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ABFM NEWS - Radioterapia
 
Image-guided intensity-modulated radiotherapy (IG-IMRT) for biliary adenocarcinomas: Initial clinical results.
 
Biliary tract lesions are comparatively rare neoplasms, with ambiguous indications for radiotherapy. The specific aim of this study was to report the clinical results of a single-institution biliary tract series treated with modern radiotherapeutic techniques, and detail results using both conventional and image-guided intensity-modulated radiation therapy (IG-IMRT). [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Quality assurance for clinical implementation of an electromagnetic tracking system.
 
The Calypso® Medical 4D localization system utilizes alternating current electromagnetics for accurate, real-time tumor tracking. A quality assurance program to clinically implement this system is described here. [+ leia mais]
Fonte: Medical Physics.
 
 
Four-dimensional measurement of intrafractional respiratory motion of pancreatic tumors using a 256 multi-slice CT scanner.
 
To quantify pancreas and pancreatic tumor movement due to respiratory motion using volumetric cine CT images. [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Dose escalation with proton or photon radiation treatment for pancreatic cancer.
 
The purpose was to determine the optimal radiation therapy modality (three-dimensional conformal photon-radiation therapy [3DCRT], intensity-modulated photon-radiation therapy [IMRT], or passive-scattering proton therapy [PT]) for safe dose escalation (72Gy) in pancreatic tumors in different positions relative to organs at risk (OAR) anatomy. [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Radioprotective Effect of Moderate Wine Consumption in Patients With Breast Carcinoma.
 
Given the high cost and side effects of radioprotective agents such as amifostine, attention has been focused on potentially equally effective but less expensive and toxic natural substances. We evaluated the potential radioprotective effects of wine in preventing skin toxicity in patients with breast cancer. [+ leia mais]
Colaborador: Marcela Setti.
Fonte: Int J Radiat Oncol Biol Phys.
 
 
Verification of four-dimensional photon dose calculations.
 
Recent work in the area of thoracic treatment planning has been focused on trying to explicitly incorporate patient-specific organ motion in the calculation of dose. [+ leia mais]
Fonte: Medical Physics.
 
 
Validation of the final aperture superposition technique to calculate electron output factors and depth dose curves.
 
The final aperture superposition technique (FAST) is a method to reproduce rapidly the electron-beam depth dose curves and output factors that would be calculated by a full Monte Carlo simulation. [+ leia mais]
Fonte: Medical Physics.
 
 
Evaluation of the dosimetric impact of non-exclusion of the rectum from the boost PTV in IMRT treatment plans for prostate cancer patients.
 
n dose escalation trial, for prostate cancer patients, zero CTV–PTV margins towards the rectum are often applied in the boost phase in order to avoid excessive dose delivery to the rectum. In this study, the dosimetric impact of non-exclusion of the rectum from the boost PTV is evaluated. [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Endo-rectal balloon cavity dosimetry in a phantom: Performance under IMRT and helical tomotherapy beams.
 
The use of endo-rectal balloons as immobilisation devices in external beam radiotherapy for prostate cancer has led to improved target position reproducibility and a decrease in rectal toxicity. The air cavity created by an endo-rectal balloon in photon radiotherapy perturbs the dose distribution. [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
The accuracy of the pencil beam convolution and anisotropic analytical algorithms in predicting the dose effects due to attenuation...
 
When a photon beam passes through the treatment couch or an immobilization device, it may traverse a large air gap (up to 15 cm or more) prior to entering the patient. [+ leia mais]
Fonte: Medical Physics.
 
 
Dosimetric effects of rotational output variation and x-ray target degradation on helical tomotherapy plans.
 
In this study, two potential sources of IMRT delivery error have been identified for helical tomotherapy delivery using the HiART system (TomoTherapy, Inc., Madison, WI): Rotational output variation and target degradation. [+ leia mais]
Fonte: Medical Physics.
 
 
Tolerances on MLC leaf position accuracy for IMRT delivery with a dynamic MLC.
 
The objective determination of performance standards for radiation therapy equipment requires, ideally, establishing the quantitative relationship between performance deviations and clinical outcome or some acceptable surrogate. [+ leia mais]
Fonte: Medical Physics.
 
 
A randomised controlled trial of forward-planned radiotherapy (IMRT) for early breast cancer: Baseline characteristics and dosimetry results.
 
This large trial was designed to investigate whether correction of dose inhomogeneities using intensity-modulated radiotherapy (IMRT) reduces late toxicity and improves quality of life in patients with early breast cancer. This paper reports baseline characteristics of trial participants and dosimetry results. [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Effects of Respiration-Induced Density Variations on Dose Distributions in Radiotherapy of Lung Cancer.
 
To determine the effect of respiration-induced density variations on the estimated dose delivered to moving structures and, consequently, to evaluate the necessity of using full four-dimensional (4D) treatment plan optimization. [+ leia mais]
Fonte: Int J Radiat Oncol Biol Phys.
 
 
A Novel Device for Intravaginal Electronic Brachytherapy.
 
Postoperative intravaginal brachytherapy for endometrial carcinoma is usually performed with 192Ir high-dose rate (HDR) afterloading. A potential alternative is treatment with a broadband 50kV X-ray point source... [+ leia mais]
Fonte: Int J Radiat Oncol Biol Phys.
 
 
Recommendations for clinical electron beam dosimetry: Supplement to the recommendations of Task Group 25.
 
The goal of Task Group 25 (TG-25) of the Radiation Therapy Committee of the American Association of Physicists in Medicine (AAPM) was to provide a methodology and set of procedures for a medical physicist performing clinical electron beam dosimetry in the nominal energy range of 5–25 MeV. [+ leia mais]
Colaborador: Laura Natal Rodrigues.
Fonte: Medical Physics.
 
 
An international review of patient safety measures in radiotherapy practice.
 
Errors from radiotherapy machine or software malfunction usually are well documented as they affect hundreds of patients, whereas random errors affecting individual patients are more difficult to be discovered and prevented. [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
General strategy for the protection of organs at risk in IMRT therapy of a moving body.
 
We investigated protection strategies of organs at risk (OARs) in intensity modulated radiation therapy (IMRT). These strategies apply to delivery of IMRT to moving body anatomies that show relative displacement of OAR in close proximity to a tumor target. [+ leia mais]
Fonte: Medical Physics.
 
 
Fractionated stereotactic radiotherapy: A method to evaluate geometric and dosimetric uncertainties using radiochromic films.
 
In the authors| hospital, stereotactic radiotherapy treatments are performed with a Varian Clinac 600C equipped with a BrainLAB m3 micro-multileaf-collimator generally using the dynamic conformal arc technique. [+ leia mais]
Fonte: Medical Physics.
 
 
Comparison between the ideal reference dose level and the actual reference dose level from clinical 3D radiotherapy treatment plans.
 
Retrospective study of 3D clinical treatment plans based on radiobiological considerations in the choice of the reference dose level from tumor dose–volume histograms. [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy & Oncology.
 
 
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