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Mitsubishi Tension Controller Le 30 Cta Manual jainatt



 


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The tension controller LE-30CTN is the model no. for a basic tension controller. This product was designed and developed by Melite. 1. INTRODUCTION {#acm212521-sec-0001} =============== There are many factors that could affect the radiographic image quality of a digital portal image including patient positioning errors, image geometry, and film processing.[1](#acm212521-bib-0001){ref-type="ref"}, [2](#acm212521-bib-0002){ref-type="ref"} These factors may also affect the image quality when the radiographic image is used to set the portal image geometry, to detect and correct the setup errors, or to verify the radiation dose. Therefore, an image quality assurance (QA) procedure for portal images is essential for the purpose of realizing accurate radiotherapy.[3](#acm212521-bib-0003){ref-type="ref"}, [4](#acm212521-bib-0004){ref-type="ref"} An electron beam simulator with a digital portal imager (DPI) system (Oncentra Pro Vision; Nucletron B.V., an Elekta company, Elekta AB, Stockholm, Sweden) is an image‐based QA system that is designed to generate image‐based QA tests for radiographic images. The DPI system provides a unique method to verify the geometric distortions in portal images and to determine the performance characteristics of the portal imager.[5](#acm212521-bib-0005){ref-type="ref"} The DPI system uses two‐dimensional (2D) calibration patterns with fiducial markers placed at a predetermined distance from the portal imager to calculate the geometric distortion in the portal images. Because the DPI system produces portal images with a different geometric distortion than that of the image intensifier‐based radiographic images, the calibration patterns are placed on the patient table in front of the imager with the assistance of a customized stereotactic frame and DPI equipment. However, because the DPI system has a limited field of view (FOV), the calibration patterns must be repositioned every time when the patient position is changed and/or when the imaging fields of the portal imager are changed. Therefore, the DPI system is inconvenient to use and requires time and effort. The goal

 

 


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Mitsubishi Tension Controller Le 30 Cta Manual jainatt

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