3]. The 238U activity concentration in superficial soil samples is a crucial parameter for some 222Rn flux map modeling methodologies [4]. Methods: In this study, 18 superficial soil samples were analyzed. The content of 238U was assessed using two techniques: (i) by the comparative method of the Instrumental Neutron Activation Analysis (INAA) [5] and by ICP–MS (ELAN 6000, PerkinElmer) [6]. Certified Reference Materials (CRM) SRM 1646a Estuarine Sediment and USG STM–2 were used both as comparators in the INAA technique and to ensure quality control. The normality and homoscedasticity of the data were evaluated. Finally, the Mann- Whitney U test [7] was used to assess whether or not there is a significant difference (α = 0.05) between the two techniques. Results: The z-score was calculated to ensure quality control. Z-scores values was obtained by the Modified Horwitz Equation [8], which takes into account the order of magnitude of the content of the analyte and is independent of the CRM uncertainties, unavailable for the CRM used. The z-score values obtained (n = 3) for the radionuclide 238U were 0.5 for the CRM USG STM–2 and -0.4 for SRM 1646a. The z-scores obtained are smaller than 2 therefore they are considered satisfactory [9]. Regarding the statistical parameters of the comparison between the techniques, the normality (Shapiro Wilk) was not verified (p = 0.02 for ICP-MS and p = 0.03 for INAA). The p-value for the test for equal variances (F test) was 0.71 Mann-Whitney U test was used instead of Student’s test due to the non-verification of the normality parameter in the data. The p-value from the Mann-Whitney test (0.51) indicates that there is no significant difference between the 238U content measured by the two techniques. Conclusions: Statistical analysis showed that there is no significant difference between the 238U mass fraction measured by the ICP–MS and the INAA – comparative method. In the future, certified reference materials will also be assessed by ICP–MS in order to corroborate this statistical comparison from a metrological point of view.

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  • IPEN-DOC 29201

    TEODORO, LARA E.H. ; TALACIMON, CRISTHIAN F. ; ROSERO, WILMMER A.A. ; RIGO, MARIA E.Z. ; RODRIGUES, PRISCILA S. ; NOGUEIRA, THUANY C. ; ANGELOCCI, LUCAS V. ; ROSTELATO, MARIA E.C.M. . Development of a new material to encapsulate phosphorus-32 for use in brachytherapy. In: BRAZIL MRS MEETING, 20th, September 25-29, 2022, Foz do Iguaçu, PR. Abstract... São Carlos, SP: Aptor Software, 2022.

    Abstract: The term cancer refers to a set of malignant diseases that have in common the disordered growth of mutated cells, which can invade adjacent tissues or distant organs[1]. In 2020, cancer of the central nervous system (CNS) represented 1.6% of all new malignant tumor cases in the world, and about 2.5% of all new cancer deaths[2]. A promising radioactive source for use in intracavitary brachytherapy is phosphorus-32. This source has been prominent as a minimally invasive treatment for craniopharyngiomas and in the treatment of metastatic bone diseases in general[3]. To encapsulate phosphorus-32 and make it a viable radioactive source for use in medicine, some methods have emerged. In this work, we are developing a fabric soaked in industrial latex for this purpose, as this source comes in the form of orthophosphoric acid in aqueous solution and as industrial latex is soluble in water. Tests carried out so far show that the material supports orthophosphoric acid while is still malleable, which is essential for treating spinal cancer.

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  • IPEN-DOC 25604

    LIMA, CASSIO A. ; CORREA, LUCIANA; BYRNE, HUGH J.; ZEZELL, DENISE M. . Diagnosis of advanced skin cancer using Infrared spectral histopathology. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, November 12-15, 2018, Lima, Peru. Resumo expandido... Washington, DC, USA: OSA, 2018.

    Abstract: In this study, we investigated the feasibility of Infrared Spectral Histopathology to diagnose invasive squamous cell carcinoma using hematoxylin and eosin stained tissue placed on conventional glass slides, as used in the pathologist workflow.

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  • IPEN-DOC 24936

    LIMA, CASSIO ; ZEZELL, DENISE . Discrimination of healthy skin and cutaneous malignant lesions using FTIR spectra and their second derivatives: a comparative study. In: CLINICAL AND TRANSLATIONAL BIOPHOTONICS, April 3-6, 2018, Hollywood, Florida, United States. Resumo expandido... Washington, DC, USA: OSA, 2018.

    Abstract: PC-LDA statistical method was used to differentiate cutaneous tumor tissue from healthy skin. Discrimination accuracy obtained by raw FTIR spectra was 95% and by second derivatives 92%, besides identifying secondary structure of proteins and collagen.

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  • IPEN-DOC 25602

    CASTRO, PEDRO A.A. de ; ZEZELL, DENISE M. . Discrimination of ionizing radiation effects on bone using Fourier Transform Infrared Spectroscopy using K-means. In: BIOPHOTONICS CONGRESS: BIOMEDICAL OPTICS, April 3-6, 2018, Hollywood, Florida, USA. Resumo expandido... Washington, DC, USA: OSA, 2018.

    Abstract: We demonstrated the feasibility of using ATR-FTIR spectroscopy associated with k-means clustering to evaluate the recognition of different doses. Our results open up new possibilities for protein monitoring relating to dose responses.

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  • IPEN-DOC 29574

    DEL-VALLE, MATHEUS ; CARVALHO, MARCELO; SANTOS, MOISES ; PINTO, NATHALI; JATENE, FABIO; POMERANTZEFF, PABLO; BRANDAO, CARLOS; ZEZELL, DENISE . Evaluation of calcified mitral valves after Er,Cr:YSGG irradiation using Optical Coherence Tomography. In: INTERNATIONAL CONFERENCE ON LASER APPLICATIONS IN LIFE SCIENCES, 16th, April 1-2, 2022, Nancy, France. Abstract... Nancy, France: PROGEPI, 2022. p. 152-152.

    Abstract: Mitral valve is responsible to control the left atrium-ventricle blood flux. Mitral stenosis is a disease that occurs in consequence of calcification and fibrosis on the cuspids of the valve. Diagnosis can be performed using echocardiography.Many treatments are possible, and one of them is commissurotomy (surgical approach).High intensity laser irradiation may be a new strategy for this surgical technique[1], and the optical coherence tomography (OCT) may contribute to the valve evaluation[2], asit provides higherspatialresolutionin exchange of lower penetrationthan ultrasonography. In this way, the aim of this study is to evaluate laser irradiation effectsincalcified mitral valvesusing OCTand digital processing.To that, it was conducted an ex-vivostudywith four human mitral valvessamples,obtained from valve replacement surgeries in the Heart Institute.The samples were splitin four groups: scalpel cut, laser cut, scalpel debridement and laser debridement.Cutting and debridement procedures were performed in calcified regions of the valves, usinga disposable scalpelbladeand anEr,Cr:YSGG laser(Waterlase; Biolase Inc., CA, USA), emitting at 2780 nm. The laser parameters were set at power = 1.6W, frequency = 20 Hz, energy density = 28.3J/cm2,pulse duration = 700 μs, 15% of water and 15% of air.The imaging was performed using a spectraldomain OCT system(Callisto110C1;ThorLabs Inc., NJ, USA).It was acquired10 B-scans per sample, 5 inprocedures regions and 5 in sound regions. The Optical Attenuation Coefficient (OAC) was calculated by comparing a beer-lambert like equation to exponential fittings of the A-scans[3].The distribution and normality of variances were tested using Shapiro-Wilk test,and statistical comparison was performed using one-way ANOVA and Tukey’s post hoc. All tests considered a level of significance of 5%.The FigureAshows a representative B-scan of a visibly calcified region, where a pattern of higher intensities can be observed.Thispattern is related tomorphological and optical changes, mainly a refractive index change, due to calcium presence in the valve tissue.This B-scan was acquired only to understand the calcified tissue aspect, as the procedures regions does notpresent visibly largecalcium stones.The Figure Bshowsthe statisticalanalysis, where the sound OAC values, as a mean of all sound regions, presented a significant statistical difference in comparison to scalpel groups, while no difference waspresentedin relation to laser groups. Higher OAC values are related to anaugmentation of the light backscatteringdue to calcium refractive index, leading to a change of lightpropagation in tissue-calcium interfaces.This finding indicates thatthe laser procedures promoted a better removal of calcified tissue than the scalpelmethods, which can be related to tissue-ablation interaction.Furthermore, the statistical difference between scalpel cut group and both laser groups suggests that the scalpel needs more wear interaction with the tissue, such as in the debridement procedure, being unable to significatively remove the calcification in a single cut.This study points the Er,Cr:YSGG and the OCT as potential techniques for the calcified tissue removal and evaluation,respectively, duringmitral valvessurgeries, although further studieswith higher sample numbermust be performed.

    Palavras-Chave: cardiovascular system; valves; cardiovascular diseases; fibrosis; tomography; coherent radiation

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  • IPEN-DOC 25612

    TEIXEIRA, LUCIA R.C. ; CARVALHO, MARIANA T.; GOMES, ANDERSON S.L.; ZEZELL, DENISE M. ; AMARAL, MARCELLO M.. Evaluation of vascular lesions on cutaneous and mucosa tissue in head and neck regions by Doppler Optical Coherence Tomography. In: ENCONTRO DE OUTONO, 41., 06-11 de maio, 2018, Foz do Iguaçu, PR. Resumo... São Paulo: Sociedade Brasileira de Física, 2018. p. 1-1.

    Abstract: Vascular lesions are one of the most common congenital and neonatal abnormalities, 60% of the cases affect the head and neck region. In most cases these lesions involute spontaneously with no consequences for the patient health, although complications caused by tissue deformities occur in 10%. The proper diagnosis of the different lesions type has impact on the proper choice of patient treatment. The Optical Coherence Tomography (OCT) technique obtains non-invasive real-time cross-section images of tissue structures with high resolution (ª 5μm), about 20 times greater than ultrasound. One of the characteristics of vascular lesions are the presence of blood vessels on the superficial layer of the skin, not present on normal tissue. Using the so-called Doppler OCT it is possible to identify the presence of blood flow and vessels on OCT images. The aim of this work was to evaluate the differences in the architecture of blood vessels in different types of lesions on cutaneous and mucosa tissue in head and neck regions by Optical Coherence Tomography and Doppler Optical Coherence Tomography. After approved by the Ethics Committee of IMIP (protocol no. 728.993), 27 patient lesions were imaged using a Doppler-OCT system (OCS1300SS; Thorlabs GmBH), at 1325 nm of central wavelength and 100 nm of bandwidth. Using the ImageJ software, the average diameter and mean depth of the blood vessels were measured. The average diameter and mean depth of the blood vessels were respectively equal to 114μm ± 92μm and 304.3μm ± 99μm on vascular malformation, 38.6μm ± 19μm and 297.8μm ± 132μm on skin hemangiomas, 45μm ± 16μm and 520.5μm ± 189.5μm on oral mucosa hemangioma (lips), 157.5μm ± 90μm and 695μm ± 136μm on lip lymphatic malformation, and 128μm ± 63μm and 689μm ± 217μm on lip vascular malformation. Using the flow information provided by Doppler OCT, it was possible to evaluate the differences on each lesion type. It was possible to obtain a diagnosis method to differentiate each vascular lesion on skin and oral mucosa, providing information for the early stage treatment of the lesions which will evolute.

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  • IPEN-DOC 27537

    OSTERMANN, CAROLINE ; ZANNONI, NORA; CARVALHO, ELIAS F. de ; WILLIAMS, JONATHAN; VEGA, OSCAR . Exploratory study on chiral BVOC fluxes from tropical forests by REA method. In: ATTO WORKSHOP, 3rd, September 16-20, 2019, Manaus, AM. Poster... 2019.

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  • IPEN-DOC 27099

    OSTERMANN, CAROLINE ; ZANNONI, NORA; CARVALHO, ELIAS ; NOVAES, MARIANA ; WILLIAMS, JONATHAN; VEGA, OSCAR . Exploring chiral BVOCs in Amazon and Atlantic forest by TENAX® and Carbograph® sorbent. In: LATIN AMERICAN SYMPOSIUM ON ENVIRONMENTAL ANALYTICAL CHEMISTRY, 14th; ENCONTRO NACIONAL DE QUÍMICA AMBIENTAL, 9.; WORKSHOP EM AVANÇOS RECENTES NO PREPARO DE AMOSTRAS, 12.; SEMINÁRIO CORSAN DE PESQUISA E INOVAÇÃO, 2., November 6-8, 2019, Bento Gonçalves, RS. Poster... 2019.

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  • IPEN-DOC 23247

    RABELO, J.S. ; ANA, P.A.; MAZZOCCHI, V.L. ; VALERIO, M.E.G.; ZEZELL, D.M. . FTIR and XRD characterization of heat effect on nanostructured synthetic hydroxyapatite and dental enamel. In: INTERNATIONAL CONFERENCE OF NANOPHOTONICS, 10th, July 02-05, 2017, Recife, PE. Abstract... 2017. p. 55-55.

    Abstract: Nanometer sized HAP and dental enamel powders were evaluated regarding changes in their degree of crystallinity and composition after oven or Er,Cr:YSGG laser heating. Decrease of the Ca/P ratio to levels close to the theoretical ones for both synthetic nano-HAp and for the enamel was measured. Laser irradiation caused considerable decrease in the amount of carbonate in the materials heated to high temperatures, but without changes in crystallographic phase.

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  • IPEN-DOC 29573

    ZEZELL, DENISE ; CASTRO, PEDRO ; DEL-VALLE, MATHEUS ; CAMILLO-SILVA, CARLOS ; SAMAD, RICARDO ; DE ROSSI, WAGNER ; SANTOS, MOISES . FTIR imaging on glass substrates evaluation of histological skin burn injuries specimens treated by femtosecond laser pulses. In: INTERNATIONAL CONFERENCE ON LASER APPLICATIONS IN LIFE SCIENCES, 16th, April 1-2, 2022, Nancy, France. Abstract... Nancy, France: PROGEPI, 2022. p. 205-205.

    Abstract: Burn injuries continue to be one of the leading causes of unintentional death and injury in low- and middle-income countries [1]. Burns are considered an important public health problem, because in addition to physical problems that can lead the patient to death, they cause psychological and social damage. An estimated 180,000 deaths every year are caused by burns [2]. The use of infrared (IR) spectroscopy for studying biological specimens is nowadays a wide and active area of research. The IR microspectroscopy has proved to be an ideal tool for investigating the biochemical composition of biological samples at the microscopic scale, as well as its fast, sensitive, and label-free nature [3]. IR image spectral histopathology has shown great promise as an important diagnostic tool, with the potential to complement current pathological methods, reducing subjectivity in biopsy samples analysis. However, the use of IR transmissive substrates which are both fragile and prohibitively very expensive, hinder the clinical translation. The goal of this study is to evaluate the potential of discriminating healing process, in burned skin specimens treated with ultrashort pulses laser 3 days after the burn. This study is considering a previous paper [4], in which it analyzed only micro-ATR-FTIR spectra of a frozen sample point. The specimens were obtained from third degree burn wound. The wounds treatment were performed three days after the burn, and the animals were sacrificed 3 and 14 days post-treatment. Using coverslipped H&E stained tissue on glass from previous histopathological analysis and applying the analytical techniques PCA and K-means on N−H, O−H, and C−H stretching regions occurring at 2500−3800 cm−1 (high wavenumber region), were possible to discriminate burned epidermal and dermal regions from irradiated in same regions on sample. In the figures is shown the average spectrum at (a) day 3 and (b) day 14. , in both there were increase of burned+laser treated bands. The great potential of this study was to analyse coverslipped H&E stained tissue on glass, without compromising the histopathologist practices and contribute for clinical translation.

    Palavras-Chave: burns; injuries; animal tissues; infrared spectra; healing; lasers; pulses

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  • IPEN-DOC 25605

    CASTRO, PEDRO ; LIMA, CASSIO ; ZORN, TELMA M.T.; ZEZELL, DENISE M. . FTIR spectroscopy: an optical method to study wound healing process. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, November 12-15, 2018, Lima, Peru. Resumo expandido... Washington, DC, USA: OSA, 2018.

    Abstract: In this study, we investigated the ability of Fourier transform infrared spectroscopy to discriminate healthy tissue and thermal injury, aiming the development of an optical method to evaluate the wound healing process.

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  • IPEN-DOC 23457

    ZEZELL, DENISE M. . FTIR spectroscopy for diseases diagnosis. In: ENCONTRO DE FISICA, 03-07 de setembro, 2016, Natal, RN. Abstract... São Paulo: Sociedade Brasileira de Física, 2016.

    Abstract: Mid-infrared spectroscopy is a technique by which the chemical structure of an analyzed material can be identified; it also allows the semi-quantitative analysis of the components of the material. It has been already shown that Fourier transform infrared spectroscopy (FTIR) can be used to evaluate the effects of high-intensity laser irradiation on dentin and enamel tissues,as well as for the study of bone properties and several pathologies, such as lung, thyroid and skin cancer. The structural and biochemical changes associated with the development of enamel caries and also with the interaction of laser irradiation with the enamel, suggest that vibrational spectroscopy are promising techniques to differentiate sound and carious enamel, as well as detect changes due to laser irradiation. Considering that there is no agreement in the literature on the chemical changes promoted by the irradiation of Nd:YAG and Er,Cr:YSGG for preventive purposes on enamel, our studies aimed to determine these changes by FTRaman and FTIR spectroscopy and to investigate the influence of laser irradiation before or after the application of topical fluoride on the development of caries in vitro. Nonmelanoma skin cancers represent 95% of cutaneous neoplasms. Among them, squamous cell carcinoma (SCC) is the more aggressive form and shows a pattern of possible metastatic profile. In this work, we used Fourier transform infrared spectroscopy (FTIR) spectroscopy to assess the biochemical changes in normal skin caused by squamous cell carcinoma induced by multi-stage chemical carcinogenesis in mice. Changes in the absorption intensities and shifts were observed in the vibrational modes associated to proteins, indicating changes in secondary conformation in the neoplastic tissue. Hierarchical cluster analysis was performed to evaluate the potential of the technique to differentiate the spectra of neoplastic and normal skin tissue, so that the accuracy obtained for this classification was 92%. We develop a methodology to interpret hyperspectral imaging data and protein conformational changes observed in nomal thyroid tissue. Raw image datasets were imported into software written in-house in the MATLAB environment and processed to yield pseudo-color images of the tissue sections. All spectra were vector normalized, noisefiltered, and corrected for water-vapour contributions and scattering effects before being subjected to Hierarchical Cluster Analysis (HCA) and correlated with histological structures obtained from images of H&E-stained parallel tissue sections. We successfully identified a protein structural heterogeneity that can be correlated with the spatially resolved amount of iodine in the thyroglobulin structure of colloids and follicular cells. The chemical carcinogens from tobacco are related to over 90% of lung cancers around the world. The risk of death of this kind of cancer is high because the diagnosis usually is made only in advanced stages. Therefore, to develop new diagnostic methods for detecting the lung cancer in earlier is very important stages. The second derivate of spectra indicates that there are displacement in 1646 cm-1 (amine I) and 1255 cm-1 (DNA), allowing the possibility to differentiate the e10 lung normal cells from e10 lung cells transformed by tobacco substances (NKK) with accuracy of 89,9%.

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A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

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