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Paleolithic Humans Had Bread Along With Their Meat
 
"LONDON (Reuters) — Starch grains found on 30,000-year-old grinding stones suggest that prehistoric humans may have dined on an early form of flatbread, contrary to their popular image as primarily meat eaters. " [+ leia mais]
Fonte: Times
 
 
Agency Will Not Ask Israel to Sign Nuclear Nonproliferation Treaty
 
"The United Nations nuclear watchdog narrowly rejected an Arab-sponsored resolution Friday calling on Israel to join the nuclear Non-Proliferation Treaty. " [+ leia mais]
Fonte: Times
 
 
Software OIEA TECDOC 1517. MAMOGRAFIA
 
Se presenta Software sobre Control de Calidad en Mamografía (TECDOC 1517) en el VIII Congreso Regional de Seguridad Radiologica y Nuclear: [+ leia mais]
Colaborador: Camila de Sales
Fonte: www.acpr.org.co
 
 
Hubble fotografa nebulosa planetária a 6.500 anos-luz
 
"A Nasa divulga nesta segunda-feira uma imagem feita pelo Telescópio Espacial Hubble da nebulosa planetária NGC 6210. Localizada a 6.500 anos-luz da Terra, na constelação de Hércules, a nebulosa foi descoberta em 1825 pelo alemão Friedrich Georg Wilhelm Struve. " [+ leia mais]
Colaborador: Camila de Sales
Fonte: Estadão
 
 
Instituto do Câncer e HC têm inscrição para mutirão de mamografia de 18 a 29
 
"SÃO PAULO - O Instituto do Câncer do Estado de São Paulo Octavio Frias de Oliveira e o Instituto de Radiologia (Inrad) do Hospital das Clínicas (HC) da FMUSP, ligados à Secretaria de Estado da Saúde, realizam entre os dias 18 e 29 um mutirão de mamografia. A iniciativa, gratuita e aberta à população, pretende atender cerca de 600 mulheres da capital paulista. " [+ leia mais]
Colaborador: Camila de Sales
Fonte: Estadão
 
 
Tecnologia da Nasa será usada em exames e pode ajudar em diagnósticos
 
"WASHINGTON - A avançada tecnologia da Agência Espacial Americana (Nasa) aplicada à medicina criou um sistema que ajudará a interpretar com mais precisão exames médicos, algo que pode ser vital para o diagnóstico de doenças como o câncer, segundo a empresa Bartron Medical Imaging. " [+ leia mais]
Colaborador: Camila de Sales
Fonte: Estadão
 
 
17. LHC está entrando em região nunca antes explorada
 
"Pesquisadores brasileiros contam experiências do acelerador de partículas O projeto do maior instrumento científico já construído, o acelerador de partículas LHC (Large Hadron Collider, ou grande colisor de hádrons) conta com a participação de diversos pesquisadores brasileiros. Segundo eles, apesar de ainda estar em uma fase inicial, o acelerador já teve resultados surpreendentes e está entrando num campo nunca antes investigado na prática. ""É uma região de energia que a gente nunca explorou em laboratório. Nós nunca fizemos esses tipos de reações em condições controladas. E o fato de a gente conseguir fazer isso já é um grande feito, já é uma grande conquista"", diz Jun Takahashi, professor do Instituto de Física Gleb Wataghin, da Universidade Estadual de Campinas (Unicamp). " [+ leia mais]
Colaborador: Camila de Sales
Fonte: Jonal da Ciência
 
 
Curso de Radioterapia Estro " From 2D to 3D Radiotherapy"
 
"Estro, Curso de Radioterapia. Bogotá - Colômbia 30 de Janeiro à 03 de Fevereiro de 2011" [+ leia mais]
Colaborador: Cecília Haddad
Fonte: www.estro-education.org
 
 
Low molecular weight heat shock protein HSP27 is a prognostic indicator in rectal cancer but not colon cancer
 
"Objective There are currently no biomarkers in routine clinical use for determining prognosis in rectal cancer. In a preliminary proteomic study, variation in the levels of heat shock protein 27 (HSP27) in colorectal cancer samples was observed. The expression of HSP27 in a cohort of 404 patients with colorectal cancer with a predominantly poor prognosis was characterised and an investigation was undertaken of whether the differences were related to clinical outcome. HSP27 levels in diagnostic rectal biopsies were compared with matched surgical samples to determine whether changes in expression occurred in the time between biopsy and surgery and to investigate whether preoperative radiotherapy affected expression. Finally, the relationship between HSP27 expression and outcome was examined in an independent cohort of 315 patients with a predominantly good prognosis. Methods HSP27 levels were determined using combined two-dimensional gel electrophoresis and tandem mass spectrometry (12 cases) and by immunohistochemistry using tissue microarrays of colorectal cancers sampled at surgery and 80 diagnostic rectal biopsies. Results HSP27 overexpression was strongly associated with poor cancer-specific survival in rectal cancer (n=205, p=0.0063) but not colon cancer (n=199, p=0.7385) in the cohort with a poor prognosis. Multivariate Cox regression confirmed nodal metastases (p=0.0001) and HSP27 expression (p=0.0233) as independent markers of survival in rectal cancer. HSP27 levels remained unchanged in the majority of cases (65/80, 81%) between diagnostic biopsies and matched surgical samples, regardless of whether patients had undergone preoperative radiotherapy. In the cohort with a good prognosis the association between HSP27 and survival was not observed in patients with either rectal (n=115; p=0.308) or colon cancer (n=200; p=0.713). Conclusion In a large cohort of patients with a poor prognosis, HSP27 is an independent marker of poor outcome in rectal cancer; its expression is not altered by neoadjuvant radiotherapy. This finding requires validation in an independent similar cohort of patients with rectal cancer. HSP27 levels merit evaluation as a stratification factor for treatment of rectal cancer. " [+ leia mais]
Fonte: GUT An Int. J. of Gastroenterology and Hepatology
 
 
A radiotherapy planning study of RapidArc, intensity modulated radiotherapy, three-dimensional conformal radiotherapy, and parallel opposed beams in t
 
"Abstract BACKGROUND: This planning study compared RapidArc, fixed-field IMRT (cIMRT), 3D conformal radiotherapy (3D-CRT), and a parallel-opposed pair (POP) for children with retroperitoneal tumors. PROCEDURE: Plans were generated in eight patients to treat the PTV (dose range 19.8-45 Gy) while limiting kidney and liver doses. In selected patients, vertebral body (VB) dose heterogeneity was minimized. Cumulative DVH parameters, monitor units (MU), and treatment times were compared for the four techniques using the Wilcoxon matched pairs test. RESULTS: RapidArc and cIMRT covered target volumes more conformally than 3D-CRT and POP (P = 0.012). There was no difference in the ability to meet kidney dose constraints. A significantly lower volume of the liver received 12 Gy with cIMRT or RapidArc compared with 3D-CRT (P = 0.028). Where VB was included in PTV, VB dose homogeneity was generally within 94-104% of the prescription dose. Time to deliver a single fraction with RapidArc, POP, 3D-CRT, and cIMRT was 1.25 ± 0.01, 1.38 ± 0.10, 2.6 ± 0.45, and 4.02 ± 1.12 min, respectively (P = 0.012). Monitor units for a single fraction with POP, 3D-CRT, RapidArc, and cIMRT were 203 ± 26, 235 ± 32, 325 ± 71, and 665 ± 215, respectively (P < 0.05). CONCLUSIONS: POP resulted in favorable MU, treatment time and dosimetry but had poor conformality. 3D-CRT was more conformal but had higher MU and treatment time. RapidArc and cIMRT were generally no better dosimetrically than conformal techniques. RapidArc was dosimetrically very similar to cIMRT, but resulted in a major reduction in time and MU used to deliver the radiation. Pediatr Blood Cancer. " [+ leia mais]
Fonte: Pediatric Blood & Cancer
 
 
Large volume unresectable locally advanced non-small cell lung cancer: acute toxicity and initial outcome results with Rapid Arc
 
"Background To report acute toxicity, initial outcome results and planning therapeutic parameters in radiation treatment of advanced lung cancer (stage III) with volumetric modulated arcs using RapidArc (RA). Methods Twenty-four consecutive patients were treated with RA. All showed locally advanced non-small cell lung cancer with stage IIIA-IIIB and with large volumes (GTV:299+/-175cm3, PTV:818+/-206cm3). Dose prescription was 66Gy in 33 fractions to mean PTV. Delivery was performed with two partial arcs with a 6MV photon beam. Results From a dosimetric point of view, RA allowed us to respect most planning objectives on target volumes and organs at risk. In particular: for GTV D1%=105.6+/-1.7%, D99%=96.7+/-1.8%, D5%-D95%=6.3+/-1.4%; contra-lateral lung mean dose resulted in 13.7+/-3.9Gy, for spinal cord D1%=39.5+/-4.0Gy, for heart V45Gy=9.0+/-7.0Gy, for esophagus D1%=67.4+/-2.2Gy. Delivery time was 133+/-7s. At three months partial remission >50% was observed in 56% of patients. Acute toxicities at 3 months showed 91% with grade 1 and 9% with grade 2 esophageal toxicity; 18% presented grade 1 and 9% with grade 2 pneumonia; no grade 3 acute toxicity was observed. The short follow-up does not allow assessment of local control and progression free survival. Conclusions RA proved to be a safe and advantageous treatment modality for NSCLC with large volumes. Long term observation of patients is needed to assess outcome and late toxicity. " [+ leia mais]
Fonte: Radiation Oncology
 
 
Inca recomenda que resultado de mamografia saia em até 60 dias
 
"Instituto deu novas recomendações sobre câncer de mama. Mulheres entre 50 e 69 anos devem fazer exame a cada dois anos. " [+ leia mais]
Colaborador: Cássio V. Komatsu
 
 
AAPM POSTS CT PROTOCOLS ON ITS WEBSITE
 
"AAPM POSTS CT PROTOCOLS ON ITS WEBSITE In response to concerns regarding the safe and effective use of CT imaging, the AAPM has begun to post on its website scan protocols for frequently performed CT examinations. These protocols will summarize the basic requirements of the exams, and provide several model-specific examples of scan and reconstruction parameters that are considered by the Working Group to be reasonable and appropriate to the specified diagnostic task. The first protocol posted by the Working Group on Standardization of CT Nomenclature and Protocols , whose membership includes academic and consulting medical physicists who specialize in CT imaging, representatives of each of the major CT scanner manufacturers, and liaisons to the ACR, ASRT, and the FDA, is for adult CT brain perfusion studies. Others will follow as they are developed. The protocols may be accessed here . It is our hope that these resources will help AAPM members as they work to ensure the safe and effective use of CT imaging. " [+ leia mais]
Colaborador: Laura Natal
Fonte: AAPM
 
 
New IOMP website
 
"Dear Colleagues, I am happy to inform you that the IOMP website (www.iomp.org) has been updated with new look and feel. We hope to start a number of new functionalities in near future. The new website uses modern web content management system and will provide flexibility of operation and thus increase efficiency for updates. We welcome your feedback and continued support. Kindest regards Madan " [+ leia mais]
Colaborador: Laura Natal
 
 
Stand Educacional durante o Congresso da SBRT - VARIAN
 
"Varian, promovendo o conhecimento, oferecendo soluções e benefícios clínicos. Visite o stand Educacional da Varian, e aproveite para conhecer um pouco mais sobre os nossos produtos. Participe de sessões especiais, esclarecendo suas dúvidas ou recebendo demonstrações: - Eclipse - RapidArc - Aria - Braquiterapia com Acuros ( Cáculo de Monte Carlo) Agende um horário com nossos especialistas, retornando este e-mail com seu nome e telefone, ou se preferir, ligue para 11.3457-2655 Nos vemos em breve em Campinas! Varian Medical Systems " [+ leia mais]
Colaborador: Tatiana Reis
Fonte: VARIAN
 
 
ICRP SYMPOSIUM ON THE INTERNATIONAL SYSTEM OF RADIOLOGICAL PROTECTION
 
The International Commission on Radiological Protection (ICRP), an independent organisation that issues recommendations on protection against ionizing radiation, will hold its next meeting together with its standing Committees in North Bethesda, Maryland, USA, in October 2011. [+ leia mais]
Fonte: ICRP
 
 
ICRP - 2009 Annual Report
 
ICRP 2009 Annual Report Now Available [+ leia mais]
Fonte: ICRP
 
 
Armazenamento magneto-óptico de dados alcança faixa dos petabits
 
As pesquisas em busca da próxima geração de dispositivos de armazenamento magneto-ópticos alcançou a densidade de 6 petabits, ou 6.000 terabits, ou ainda 6 milhões de gigabits [+ leia mais]
Fonte: Inovação Tecnológica
 
 
Cientistas criam leitor de elétrons individuais
 
"Culminando um esforço de 10 anos de pesquisas, um grupo de engenheiros e físicos da Universidade de Nova Gales do Sul, na Austrália, criou um dos principais componentes necessários para viabilizar um computador quântico baseado no silício. " [+ leia mais]
Fonte: Inovação Tecnológica
 
 
Reference Data for the Validation of Doses from Cosmic-Radiation Exposure of Aircraft Crew
 
"Aircraft crews are exposed to elevated levels of cosmic radiation of galactic and solar origins and secondary raiations produced in the atmosphere, the aircraft, and its contents. Th ICRP has recommended that exposures of aircraft crew to cosmic radiation in the operation of commercial jet aircraft be included as occupational exposure. " [+ leia mais]
Fonte: ICRU
 
 
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