A5025536850- Radiation Dose and Imaging
- Advanced Radiotherapy Techniques
- Advanced X-ray and CT Imaging
- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Digital Radiography and Breast Imaging
- Radiation Therapy and Dosimetry
- Radiation Effects and Dosimetry
- Medical Imaging Techniques and Applications
- Glass properties and applications
- Radiology practices and education
- Radioactivity and Radon Measurements
- Dental Radiography and Imaging
- Nuclear materials and radiation effects
- Semiconductor materials and devices
- Nuclear Physics and Applications
- Conducting polymers and applications
- Radiation Effects in Electronics
- Cultural Heritage Materials Analysis
- Mineralogy and Gemology Studies
- Breast Cancer Treatment Studies
- Analytical Chemistry and Sensors
- Organic Electronics and Photovoltaics
- AI in cancer detection
- Building materials and conservation
Universidade Federal de Pernambuco
2015-2024
Universidade de Pernambuco
1982-2024
Hospital das Clínicas da Universidade Federal de Pernambuco
2021
Universidade Federal do Paraná
2019
Instituto do Coração
2006
Real Hospital Português
2006
Université Paris Cité
2004
Centre National de la Recherche Scientifique
2004
The MAX (Male Adult voXel) phantom has been developed from existing segmented images of a male adult body, in order to achieve representation as close possible the anatomical properties reference specified by ICRP. study describes adjustments soft-tissue organ masses, new dosimetric model for skin, skeletal dosimetry and computational exposure based on coupling with EGS4 Monte Carlo code. Conversion coefficients between equivalent dose red bone marrow well effective air-kerma free air...
Among computational models, voxel phantoms based on computer tomographic (CT), nuclear magnetic resonance (NMR) or colour photographic images of patients, volunteers cadavers have become popular in recent years. Although being true to nature representations scanned individuals, limitations, especially when walled organs be segmented volumes body tissues, like adipose, changed. Additionally, the scanning patients is usually made supine position, which causes a shift internal towards ribcage,...
The International Commission on Radiological Protection (ICRP) has created a task group dose calculations, which, among other objectives, should replace the currently used mathematical MIRD phantoms by voxel phantoms. Voxel are based digital images recorded from scanning of real persons computed tomography or magnetic resonance imaging (MRI). Compared to phantoms, true natural representations human body. Connected radiation transport code, serve as virtual humans for which equivalent organs...
The International Commission on Radiological Protection (ICRP) is currently preparing new recommendations which will replace those released in ICRP 1991, 1990 Recommendations of the Publication 60 (Oxford: Pergamon). draft report previews a change for effective dose with respect to number organs and tissues be included its calculation. In future, adipose tissue, connective extrathoracic airways, gall bladder, heart wall, lymphatic nodes, prostate salivary glands have taken into account...
CALDose_X is a software tool that provides the possibility of calculating incident air kerma (INAK) and entrance surface (ESAK), two important quantities used in x-ray diagnosis, based on output equipment. Additionally, uses conversion coefficients (CCs) to assess absorbed dose organs tissues human body, effective as well patient's cancer risk for radiographic examinations. The CCs, ratios between organ or tissue doses measurable quantities, have been calculated with FAX06 MAX06 phantoms 34...
Female and male adult human phantoms, called FASH (Female Adult meSH) MASH (Male meSH), have been developed in the first part of this study using 3D animation software anatomical atlases to replace image-based FAX06 MAX06 voxel phantoms. modelling methods allow for phantom development independent from medical images patients, volunteers or cadavers. The second investigates dosimetric implications organ tissue equivalent doses due differences between new old These are mainly caused by supine...
Computational anthropomorphic human phantoms are useful tools developed for the calculation of absorbed or equivalent dose to radiosensitive organs and tissues body. The problem is, however, that, strictly speaking, results can be applied only a person who has same anatomy as phantom, while with different body mass and/or standing height data could wrong. In order improve this situation many areas in radiological protection, study 18 anthropometric adult phantoms, nine models per gender,...
The purpose of this study was to assess the frequency pediatric CT in 40 less-resourced countries and determine level appropriateness use.Data on increase number examinations during 2007 2009 appropriate use were collected, using standard forms, from 146 facilities at 126 hospitals.The lowest European (4.3%), frequencies Asia (12.2%) Africa (7.8%) twice as high. Head is most common examination children, amounting nearly 75% all examinations. Although regulations many assign radiologists with...
The article reports results from the largest international dose survey in paediatric computed tomography (CT) 32 countries and proposes diagnostic reference levels (DRLs) terms of index (CTDI vol) length product (DLP). It also assesses whether mean or median values individual facilities should be used. A total 6115 patient data were recorded among four age groups: <1 y, >1-5 >5-10 y >10-15 y. CTDIw, CTDI vol DLP CT console dedicated forms together with technical parameters. Statistical...
The aim of this study was to evaluate the radiation doses patients and staff received from first cases prostatic artery embolization (PAE) conducted in a public hospital Recife, Brazil. Five PAE procedures for 5 men diagnosed with benign hyperplasia were investigated. In order characterize patient exposure, dosimetric quantities, such as air kerma-area product (P KA), cumulative kerma at interventional reference point (Ka,r), number images, etc, registered. To possibility deterministic...
The International Commission on Radiological Protection intends to revise the organ and tissue equivalent dose conversion coefficients published in various reports. For this purpose mathematical human medical internal radiation (MIRD) phantoms, actually use, have be replaced by recently developed voxel-based phantoms. This study investigates dosimetric consequences, especially with respect effective male dose, if not only a MIRD phantom is voxel phantom, but also compositions transport codes...
The aim of this study was to evaluate the radiopacity four commercially available low-viscosity composites. lowviscosity composites used in were Natural Flow, Flow It, Filtek and Protect Liner F. Five specimens each material made stainless-steel ring moulds 10 mm diameter 2 height. One specimen a 10-step aluminium wedge radiographed an occlusal film. reading optical density performed five different locations specimen. net calculated, then mean values obtained, related with equivalent...
Abstract Metformin is an antihyperglycemic drug that exhibits some antioxidant properties. HO • ‐induced oxidation of metformin was studied in aqueous solution, both aerated and deaerated conditions. Gamma radiolysis water used to generate free radicals, capable initiating one‐electron metformin. Oxidation end‐products were identified by direct infusion mass spectrometry (MS) high‐performance liquid chromatography/mass (HPLC/MS n ): for every product, structure elucidation based on its...
For the last two decades, organ and tissue equivalent dose as well effective conversion coefficients recommended by International Commission on Radiological Protection (ICRP) have been determined with exposure models based stylized MIRD5-type phantoms representing human body its radiosensitive organs tissues according to ICRP Reference Man released in Publication No. 23, Monte Carlo codes sometimes simulating rather simplified radiation physics compositions from different sources. Meanwhile...