نتایج جستجو برای: electronic portal imaging device radiation therapy

تعداد نتایج: 2055089  

2010
Borislava Petrovic Aleksandra Grzadziel Laza Rutonjski Krzysztof Slosarek

INTRODUCTION Enhanced dynamic wedges (EDW) are known to increase drastically the radiation therapy treatment efficiency. This paper has the aim to compare linear array measurements of EDW with the calculations of treatment planning system (TPS) and the electronic portal imaging device (EPID) for 15 MV photon energy. MATERIALS AND METHODS The range of different field sizes and wedge angles (fo...

Journal: :Radiation Oncology (London, England) 2006
Karen L Ullman Holly Ning Robert C Susil Asna Ayele Lucresse Jocelyn Jan Havelos Peter Guion Huchen Xie Guang Li Barbara C Arora Angela Cannon Robert W Miller C Norman Coleman Kevin Camphausen Cynthia Ménard

BACKGROUND We sought to determine the intra- and inter-radiation therapist reproducibility of a previously established matching technique for daily verification and correction of isocenter position relative to intraprostatic fiducial markers (FM). MATERIALS AND METHODS With the patient in the treatment position, anterior-posterior and left lateral electronic images are acquired on an amorphou...

Journal: :Journal of Applied Clinical Medical Physics 2021

Purpose Linear accelerator quality assurance (QA) in radiation therapy is a time consuming but fundamental part of ensuring the performance characteristics delivering machines. The goal this work to develop an automated and standardized QA plan generation analysis system Oncology Information System (OIS) streamline process. Methods Automating process includes two software components: AutoQA Bui...

Journal: :Medical physics 2008
Ross I Berbeco Fred Hacker Chris Zatwarnicki Sang-June Park Dan Ionascu Desmond O'Farrell Harvey J Mamon

Stereotactic body radiation therapy is predicated on a high degree of targeting accuracy. However, inaccurate patient setup as well as intra-fractional motion can hinder the delivery of high doses preferentially to the target. To ensure that the coverage delivered to the patient is as planned, an image-guided verification system has been created to estimate the delivered dose retrospectively. T...

2016
Iori Sumida Hajime Yamaguchi Indra J. Das Hisao Kizaki Keiko Aboshi Mari Tsujii Yuji Yamada Osamu Suzuki Yuji Seo Fumiaki Isohashi Kazuhiko Ogawa

Patient-specific quality assurance for intensity-modulated radiation therapy (IMRT) dose verification is essential. The aim of this study is to provide a new method based on the relative error distribution by comparing the fluence map from the treatment planning system (TPS) and the incident fluence deconvolved from the electronic portal imaging device (EPID) images. This method is validated fo...

Journal: :Medical physics 2003
Wendel Dean Renner Mehrdad Sarfaraz Matthew A Earl Cedric X Yu

Treatment verification has been a weak link in external beam radiation therapy. As new and more complicated treatment techniques, such as intensity-modulated radiation therapy (IMRT), are implemented into clinical practice, verifying the accuracy of treatment delivery becomes increasingly important. Existing methods for treatment verification are highly labor intensive. We have developed a meth...

2008
Tarraf Torfeh Stéphane Beaumont JeanPierre Guédon David Bonnet Eloïse Denis Ludwig David

Electronic Portal Imaging Devices (EPID) are used for the assessment of the geometric accuracy 2 during the radiation therapy process. EPID is also used like a major detector to test performances of the linear accelerator used for the treatment. Therefore, the quality control of portal images 4, 5, 6, 7 is essential for this task. Software tools that are capable to perform an automatic quality ...

Introduction: Electronic portal imaging devices (EPIDs) provide two- and three-dimensional planar and volumetric cone beam images to improve the accuracy of radiation treatment delivery. Periodic quality assurance (QA) of EPIDs is essential for dosimetric verification in radiotherapy. In this study, a QA program was implemented to evaluate the function of the EPID to be confident in applying co...

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