Field output factors for small fields: A large multicentre study

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Measurement Of Scatter Factors For Small Photon Fields Using Gaf chromic EBT2 Film

Introduction: Small field dosimetry is challenging for radiotherapy dosimetry. measurement of the output factor in the air and water (Sc, Scp) is one of the input parameters for commissioning of treatment planning systems and beam modeling. The aims of this study are to measured Sc,Scp for small fields with EBT2 and Ion chamber and design a appropriate mini-phantom for small fi...

متن کامل

Risk factors for IUD failure: results of a large multicentre case-control study.

BACKGROUND This study was conducted to identify the risk factors for intrauterine device (IUD) failure. METHODS A retrospective case-control study was carried out between 1999 and 2002. Cases (women with an IUD and a confirmed pregnancy) and controls (women with an IUD and who were not pregnant) were recruited by gynaecologists. An anonymous questionnaire was filled in during the consultation...

متن کامل

Energy and field size dependence of a silicon diode designed for small-field dosimetry

Purpose: To investigate the energy dependence/spectral sensitivity of silicon diodes designed for small-field dosimetry and obtain response factors (RFs) for arbitrary photon spectra using Monte Carlo (MC) simulations.   Methods: The EGSnrc user-code DOSRZnrc was used to calculate the dose deposition in water and in the active volume of a stereotactic diode f...

متن کامل

Assessment of an Unshielded Electron Field Diode Dosimeter for Beam Scanning in Small- to Medium-Sized 6 MV Photon Fields

Introduction Radiotherapy planning systems require many percentage depth dose (PDD) and profile measurements and there are various dosimeters that can be used to obtain these scans. As dose perturbation is particularly troublesome in smaller photon fields, using a low-perturbation, unshielded electron field diode (EFD) in these fields is of interest. The aim of this work was to investigate the ...

متن کامل

A study of strategy of Small Economies facing the Transition of large Economies Industrial Structure

Taiwan economy has always been export-oriented, creating tightly-linked industrial chains between cross-straits companies tightly. Understanding the influence of transforming industrial patterns of major economic entities would be critical for long-term cooperative small economic entities (countries or regions) in the periphery. The author of this paper has thus analyzed the influences and ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Physica Medica

سال: 2021

ISSN: 1120-1797

DOI: 10.1016/j.ejmp.2021.01.001