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| 1 | Bone mineral density in cone beam computed tomography:Only a few shades of gray显示文摘Cone beam computed tomography(CBCT) has often been used to determine the quality of craniofacial bone structures through the determination of mineral density, which is based on gray scales of the images obtained. However, there is no consensus regarding the accuracy of the determination of the gray scales in these exams. This study aims to provide a literature review concerning the reliability of CBCT to determine bone mineral density. The gray values obtained with CBCT show a linear relationship with the attenuation coefficients of the materials, Hounsfield Units values obtained with medical computed tomography, and density values from dual energy X-ray absorciometry. However, errors are expected when CBCT images are used to define the quality of the scanned structures be-cause these images show inconsistencies and arbitrari-ness in the gray values, particularly when related to abrupt change in the density of the object, X-ray beam hardening effect, scattered radiation, projection data discontinuity-related effect, differences between CBCTdevices, changes in the volume of the field of view(FOV), and changes in the relationships of size and position between the FOV and the object evaluated. A few methods of mathematical correction of the gray scales in CBCT have been proposed; however, they do not generate consistent values that are independent of the devices and their configurations or of the scanned objects. Thus, CBCT should not be considered the ex-amination of choice for the determination of bone and soft tissue mineral density at the current stage, par-ticularly when values obtained are to be compared to predetermined standard values. Comparisons between symmetrically positioned structures inside the FOV and in relation to the exomass of the object, as it occurs with the right and left sides of the skull, seem to be viable because the effects on the gray scale in the re-gions of interest are the same. | Marcio José da Silva Campos Thainara Salgueiro de Souza Sergio Luiz Mota Júnior Marcelo Reis Fraga Robert Willer Farinazzo Vitral | 2014 | World Journal of Radiology2014，6，8： | 3 |
| 2 | Rheumatoid arthritis: Nuclear medicine state-of-the-art imaging显示文摘Rheumatoid arthritis(RA)is an autoimmune disease,which is associated with systemic and chronic inflammation of the joints,resulting in synovitis and pannus formation.For several decades,the assessment of RA has been limited to conventional radiography,assisting in the diagnosis and monitoring of disease.Nevertheless,conventional radiography has poor sensitivity in the detection of the inflammatory process that happens in the initial stages of RA.In the past years,new drugs that significantly decrease the progression of RA have allowed a more efficient treatment.Nuclear Medicine provides functional assessment of physiological processes and therefore has significant potential for timely diagnosis and adequate follow-up of RA.Several single photon emission computed tomography(SPECT)and positron emission tomography(PET)radiopharmaceuti-cals have been developed and applied in this field.The use of hybrid imaging,which permits computed tomography(CT)and nuclear medicine data to be acquired and fused,has increased even more the diagnostic accuracy of Nuclear Medicine by providing anatomical localization in SPECT/CT and PET/CT studies.More recently,fusion of PET with magnetic resonance imaging(PET/MRI)was introduced in some centers and demonstrated great potential.In this article,we will review studies that have been published using Nuclear Medicine for RA and examine key topics in the area. | Paulo Henrique Rosado-de-Castro Sergio Augusto Lopes de Souza Dangelo Alexandre Lea Mirian Barbosa da Fonseca Bianca Gutfilen | 2014 | World Journal of Orthopedics2014，5，3： | 3 |
| 3 | Miscibility of PVC/PEO blends by viscosimetric,microscopic and thermal analyses显示文摘 | Sergio Mauro da Silva Neiro Douglas Cardoso Dragunski Theng K G | 2000 | European Polymer Journal2000，36，： | 1 |
| 4 | Repopulation of mouse CD4 cells in BALB/c nude mice receiving fetal pig thymus/liver grafts显示文摘 | Zhao Y Sergio JJ Pearson DA | 1997 | Transplant Proc1997，29，2： | 1 |
| 5 | Synthesis of monodisperse poly ( dimethylsiloxane ) micro-and macroemulsions显示文摘 | Sergio Capitao da Silva | 2002 | Langmuir2002，，18： | 1 |
| 6 | Visual Space Perception and Visually Directed Action显示文摘 | Jack M Loomis Naofumi Fujita Josi A Da Silva Sergio S Fukusima | 1992 | Journal of Experimental Psychology:Human Perception and Performance (S0096-1523)1992，18，4： | 1 |
| 7 | Hippocampal mossy fiber sprouting in- duced by forced and voluntary physical exercise 显示文摘 | Michelle Toscano Sergio Gomes da Silva Fulvio Alexan- dre Scorza | 2010 | Physi- ology & Behavior2010，101，2： | 1 |
| 8 | Role of DC-SIGN and L-SIGN receptors in HIV-1 vertical transmission显示文摘 | Ronaldo Celerino da Silva Ludovica Segat Sergio Crovella | 2011 | Human Immunology2011，，4： | 1 |
| 9 | Intrathymic deletion of alloreactive T cells in mixed bone marrow chimeras prepared with a nonmyeloablative conditioning regimen显示文摘 | Manilay JO Pearson DA Sergio JJ | 1998 | Transplantation1998，66，1： | 1 |
| 10 | On the origins of truncated Lévy flights显示文摘 | Annibal Figueiredo Iram Gleria Raul Matsushita Sergio Da Silva | 2003 | Physics Letters A2003，315，： | 1 |
| 11 | Evaluating Brazilian Mutual Funds with Stochastic Frontiers Abstract显示文摘 | Santos Andre Joso Tusi Newton Da Costa Jr Sergio Da Silva | | 0，，13： | 1 |
| 12 | Kras Mutation Analysis of Fine Needle Aspirate Under EUS Guidance Facilitates Risk Stratification of Patients With Pancreatic Mass显示文摘 | Fauze Maluf-Filho Atul Kumar René Gerhardt Márcia Kubrusly Paulo Sakai Fabio Hondo Sergio Eiji Matuguma Everson Artifon José Eduardo Monteiro da Cunha Marcel Cerqueira César Machado Shinichi Ishioka Elias Forero | 2007 | Journal of Clinical Gastroenterology2007，，10： | 1 |
| 13 | Exponentially damped Levy flights,multiscaling and slow convergence in stock markets显示文摘 | Iram Gleria Annibal Figueiredo Raul Matsushita Pushpa Rathie Sergio Da Silva | 2004 | Physica A2004，342，： | 1 |
| 14 | Experimental and numerical modal analysis of 6 cylinders diesel crankshaft显示文摘 | Robson Ferreira da Cruz Sergio Villalva | 2011 | SAE2011，，： | 1 |
| 15 | Spectral analysis informs the proper frequency in the sampling of financial time series data显示文摘 | Cleiton Taufemback Sergio Da Silva | | 0，，： | 1 |
| 16 | Peroxisome proliferator-activated receptors alpha and gamma2 polymorphisms in nonalcoholic fatty liver disease: A study in Brazilian patients显示文摘 | Fernanda Aparecida Domenici Maria José Franco Brochado Ana de Lourdes Candolo Martinelli Sergio Zucoloto Selma Freire de Carvalho da Cunha Helio Vannucchi | 2013 | Gene2013，，： | 1 |
| 17 | Identifying organizational requirements for the implementation of advanced manufacturing technologies (AMT) 显示文摘 | Rafaela da Rosa Cardoso Edson Pinheiro de Lima Sergio E Gouvea da Costa | 2012 | Journal of Manufacturing Systems2012，31，3： | 1 |
| 18 | Unstable angina in patients with left main coronary artery disease acts as a high risk factor for cardiac events, emergency surgery being recommended in these cases显示文摘 | ANTONIO SERGIO CORDEIRO DA ROCKHA PAULO ROBERTO DUTRA DA SILVA | 2003 | Arq Bras Cardiol2003，80，： | 1 |
| 19 | Microstructural features of consecutive layers of Stellite6 deposited by laser cladding显示文摘 | Ana Sofia C M D′Oliveira Paulo Sergio CP da Silva Rui M C Vilar | 2002 | Surface and Coatings Technology2002，153，2： | 1 |
| 20 | Selective identification and quantification of saccharin by liquid chromatography and fluorescence detection显示文摘 | Sergio N.F. Bruno Carlos R. Cardoso Márcia Mosca A. Maciel Lidmila Vokac Ademário I. da Silva Junior | 2014 | Food Chemistry2014，，： | 1 |
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