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ABFM NEWS - Radioterapia
 
Effect of Contrast Media on Megavoltage Photon Beam Dosimetry .
 
The purpose of this study was to quantify changes in photon beam dosimetry caused by using contrast media during computed tomography (CT) simulation and determine if the resulting changes are clinically significant. The effect of contrast on dosimetry was first examined for a single 6-MV photon beam... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Medical Dosimetry.
 
 
Hypofractionated, palliative radiotherapy for advanced head and neck cancer.
 
A significant proportion of advanced stage head and neck cancer patients are incurable and have a limited life expectancy. This study reports a single institution experience with a hypofractionated radiotherapy regimen for palliation of loco-regionally advanced and incurable HNSCC... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Chamber-quality factors in 60Co for three plane-parallel chambers for the dosimetry of electrons, protons and heavier charged particles: PENELOPE...
 
"The IBA-Scanditronix NACP-02, IBA-Wellhofer PPC-40 and PPC-05 planeparallel ionization chambers have been simulated with the Monte Carlo code PENELOPE to obtain their chamber- and quality-dependent factors fc,Qo for a 60Co gamma beam..." [+ leia mais]
Colaborador: Laura Natal Rodrigues.
Fonte: Physics in Medicine and Biology.
 
 
Peripheral dose measurements for 6 and 18 MV photon beams on a linear accelerator with multileaf collimator.
 
Peripheral dose (PD) to critical structures outside treatment volume is of clinical importance. The aim of the current study was to estimate PD on a linear accelerator equipped with multileaf collimator (MLC)... [+ leia mais]
Fonte: Medical Physics.
 
 
Technical Note: On Cerrobend shielding for 18–22 MeV electron beams.
 
The purpose of this study is to investigate the depth at which the measurement of the block transmission factor should be made, and the level of the transmission of 18 and 22 MeV electron beams through conventional Cerrobend... [+ leia mais]
Fonte: Medical Physics.
 
 
The effect of amifostine or IMRT to preserve the parotid function after radiotherapy of the head and neck region measured by quantitative salivary...
 
In this retrospective study, two approaches to preserve the parotid function after radiotherapy (RT) were compared: application of the radioprotective agent amifostine during RT and parotid-sparing intensity-modulated radiotherapy (IMRT)... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Four-dimensional CT analysis of vocal cords mobility for highly focused single vocal cord irradiation.
 
"To quantify respiratory motion of the vocal cords during normal respiration using 4D-CT. The final goal is to develop a technique for single vocal cord irradiation (SVCI) in early glottic carcinoma. Sparing the non-involved cord and surrounding structures has the potential to preserve voice quality and allow re-irradiation of recurrent and second primary tumors... " [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Dosimetric characteristics of Novalis Tx system with high definition multileaf collimator.
 
A new Novalis Tx system equipped with a high definition multileaf collimator (HDMLC) recently became available to perform both image-guided radiosurgery and conventional radiotherapy... [+ leia mais]
Fonte: Medical Physics.
 
 
Statistical process control for IMRT dosimetric verification.
 
Patient-specific measurements are typically used to validate the dosimetry of intensity-modulated radiotherapy (IMRT). To evaluate the dosimetric performance over time of our IMRT process, we have used statistical process control (SPC) concepts to analyze the measurements from 330 head and neck (H&N) treatment plans... [+ leia mais]
Fonte: Medical Physics.
 
 
Evaluation of geometric changes of parotid glands during head and neck cancer radiotherapy using daily MVCT and automatic deformable registration.
 
To assess and evaluate geometrical changes in parotid glands using deformable image registration and megavoltage CT (MVCT) images... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Comparison of 12 deformable registration strategies in adaptive radiation therapy for the treatment of head and neck tumors.
 
Weight loss, tumor shrinkage, and tissue edema induce substantial modification of patient’s anatomy during head and neck (HN) radiotherapy (RT) or chemo-radiotherapy... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Improving quality assurance for assembled COMS eye plaques using a pinhole gamma camera.
 
A quality assurance system has been designed to verify the location and strength of seeds loaded in a brachytherapy eye plaque. This system consists of (1) a pinhole camera in conjunction with a Lumisys ACR-2000i computed radiography (CR) unit to image the location... [+ leia mais]
Fonte: Medical Physics.
 
 
The accuracy of MU calculations for dynamic wedge with the Varian s Anisotropic Analytical Algorithm.
 
In November 2007 Varian Medical Systems released a new version of ECLIPSE (version 8.1.17), which includes a correction to its Anisotropic Analytical Algorithm affecting monitor unit calculations for Enhanced Dynamic Wedge. The purpose of this study is to evaluate and compare the accuracy of the MU calculations for version 8.1.17... [+ leia mais]
Fonte: Medical Physics.
 
 
Sparing the contralateral submandibular gland in oropharyngeal cancer patients: A planning study.
 
The submandibular glands are proposed to be important in preventing xerostomia in head-and-neck cancer patients. We investigated the feasibility of sparing the contralateral submandibular gland (cSMG) by reducing the dose to the contralateral planning target volume (PTV) and by reducing the clinical target volume (CTV)-to-PTV margin... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Dosimetric comparisons of helical tomotherapy and step-and-shoot intensity-modulated radiotherapy in nasopharyngeal carcinoma.
 
The study evaluates and quantifies the potential dosimetric gains of helical tomotherapy (HT) versus step-and-shoot intensity-modulated radiotherapy (SaS-IMRT) for nasopharyngeal carcinoma (NPC)... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Small SRS photon field profile dosimetry performed using a PinPoint air ion chamber, a diamond detector, a novel silicon-diode array (DOSI), and ...
 
Small photon fields are increasingly used in modern radiotherapy and especially in IMRT and SRS/SRT treatments. The uncertainties related to small field profile measurements can introduce significant systematic errors to the overall treatment process... [+ leia mais]
Fonte: Medical Physics.
 
 
Breast-Conserving Therapy: Radiotherapy Margins for Breast Tumor Bed Boost.
 
To quantify the interfraction position variability of the excision cavity (EC) and to compare the rib and breast surface as surrogates for the cavity. Additionally, we sought to determine the required margin for on-line, off-line and no correction protocols in external beam radiotherapy... [+ leia mais]
Fonte: Int J Radiat Oncol Biol Phys.
 
 
Semiconductor Nanoparticles as Energy Mediators for Photosensitizer-Enhanced Radiotherapy.
 
It has been proposed that quantum dots (QDs) can be used to excite conjugated photosensitizers and produce cytotoxic singlet oxygen. To study the potential of using such a conjugate synergistically with radiotherapy to enhance cell killing, we investigated the energy transfer from megavoltage (MV) X-rays to a photosensitizer using QDs as the mediator and quantitated the enhancement in cell killing... [+ leia mais]
Fonte: Int J Radiat Oncol Biol Phys.
 
 
A real-time dynamic-MLC control algorithm for delivering IMRT to targets undergoing 2D rigid motion in the beam s eye view.
 
An MLC control algorithm for delivering intensity modulated radiation therapy (IMRT) to targets that are undergoing two-dimensional (2D) rigid motion in the beam|s eye view (BEV) is presented. The goal of this method is to deliver 3D-derived fluence maps over a moving patient anatomy... [+ leia mais]
Fonte: Medical Physics.
 
 
Geometrical differences in target volumes between slow CT and 4D CT imaging in stereotactic body radiotherapy for lung tumors in the upper and middle.
 
After the installation of a four-dimensional (4D) CT scanner in 2006, 4D CT images have been supplementarily acquired to determine target volumes... [+ leia mais]
Fonte: Medical Physics.
 
 
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