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ABFM NEWS - Radioterapia
 
Randomized Comparison of Whole Brain Radiotherapy, 20 Gy in Four Daily Fractions Versus 40 Gy in 20 Twice-Daily Fractions, for Brain Metastases
 
"Purpose The present study compared the intracranial control rate and quality of life for two radiation fractionation schemes for cerebral metastases. " [+ leia mais]
Fonte: Int J of Radiation Oncology, Biology, Physics
 
 
Uncertainties in IMRT dosimetry
 
Purpose: The purpose of this study is to investigate some characteristics of the beam delivery system and their effects on the dose distribution of intensity-modulated radiation therapy (IMRT) and the results of patient-specific IMRT quality assurance (QA). [+ leia mais]
Fonte: Medical Physics
 
 
Análise da influência das variações dos parâmetros de controle de qualidade na determinação da dose absorvida em água
 
"Resumo A condição de referência estabelecida para determinação da dose absorvida em água, segundo o TRS-398, depende de alguns parâmetros eletro-mecânicos do acelerador linear. Assim, em princípio, incertezas na definição desses parâmetros podem ocasionar variação na dosimetria da máquina." [+ leia mais]
Fonte: RBFM
 
 
A field size specific backscatter correction algorithm for accurate EPID dosimetry
 
Purpose: Portal dose images acquired with an amorphous silicon electronic portal imaging device (EPID) suffer from artifacts related to backscattered radiation. The backscatter signal varies as a function of field size (FS) and location on the EPID. [+ leia mais]
Fonte: Medical Physics
 
 
Investigation of three radiation detectors for accurate measurement of absorbed dose in nonstandard fields
 
Purpose: To establish accurate experimental dosimetry techniques for reference dose measurements in nonstandard composite fields. [+ leia mais]
Fonte: Medical Physics
 
 
Patient doses and projection angle in cone beam CT
 
Purpose: To investigate how x-ray tube projection angle affects organ and effective doses to patients undergoing a CT examination on a cone beam scanner. [+ leia mais]
Fonte: Medical Physics
 
 
On the implementation of a recently proposed dosimetric formalism to a robotic radiosurgery system
 
Purpose: The aim of this work is to implement a recently proposed dosimetric formalism for nonstandard fields to the calibration and small field output factor measurement of a robotic stereotactic radiosurgery system. [+ leia mais]
Fonte: Medical Physics
 
 
Dose-rate effects in external beam radiotherapy redux
 
"Abstract Recent developments in external beam radiotherapy, both in technical advances and in clinical approaches, have prompted renewed discussions on the potential influence of dose-rate on radio-response in certain treatment scenarios." [+ leia mais]
Fonte: Radiotherapy and Oncology
 
 
The management of radiation treatment error through incident learning
 
"Purpose To assess efficacy of an incident learning system in the management of error in radiation treatment." [+ leia mais]
Fonte: Radiotherapy and Oncology
 
 
IMRT can be faster to deliver than conformal radiotherapy
 
"To the Editor, Van der Werf et al. [1] E. Van der Werf, Y. Lievens, J. Verstraete, K. Pauwels and W. Van den Bogaert, Time and motion study of radiotherapy delivery: economic burden of increased quality assurance and IMRT, Radiother Oncol 93 (2009), pp. 137–140.[1] present some interesting and informative data concerning the treatment timing, and cost, of IMRT compared to those of conformal radiotherapy. Across the United Kingdom (UK), IMRT has been implemented relatively sparsely, partly because of concerns about the in-room treatment delivery time on the linac. " [+ leia mais]
Fonte: Radiotherapy and Oncology
 
 
Brushed permanent magnet DC MLC motor operation in an external magnetic field
 
Purpose: Linac-MR systems for real-time image-guided radiotherapy will utilize the multileaf collimators (MLCs) to perform conformal radiotherapy and tumor tracking. [+ leia mais]
Fonte: Medical Physics
 
 
Automated beam model optimization
 
The beam model in a three dimensional treatment planning system (TPS) defines virtually the mechanical and dosimetric characteristics of a treatment unit. [+ leia mais]
Fonte: Medical Physics
 
 
Analysis of dose–volume histogram parameters for radiation pneumonitis after definitive concurrent chemoradiotherapy for esophageal cancer
 
"Purpose To evaluate dose–volume histogram (DVH) parameters as predictors of radiation pneumonitis (RP) in esophageal cancer patients treated with definitive concurrent chemoradiotherapy. " [+ leia mais]
Fonte: Radiotherapy and Oncology
 
 
IMRT can be faster to deliver than conformal radiotherapy
 
"To the Editor, Van der Werf et al. [1] present some interesting and informative data concerning the treatment timing, and cost, of IMRT compared to those of conformal radiotherapy. " [+ leia mais]
Fonte: Radiotherapy and Oncology
 
 
Transístor óptico quântico usa transparência induzida por luz
 
Em uma pesquisa inédita, com participação de um cientista brasileiro, uma equipe do Instituto Max Planck, na Alemanha, criou um transístor óptico quântico, formado por um único átomo e acionado exclusivamente por luz. [+ leia mais]
Fonte: Inovação Tecnológica
 
 
Evaluation of a fast method of EPID-based dosimetry for intensity-modulated radiation therapy
 
"Abstract Electronic portal imaging devices (EPIDs) could potentially be useful for intensity-modulated radiation therapy (IMRT) QA." [+ leia mais]
Colaborador: Fábio Strina Juliasz
Fonte: Journal of Applied Clinical Medical Physics
 
 
High-precision GAFCHROMIC EBT film-based absolute clinical dosimetry using a standard flatbed scanner without the use of a scanner non-uniformity corr
 
"Abstract To report a study of the use of GAFCHROMIC EBT radiochromic film (RCF) digitized with a commercially available flatbed document scanner for accurate and reliable all-purpose two-dimensional (2D) absolute dosimetry within a clinical environment." [+ leia mais]
Colaborador: Fábio Strina Juliasz
Fonte: Journal of Applied Clinical Medical Physics
 
 
Evaluation of fluence-smoothing feature for three IMRT planning systems
 
"Abstract Commercially available intensity-modulated radiation therapy (IMRT) inverse treatment planning systems (ITPS) typically include a smoothing function which allows the user to vary the complexity of delivered beam fluence patterns." [+ leia mais]
Colaborador: Fábio Strina Juliasz
Fonte: Journal of Applied Clinical Medical Physics
 
 
Descoberto o mais antigo aglomerado de galáxias, com 9,6 bilhões de anos
 
"Uma equipe internacional de astrônomos anuncia ter localizado o mais antigo aglomerado de galáxias já encontrado, a 9,6 bilhões de anos-luz da Terra. A luz das galáxias antigas foi detectada por meio de um espectrógrafo de infravermelho. A descoberta é descrita na revista especializada Astrophysical Journal Letters. " [+ leia mais]
Fonte: Folha
 
 
Comparison of Methods to Reduce Dose to Swallowing-Related Structures in Head and Neck Cancer
 
"Introduction Emerging data suggest that reduction of dose to the larynx and pharyngeal constrictor may lower the risk of swallowing complications such as long-term gastrostomy dependence and aspiration. Organ avoidance becomes difficult when the primary tumor or involved nodes are present at the level of the larynx. " [+ leia mais]
Fonte: Int J of Radiation Oncology Biology Physics
 
 
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