نتایج جستجو برای: dosimetric audit absolute photon dose linacs
تعداد نتایج: 491847 فیلتر نتایج به سال:
A dose audit of 16 facilities in 11 countries has been performed within the framework of the Forum for Nuclear Cooperation in Asia (FNCA) quality assurance program. The quality of radiation dosimetry varies because of the large variation in radiation therapy among the participating countries. One of the most important aspects of international multicentre clinical trials is uniformity of absolut...
This study introduces the HYPERSCINT research platform, first commercially available scintillation dosimetry platform capable of multi-point through hyperspectral approach. Optic and dosimetric performances system were investigated comparison with another solution, Ocean Optics QE65Pro spectrometer. The optical characterization was accomplished by measuring linearity signal as a function integr...
INTRODUCTION External photon beam modulation using compensators in order to achieve a desired dose distribution when brachytherapy treatment is followed by external beam radiation is a well-established technique. A compensator modulates the central part of the beam, and the dose beneath the thickest part of the compensator is delivered mostly by scattered, low energy photons. A two-dimensional ...
The aim of this work is to develop and investigate an inverse treatment planning process (TPP) for mixed beam radiotherapy (MBRT) capable of performing simultaneous optimization of photon and electron apertures. A simulated annealing based direct aperture optimization (DAO) is implemented to perform simultaneous optimization of photon and electron apertures, both shaped with the photon multilea...
Background: To evaluate the dosimetric difference between conventional and three-dimensional conformal Radiotherapy (3D-CRT) using 6 and 18 MV X-ray photons. Materials and Methods: Computed tomography scans of 26 pelvic patients were acquired and transferred to the 3D treatment planning system. For each patient, 8 Conventional plans (3, 4, 5 and 6 Fields) and one 3D-CRT plan were prep...
background: the formalism recommended by task group 60 (tg-60) of the american association of physicists in medicine (aapm) is applicable for β sources. radioactive biocompatible and biodegradable 153sm glass seed without encapsulation is a β- emitter with a short half life and delivers a high dose rate to the tumor in the millimeter range. in this work the dosimetry parameters of the seed for ...
A National Project for the in-vivo dosimetry in radiotherapy: first results A.Piermattei 1 , L. Azario 1 , S. Cilla 2 , A.Fidanzio 1 , F.Greco 1 , M.T.Russo 3 , S. Zucca 4 1 Istituto di Fisica e Unità Operativa di Fisica Sanitaria, Università Cattolica del S. Cuore, Roma 2 Unità Operativa di Fisica Sanitaria, Fondazione per la Ricerca e Cura ‘Giovanni Paolo II’, Campobasso 3 Unità Operative di ...
A novel phantom is presented for 'full system' dosimetric audit comparing planned and delivered dose distributions in HDR gynaecological brachytherapy, using clinical treatment applicators. The brachytherapy applicator dosimetry test object consists of a near full-scatter water tank with applicator and film supports constructed of Solid Water, accommodating any typical cervix applicator. Film d...
PURPOSE This study aims to compare the dosimetric data of local tumor's bed dose escalation (boost) with photon beams (external beam radiation therapy - EBRT) versus high-dose-rate interstitial brachytherapy (HDR-BT) after breast-conserving treatment in women with early-stage breast cancer. MATERIAL AND METHODS We analyzed the treatment planning data of 136 irradiated patients, treated betwee...
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