نتایج جستجو برای: radiotherapy intensity modulated

تعداد نتایج: 290062  

2016
Jia-Yang Lu Jing Zheng Wu-Zhe Zhang Bao-Tian Huang Shian-Ying Sung

PURPOSE To evaluate the dosimetric impacts of flattening filter-free (FFF) beams in intensity-modulated radiotherapy (IMRT) and volumetric modulated arc therapy (VMAT) for sinonasal cancer. METHODS For fourteen cases, IMRT and VMAT planning was performed using 6-MV photon beams with both conventional flattened and FFF modes. The four types of plans were compared in terms of target dose homoge...

2014
Ming X Jia Xu Zhang Ce Yin Ge Feng Na Li Song Gao Da W Liu

PURPOSE The aim of this study was to investigate the peripheral doses resulting from volumetric modulated arc therapy (VMAT) and intensity modulated radiotherapy (IMRT) techniques in cervical cancer radiotherapy. METHODS Nine patients with cervical cancer had treatment planned with both VMAT and IMRT. A specially designed phantom was used for this study, with ion chambers placed at interest p...

Journal: :Proceedings 2017
Luis Alberto Vazquez-Quino Claudia Ivette Huerta-Hernandez Dharanipathy Rangaraj

Mobius FX, an add-on software module from Mobius Medical Systems™ for intensity-modulated radiation therapy (IMRT) quality assurance (QA), uses linac treatment logs to efficiently calculate and verify the 3D dose delivered to patients. An advantage of the Mobius FX module is that it does not require device positioning. In this study, we compared the Mobius FX with another QA option, ArcCheck, a...

Journal: :Medical physics 2008
Amit Sawant Raghu Venkat Vikram Srivastava David Carlson Sergey Povzner Herb Cattell Paul Keall

Tumor tracking using a dynamic multileaf collimator (DMLC) represents a promising approach for intrafraction motion management in thoracic and abdominal cancer radiotherapy. In this work, we develop, empirically demonstrate, and characterize a novel 3D tracking algorithm for real-time, conformal, intensity modulated radiotherapy (IMRT) and volumetric modulated arc therapy (VMAT)-based radiation...

2017
Ashokkumar Sangaiah K M Ganesh K Ramalingam K Karthikeyan N Jagadheeskumar

Background: Recently we have upgraded our Varian Clinac 2100CD with a 6MV FFF beam, this upgrade being the first of its kind in our country. Even though the dosimetric characteristics of FFF beams have been reported both in experimental and Monte Carlo studies, application in planning and delivery is complex. The aim of this study was to validate the commissioning of upgraded FFF beams dosimetr...

2016
Young Suk Kim Jaegi Lee Jong In Park Wonmo Sung Sol Min Lee Gwi Eon Kim

PURPOSE Radiotherapy of the neck is known to cause carotid artery stenosis. We compared the carotid artery dose received between volumetric modulated arc therapy (VMAT) and conventional fixed-field intensity-modulated radiotherapy (IMRT) plans in patients with early glottic cancer. MATERIALS AND METHODS Twenty-one early glottic cancer patients who previously underwent definitive radiotherapy ...

2010
Barbara Dobler Karin Weidner Oliver Koelbl

BACKGROUND AND PURPOSE The purpose of this study was to assess plan quality and treatment time achievable with the new VMAT optimization tool implemented in the treatment planning system Oncentra MasterPlan® as compared to IMRT for Elekta SynergyS® linear accelerators. MATERIALS AND METHODS VMAT was implemented on a SynergyS® linear accelerator (Elekta Ltd., Crawley, UK) with Mosaiq® record a...

2010
SA Bhide CM Nutting

Radiation therapy has come a long way from treatment planning based on orthogonal radiographs with large margins around tumours. Advances in imaging and radiation planning software have led to three-dimensional conformal radiotherapy and, further, to intensity modulated radiotherapy (IMRT). IMRT permits sparing of normal tissues and hence dose-escalation to tumours. IMRT is the current standard...

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