نتایج جستجو برای: radiotherapy beam scanning
تعداد نتایج: 319526 فیلتر نتایج به سال:
The aim of this study was to determine whether the addition of concurrent cisplalin and hyperfractionation in external pelvic radiotherapy improves local control and survival in paticnts with locally advanced carcinoma cervix as compared to treatment with conventional radiolherap.J alonc. The morbidity oftwo treatment protocols was also compared. Sixty patients of ne" I) diagnosed squamous cell...
s 17th Annual SASRO Meeting, Davos 2013 Physics Oral P01-22 P01 Phantom based kV-CBCT dose plan calculations for re-planning decision: comparison with CT-based dose plans P01 P02 First experimental results of motion mitigation by continuous line scanning P02 P03 Impact of respiratory-correlated CT reconstruction algorithms in the choice of margin definition for free breathing lung treatment P03...
in this work, laser bending of perforated sheets has been investigated numerically. laser bending of perforated sheets is more complicated than non-perforated sheets due to their complex geometries. in this paper, laser bending of perforated sheets is studied numerically in the form of thermo-mechanical analysis with abaqus/implicit code. for this purpose, the effects of process and sheet param...
Removal of the undesired time-energy correlations in the electron beam is of paramount importance for efficient lasing of a high-gain free-electron laser. Recently, it has been theoretically and experimentally demonstrated that the longitudinal wakefield excited by the electrons themselves in a corrugated structure allows for precise control of the electron beam phase space. In this Letter, we ...
هدف این پایان نامه طراحی یک آنتن مایکرواستریپی در باند 900mhz با قابلیت ایجاد پلاریزاسیون های دایروی , بیضوی و خطی افقی و عمودی به صورت کنترل شده می باشد. این آنتن دارای قابلیت تنظیم فرکانس رزونانس , پهنای باند و axial ratio در یک رنج محدود را نیز داراست. سپس با استفاده از برخی تکنیک های فشرده سازی آنتن طراحی شده تا حد ممکن فشرده شد. ابتدا آنتن پچ مربعی به صورت ring مربعی در آمده و بدینوسیله تا...
PURPOSE To systematically review the evidence for the use of stereotactic radiosurgery or stereotactic fractionated radiation therapy in adult patients with malignant glioma. METHODS Key clinical questions to be addressed in this evidence-based review were identified. Outcomes considered were overall survival, quality of life or symptom control, brain tumor control or response and toxicity. M...
In recent years, radiotherapy for liver cancer has accomplished much technical progress. The history of radiotherapy for liver cancer shows an endeavor to overcome the problem of how to raise the irradiation dose to lesions while suppressing the unnecessary irradiation dose to normal liver tissue. With the appearance of treatment using X-ray radiotherapy represented by three-dimensional conform...
This document briefly describes how a couple of radiotherapy secondorder cone program (SOCP) benchmark test cases were generated. The seven-beam and thirty-beam cases are now part of the conic benchmark library CBLIB, http://cblib.zib.de/. The basic radiotherapy optimization problem is optimize the beam intensities delivered from various angles around the patient so as to minimize dose to healt...
To solve the long object problem, an exact and efficient algorithm has been recently developed by Katsevich. While the Katsevich algorithm only works with standard helical cone-beam scanning, there is an important need for nonstandard spiral cone-beam scanning. Specifically, we need a scanning spiral of variable radius for our newly proposed electron-beam CT/micro-CT prototype. In this paper, f...
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