نتایج جستجو برای: siemens primus linac

تعداد نتایج: 9554  

A. Ebrahimzadeh Pezeshki, M. Mohammadi, S. Abdollahi, Z. Alizadeh,

Background: In order to deliver the precise dose to the target in radiotherapy, absorbed dose to water at the reference point should be assessed. When the calibration procedure is performed for a reference dosimeter in the 60Co beam of a Secondary Standard Dosimetry Laboratory (SSDL), the total uncertainty in absorbed dose to water (Dw) is estimated to be approximately 1.5%. This study attempts...

Background: EBT and EBT3 radioChromic films have been used in radiotherapy dosimetry for years.Objective: The aim of the current study is to compare EBT and EBT3 radioChromic films in dosimetry of radiotherapy fields for treatment of parotid cancer.Methods: Calibrations of EBT and EBT3 films were performed with identical setups using a 6 MV photon beam of a Siemens Primus linac. Skin dose was m...

الهویردی پورفلاح, طیب, اکبری, محمود رضا , قاسمی, آرش ,

Background and purpose: Due to creation of scattered radiation when using non-carbon fiber base plates particularly in treating breast cancer, applying this device can affect skin and body surface dose. Recently, using Gaf-Chromic films have led to obtaining good results in skin dosimetry. The purpose of this study was the estimation of skin dose in applying non-carbon fiber base plates using w...

2015
Pejman Rowshanfarzad Peter Häring Hans L Riis Sune J Zimmermann Martin A Ebert

BACKGROUND In radiotherapy treatments, it is crucial to monitor the performance of linac components including gantry, collimation system, and electronic portal imaging device (EPID) during arc deliveries. In this study, a simple EPID-based measurement method is suggested in conjunction with an algorithm to investigate the stability of these systems at various gantry angles with the aim of evalu...

2003
N. D. Richmond C. P. Walker

Investigations were made into the beam profile shape and dose delivered by the Siemens Virtual Wedge trade mark under standard operational conditions compared with those following delivery interruption on two Siemens Primus linear accelerators (Type 7445 and 8067) running different versions of control software (7.2 and 7.0, respectively). The shape of the Virtual Wedge trade mark profiles was f...

Journal: :Applied sciences 2022

For the medical linear accelerators (linac) that utilize more than 10 MV of photon energy, components inside linac head become radioactivate during 10–15-year operating cycle. Prior to disposal, radioactive waste must be evaluated for activity, and same procedure should followed linacs. In Republic Korea, regulation methodology radioactivity evaluation is not established yet. this study, we emp...

Journal: :Sustainability 2023

In Korea, when replacing or discarding parts of a medical linear accelerator (linac), self-disposal is required in the consideration activity, but there no standard regulation to manage radioactive waste. The aim this study check activity each part determine disposal time according clearance level for self-disposal. results measuring components linac head disposed Varian, Elekta, and Siemens eq...

Introduction: During the last decades, simulation of radiation therapy treatment conditions in treatment room for studying with more details in comparison with treatment planning system (TPS) is taken into consideration. The most problem with starting these kind of researches is the geometry of Medical linacs and verification of the accelerators. Therefore, researchers tried to...

Journal: :Medical physics 2012
M Castrillon Fernandez C Venencia E Garrigó L Caussa

PURPOSE To compare measured and calculated doses using Pencil Beam (PB) and Monte Carlo (MC) algorithm on a CIRS thorax phantom for SBRT lung treatments. METHODS A 6MV photon beam generated by a Primus linac with an Optifocus MLC (Siemens) was used. Dose calculation was done using iPlan v4.1.2 TPS (BrainLAB) by PB and MC (dose to water and dose to medium) algorithms. The commissioning of both...

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