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Pesquisa : G01.358.500.505.810 [Categoria DeCS]
Referências encontradas : 6593 [refinar]
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[PMID]:28747272
[Au] Autor:Choi IY; Kim PN; Lee SG; Won HJ; Shin YM
[Ad] Endereço:Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Korea.
[Ti] Título:Efficacy and Safety of Radiofrequency Ablation for Focal Hepatic Lesions Adjacent to Gallbladder: Reconfiguration of the Ablation Zone through Probe Relocation and Ablation Time Reduction.
[So] Source:J Vasc Interv Radiol;28(10):1395-1399, 2017 Oct.
[Is] ISSN:1535-7732
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PURPOSE: To evaluate the safety and efficacy of radiofrequency (RF) ablation for treatment of focal hepatic lesions adjacent to the gallbladder with electrode relocation and ablation time reduction. MATERIALS AND METHODS: Thirty-nine patients who underwent RF ablation for focal hepatic lesions adjacent to the gallbladder (≤ 10 mm) were evaluated retrospectively from January 2011 to December 2014 (30 men and 9 women; age range, 51-85 y; mean age, 65 y). Of 36 patients with hepatocellular carcinoma, 3 had a second treatment for recurrence (mean tumor size, 15 mm ± 6). Patients were divided into 2 subgroups based on lesion distance from the gallbladder: nonabutting (> 5 mm; n = 19) and abutting (≤ 5 mm; n = 20). Electrodes were inserted parallel to the gallbladder through the center of a tumor in the nonabutting group and through the center of the expected ablation zone between a 5-mm safety zone on the liver side and the gallbladder in the abutting group. Ablation time was decreased in proportion to the transverse diameter of the expected ablation zone. RESULTS: Technical success and technical effectiveness rates were 89.7% and 97.4%, respectively, with no significant differences between groups (P = 1.00). Local tumor progression was observed in 3 patients (1 in the nonabutting group and 2 in the abutting group; P = 1.00). There were no major complications. The gallbladder was thickened in 10 patients, with no significant difference between groups (P = .72). Biloma occurred in 1 patient in the nonabutting group. CONCLUSIONS: RF ablation with electrode relocation and reduction of ablation time can be a safe and effective treatment for focal hepatic lesions adjacent to the gallbladder.
[Mh] Termos MeSH primário: Carcinoma Hepatocelular/cirurgia
Ablação por Cateter/métodos
Vesícula Biliar/lesões
Neoplasias Hepáticas/cirurgia
[Mh] Termos MeSH secundário: Idoso
Idoso de 80 Anos ou mais
Progressão da Doença
Segurança de Equipamentos
Feminino
Seres Humanos
Masculino
Meia-Idade
Duração da Cirurgia
Segurança do Paciente
Ondas de Rádio
Estudos Retrospectivos
Resultado do Tratamento
Ultrassonografia de Intervenção
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180220
[Lr] Data última revisão:
180220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170728
[St] Status:MEDLINE


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[PMID]:29324794
[Au] Autor:Zimbelman EG; Keefe RF
[Ad] Endereço:Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID, United States of America.
[Ti] Título:Real-time positioning in logging: Effects of forest stand characteristics, topography, and line-of-sight obstructions on GNSS-RF transponder accuracy and radio signal propagation.
[So] Source:PLoS One;13(1):e0191017, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Real-time positioning on mobile devices using global navigation satellite system (GNSS) technology paired with radio frequency (RF) transmission (GNSS-RF) may help to improve safety on logging operations by increasing situational awareness. However, GNSS positional accuracy for ground workers in motion may be reduced by multipath error, satellite signal obstruction, or other factors. Radio propagation of GNSS locations may also be impacted due to line-of-sight (LOS) obstruction in remote, forested areas. The objective of this study was to characterize the effects of forest stand characteristics, topography, and other LOS obstructions on the GNSS accuracy and radio signal propagation quality of multiple Raveon Atlas PT GNSS-RF transponders functioning as a network in a range of forest conditions. Because most previous research with GNSS in forestry has focused on stationary units, we chose to analyze units in motion by evaluating the time-to-signal accuracy of geofence crossings in 21 randomly-selected stands on the University of Idaho Experimental Forest. Specifically, we studied the effects of forest stand characteristics, topography, and LOS obstructions on (1) the odds of missed GNSS-RF signals, (2) the root mean squared error (RMSE) of Atlas PTs, and (3) the time-to-signal accuracy of safety geofence crossings in forested environments. Mixed-effects models used to analyze the data showed that stand characteristics, topography, and obstructions in the LOS affected the odds of missed radio signals while stand variables alone affected RMSE. Both stand characteristics and topography affected the accuracy of geofence alerts.
[Mh] Termos MeSH primário: Florestas
Ondas de Rádio
Comunicações Via Satélite
[Mh] Termos MeSH secundário: Agricultura Florestal
Sistemas de Informação Geográfica
Seres Humanos
Idaho
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, N.I.H., EXTRAMURAL
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180215
[Lr] Data última revisão:
180215
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180112
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191017


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[PMID]:29244941
[Au] Autor:Ivanov YD; Malsagova KA; Pleshakova TO; Vesnin SG; Tatur VY; Yarygin KN
[Ti] Título:Monitoring of brightness temperature of suspension of follicular thyroid carcinoma cells in SHF range by radiothermometry.
[So] Source:Patol Fiziol Eksp Ter;60(4):174-7, 2016 Oct-Dec.
[Is] ISSN:0031-2991
[Cp] País de publicação:Russia (Federation)
[La] Idioma:eng
[Ab] Resumo:The purpose: The purpose of this research consisted in monitoring of brightness temperature of the suspension of follicular thyroid carcinoma cells during the necrosis of these cells in superhigh frequency (SHF) range. Methods: The monitoring of the change in the ratio between brightness temperatures TSHF and TIR values during the necrosis of these cells. The object of study was follicular thyroid carcinoma cells suspension prepared with use of Versene solution and 0.25% trypsin solution. The cells were precipitated by centrifugation and re-suspended in culture medium. The measurements of brightness temperatures were carried out with use of radiothermoimeter. SHF range was 3.4-4.2 GHz, and infrared (IR) range was 8-13 mm. The temperature of the suspension was maintained at 37.5°Ð¡. Results: It was found that upon the necrosis in the suspension of cells, an increase in brightness temperature in 3.4-4.2 GHz range (SHF range) occurs, while brightness temperature of the medium in the IR range does not change. Conclusion: The monitoring of necrosis of follicular thyroid carcinoma cells was carried out by SHF-radiothermometry. It was shown that during the necrosis the change of non-equilibrium state of cell medium occurs, that results in the change in the ratio between TSHF and TIR. During the necrosis, the brightness temperature in SHF range (TSHF) increases.
[Mh] Termos MeSH primário: Adenocarcinoma Folicular/metabolismo
Adenocarcinoma Folicular/patologia
Ondas de Rádio
Termometria/métodos
Neoplasias da Glândula Tireoide/metabolismo
Neoplasias da Glândula Tireoide/patologia
[Mh] Termos MeSH secundário: Linhagem Celular Tumoral
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180118
[Lr] Data última revisão:
180118
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171216
[St] Status:MEDLINE


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[PMID]:29244915
[Au] Autor:Ivanov YD; Malsagova KA; Tatur VY; Vesnin SG; Ivanova ND; Ziborov VS
[Ti] Título:SHF radiation from albumin solution upon external excitation.
[So] Source:Patol Fiziol Eksp Ter;60(3):101-4, 2016 Jul-Sep.
[Is] ISSN:0031-2991
[Cp] País de publicação:Russia (Federation)
[La] Idioma:eng
[Ab] Resumo:The purpose of the research consisted in the measurement of nonequilibrium radiation in superhigh frequency (SHF) range from aqueous solution of albumin upon its mechanical stimulation. Methods: the monitoring of change in the ratio between brightness temperatures TSHF and TIR values after the mechanical stimulation of aqueous solution of albumin in the measuring cell at 35-39°Ð¡. The measurements of brightness temperatures were carried out with use of radiothermometer. SHF frequency range corresponded to 3.4-4.2 GHz, SHF frequency range corresponded to 8-13 mm. Results: It was found that mechanical stimulation of aqueous solution of albumin at the temperature ~39°Ð¡, the change in the ratio between TSHF and TIR occurs. This corresponds to emergence of nonequilibrium SHF radiation from the solution near the phase transition with ~39°Ð¡ temperature. Conclusion: The effect of emergence of nonequilibrium SHF radiation from protein solution near its temperature 39°Ð¡ was found. This temperature corresponds to the temperature of human organism upon a number of pathological states connected with inflammatory processes. The discovered effect can be used in the development of novel non-invasive methods of disease diagnostics.
[Mh] Termos MeSH primário: Albuminas/química
Ondas de Rádio
[Mh] Termos MeSH secundário: Temperatura Alta
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Albumins)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180118
[Lr] Data última revisão:
180118
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171216
[St] Status:MEDLINE


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[PMID]:28585268
[Au] Autor:Zhang Z; Guo C; Gao T; Fu H; Chen Q; Wang Y
[Ad] Endereço:College of Food Science & Engineering, Northwest A&F University, Yangling, Shaanxi, China.
[Ti] Título:Pilot-scale radiofrequency blanching of potato cuboids: heating uniformity.
[So] Source:J Sci Food Agric;98(1):312-320, 2018 Jan.
[Is] ISSN:1097-0010
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Traditional hot water blanching has a slow heat transfer rate, whereas radiofrequency (RF) heating has the advantages of a much faster heating rate and a higher penetration depth. In the present study, RF heating was applied to improve heating uniformity for subsequent blanching experiments involving potato cuboids. Potato cuboids were treated in a pilot-scale, RF heating system (27.12 MHz, 6 kW) under different operating conditions. RESULTS: The dielectric constant increased first and then decreased with temperature, whereas the loss factor increased as the temperature increased. The results of the present study reveal that the electrode gap, sample height and NaCl solution had significant effects (P < 0.05) on the temperature distribution and heating uniformity of the sample after RF heating. The optimum RF heating uniformity was obtained at an electrode gap of 120 mm, a sample height of 60 mm and when immersed in NaCl solution of 0.5 s m . The central heating pattern was presented in a sample. Cold spots were located at the edge of the top surface of the sample. CONCLUSION: The present study shows the great potential of RF heating for the blanching of vegetables. Future studies should aim to determine changes in the texture and nutrient contents of vegetables during RF heating. © 2017 Society of Chemical Industry.
[Mh] Termos MeSH primário: Tubérculos/efeitos da radiação
Solanum tuberosum/efeitos da radiação
[Mh] Termos MeSH secundário: Manipulação de Alimentos
Temperatura Alta
Tubérculos/química
Ondas de Rádio
Solanum tuberosum/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171228
[Lr] Data última revisão:
171228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170607
[St] Status:MEDLINE
[do] DOI:10.1002/jsfa.8473


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[PMID]:29269461
[Au] Autor:Dalton CA
[Ad] Endereço:Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI, USA. colleen_dalton@brown.edu.
[Ti] Título:How seismic waves lose energy.
[So] Source:Science;358(6370):1536-1537, 2017 12 22.
[Is] ISSN:1095-9203
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Fenômenos Eletromagnéticos
Fenômenos Físicos
[Mh] Termos MeSH secundário: Acústica
Ondas de Rádio
Ondas de Maré
Vibração
[Pt] Tipo de publicação:JOURNAL ARTICLE; COMMENT
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171227
[Lr] Data última revisão:
171227
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171223
[St] Status:MEDLINE
[do] DOI:10.1126/science.aar2748


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[PMID]:29234803
[Au] Autor:Maas E; Juch J; Huygen F
[Ad] Endereço:Department of Health Sciences, VU University Amsterdam, Amsterdam, the Netherlands.
[Ti] Título:Radiofrequency Denervation for Chronic Low Back Pain-Reply.
[So] Source:JAMA;318(22):2256-2257, 2017 12 12.
[Is] ISSN:1538-3598
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Denervação
Dor Lombar/cirurgia
[Mh] Termos MeSH secundário: Seres Humanos
Vértebras Lombares
Ondas de Rádio
Resultado do Tratamento
Articulação Zigapofisária
[Pt] Tipo de publicação:LETTER; COMMENT
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171215
[Lr] Data última revisão:
171215
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:171214
[St] Status:MEDLINE
[do] DOI:10.1001/jama.2017.16390


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[PMID]:29234800
[Au] Autor:Vorobeychik Y; Stojanovic MP; McCormick ZL
[Ad] Endereço:Department of Anesthesiology, Penn State Milton S. Hershey Medical Center, Hershey, Pennsylvania.
[Ti] Título:Radiofrequency Denervation for Chronic Low Back Pain.
[So] Source:JAMA;318(22):2254-2255, 2017 12 12.
[Is] ISSN:1538-3598
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Denervação
Dor Lombar/cirurgia
[Mh] Termos MeSH secundário: Dor nas Costas/cirurgia
Seres Humanos
Vértebras Lombares
Ondas de Rádio
Resultado do Tratamento
Articulação Zigapofisária
[Pt] Tipo de publicação:LETTER; COMMENT
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171215
[Lr] Data última revisão:
171215
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:171214
[St] Status:MEDLINE
[do] DOI:10.1001/jama.2017.16386


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[PMID]:29234799
[Au] Autor:Kao MC; Leong MS; Mackey S
[Ad] Endereço:Department of Anesthesiology, Stanford University, Stanford, California.
[Ti] Título:Radiofrequency Denervation for Chronic Low Back Pain.
[So] Source:JAMA;318(22):2256, 2017 12 12.
[Is] ISSN:1538-3598
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Denervação
Dor Lombar/cirurgia
[Mh] Termos MeSH secundário: Dor nas Costas/cirurgia
Seres Humanos
Vértebras Lombares
Ondas de Rádio
Resultado do Tratamento
Articulação Zigapofisária
[Pt] Tipo de publicação:LETTER; COMMENT
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171215
[Lr] Data última revisão:
171215
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:171214
[St] Status:MEDLINE
[do] DOI:10.1001/jama.2017.16382


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[PMID]:29234798
[Au] Autor:Rimmalapudi V; Buchalter J; Calodney A
[Ad] Endereço:Gulf Coast Pain Institute, Pensacola, Florida.
[Ti] Título:Radiofrequency Denervation for Chronic Low Back Pain.
[So] Source:JAMA;318(22):2255-2256, 2017 12 12.
[Is] ISSN:1538-3598
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Denervação
Dor Lombar/cirurgia
[Mh] Termos MeSH secundário: Dor nas Costas/cirurgia
Seres Humanos
Vértebras Lombares
Ondas de Rádio
Resultado do Tratamento
Articulação Zigapofisária
[Pt] Tipo de publicação:LETTER; COMMENT
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171215
[Lr] Data última revisão:
171215
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:171214
[St] Status:MEDLINE
[do] DOI:10.1001/jama.2017.16378



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