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ABFM NEWS - Radioterapia
 
Online MRI guidance for healthy tissue sparing in patients with cervical cancer: An IMRT planning study.
 
During cervical cancer treatment, target volumes change position and shape due to organ motion and tumour regression. An MRI-accelerator will provide information on these changes by online magnetic resonance imaging (MRI) guidance throughout each treatment fraction. The purpose of this intensity-modulated radiation therapy (IMRT) planning study is to assess the benefit of online MRI guidance in healthy tissue sparing... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiation & Oncology.
 
 
Motion and deformation of the target volumes during IMRT for cervical cancer: What margins do we need?
 
For cervical cancer patients the CTV consists of multiple structures, exhibiting complex inter-fraction changes. The purpose of this study is to use weekly MR imaging to derive PTV margins that accommodate these changes... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiation & Oncology.
 
 
A dosimetric comparison of two high-dose-rate brachytherapy planning systems in cervix cancer: Standardized template planning vs. computerized...
 
High-dose-rate brachytherapy is an important component of the curative treatment for cervical cancer. Some institutions use standardized template planning (STP), based on a precalculated table of dose rates, instead of computerized treatment planning (CTP)... [+ leia mais]
Fonte: Brachytherapy.
 
 
The use of new Gafchromic® EBT film for 125I seed dosimetry in Solid Water® phantom.
 
Radiochromic film dosimetry has been extensively used for intravascular brachytherapy applications for near field within 1 cm from the sources. With the recent introduction of new model of radiochromic films, GAFCHROMIC® EBT, with higher sensitivity than earlier models, it is promising to extend the distances out to 5 cm for low dose rate (LDR) source dosimetry... [+ leia mais]
Fonte: Medical Physics.
 
 
Novel prostate brachytherapy technique: Improved dosimetric and clinical outcome.
 
Erectile dysfunction following prostate brachytherapy is reported to be related to dose received by the penile bulb. To minimise this, whilst preserving prostate dosimetry, we have developed a technique for I-125 seed brachytherapy using both stranded seeds and loose seeds delivered with a Mick applicator, and implanted via the sagittal plane on trans-rectal ultrasound... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
An analysis of the relation between physical characteristics of prostate I-125 seed implants and lower urinary tract symptoms: Bladder hotspot dose...
 
Lower urinary tract symptoms are frequently observed after I-125 seed implantation of the prostate. More knowledge about causes and predictors is necessary to be able to develop less toxic implantation techniques. The aim of this study was to identify implantation related factors that contribute to post-implant urinary morbidity... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
MRI-based preplanning in low-dose-rate prostate brachytherapy.
 
To compare the dosimetric results between MRI-based and TRUS-based preplanning in permanent prostate brachytherapy, and to estimate the accuracy of MRI-based preplanning by comparing with CT/MRI fusion-based postimplant dosimetry... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Prostate bed localization with image-guided approach using on-board imaging: Reporting acute toxicity and implications for radiation therapy planning.
 
To report our experience using Image-Guided Radiation Therapy (IGRT) in patients undergoing post-prostatectomy irradiation... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
DMLC IMRT delivery to targets moving in 2D in Beam s Eye View.
 
The goal of this article is to present the algorithm for DMLC leaf control capable of delivering IMRT to tumors that experience motion in two dimensions in the beams eye view (BEV) plane. The generic, two-dimensional (2D) motion of the projection of the rigid target on BEV plane can be divided into two components... [+ leia mais]
Fonte: Medical Physics.
 
 
Long-Term Results and Prognostic Factors of Fractionated Strontium-90 Eye Applicator for Pterygium.
 
Between 1993 and 2005, 623 patients with 737 pterygium lesions were treated with a strontium-90 eye applicator after surgical excision. The median follow-up period was 60 months (range, 6.7–139.5). Of the 737 lesions, 644 were primary and 93 were recurrences after surgical removal alone. Fractionated radiotherapy (RT) to a total dose of 35 Gy in five to seven fractions was used... [+ leia mais]
Fonte: Int J Radiat Oncol Biol Phys.
 
 
In vivo alanine/electron spin resonance (ESR) dosimetry in radiotherapy of prostate cancer: A feasibility study.
 
We have developed a device to evaluate the potential of alanine/electron spin resonance (ESR) dosimetry for quality assurance in 3D conformal radiotherapy for prostate cancer. It consists of a rectal balloon carrying eight alanine dosimeter probes and two metal markers to document the exact position of the balloon... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Dosimetric evaluation of prostate rotations and their correction by couch rotations.
 
To investigate the dosimetric effect of prostate rotations and limited on-line corrections by couch rotations (<3°) for prostate, seminal vesicles and organs at risk... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Influence of Organ Motion on Conformal vs. Intensity-Modulated Pelvic Radiotherapy for Prostate Cancer.
 
To compare an intensity-modulated radiotherapy (IMRT) planning approach for prostate pelvic RT with a conformal RT (CRT) approach taking into account the influence of organ-at-risk (OAR) motion... [+ leia mais]
Fonte: Int J Radiat Oncol Biol Phys.
 
 
On the production of neutrons in laminated barriers for 10 MV medical accelerator rooms.
 
When space limitations are primary constraints, laminated barriers with metals can be an option to provide sufficient shielding for a radiotherapy treatment room. However, if a photon clinical beam with end point energy of 10 MeV... [+ leia mais]
Fonte: Medical Physics.
 
 
Underestimation of Low-Dose Radiation in Treatment Planning of Intensity-Modulated Radiotherapy.
 
"To investigate potential dose calculation errors in the low-dose regions and identify causes of such errors for intensity-modulated radiotherapy (IMRT)... " [+ leia mais]
Colaborador: Bruno Tiago Rossi.
Fonte: Int J Radiat Oncol Biol Phys.
 
 
Dosimetric Comparison of Bone Marrow-Sparing Intensity-Modulated Radiotherapy Versus Conventional Techniques for Treatment of Cervical Cancer.
 
To compare bone marrow-sparing intensity-modulated pelvic radiotherapy (BMS-IMRT) with conventional (four-field box and anteroposterior–posteroanterior [AP–PA]) techniques in the treatment of cervical cancer... [+ leia mais]
Colaborador: Bruno Tiago Rossi.
Fonte: Int J Radiat Oncol Biol Phys.
 
 
A randomized comparison of interfraction and intrafraction prostate motion with and without abdominal compression.
 
"To quantify inter- and intrafraction prostate motion in a standard VacLok (VL) immobilization device or in the BodyFix (BF) system incorporating a compression element which may reduce abdominal movement... " [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
A phase II trial for the optimisation of treatment position in the radiation therapy of prostate cancer.
 
Patient immobilisation and position are important contributors to the reproducibility and accuracy of radiation therapy. In addition the choice of position can alter the external contour of the treated area and has the potential to alter the spatial relationship between internal organs... [+ leia mais]
Colaborador: Camila Pessoa de Sales.
Fonte: Radiotherapy and Oncology.
 
 
Radiochromic film dosimetry with flatbed scanners: A fast and accurate method for dose calibration and uniformity correction with single film exposure
 
Film dosimetry is an attractive tool for dose distribution verification in intensity modulated radiotherapy (IMRT). A critical aspect of radiochromic film dosimetry is the scanner used for the readout of the film: the output needs to be calibrated in dose response and corrected for pixel value and spatial dependent nonuniformity caused by light scattering; these procedures can take a long time... [+ leia mais]
Colaborador: Bruno Tiago Rossi.
Fonte: Medical Physics.
 
 
Experimental derivation of the fluence non-uniformity correction for air kerma near brachytherapy linear sources.
 
In brachytherapy, one of the elements to take into account for measurements free in air is the non-uniformity of the photon fluence due to the beam divergence that causes a steep dose gradient near the source. The correction factors for this phenomenon have been usually evaluated by two available theories by Kondo and Randolph... [+ leia mais]
Colaborador: Bruno Tiago Rossi.
Fonte: Medical Physics.
 
 
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