Abstract

After drawbacks and shortages of using conventional kV or MV imaging mode were analyzed, this study proposes a new position verification mode with using the energy larger than 15 MeV or nominal accelerating potential greater than 25 MV X-Ray. The new position verification mode is named HMV imaging mode. Along with the comparison of theoretical analyses, phantom experiments and clinical results to the original imaging modes, this report is going to demonstrate the HMV imaging mode is superior to traditional kV and MV imaging modes. This report first theoretically analyzed three main effects of X-ray interacting with medium by numerous equations and compared their mass attenuation coefficient with different types of tissue. X-ray irradiated on a “Catphan 500” cylinder phantom with different energies to verify these theoretical results. Furthermore, based on phantom experiments’ results, we have done numerous clinical trials and comparisons with patient’s clinical results. The theoretical and experimental results illustrate that the scanned images from HMV mode have a good quality and have ability to identify different tissue components clearly. HMV imaging mode overcomes drawbacks of position verification from both kV and MV level imaging mode as well as keeping advantages of kV and MV imaging mode. The result indicates that HMV is a good position verification mode in radiotherapy.

Highlights

  • IntroductionIn today’s world, choosing reasonable ways to detect and treat malignant tumor becomes a hot debated issue

  • In today’s world, choosing reasonable ways to detect and treat malignant tumor becomes a hot debated issueHow to cite this paper: Zhang, Q.S., Wang, X.W., Sun, Q.Y., Jin, Y.H., Li, Y., Li, Z.Y., Sun, T. and Wang, L. (2016) Investigation and Application of High Megavoltage X-Ray Imaging Mode in Radiotherapy

  • Chen [3] stated tumor’s verification image during radiotherapy period is an essential process and Imaging Guide Radiotherapy Therapy (IGRT) is a new developed system for ensuring tumor to be irradiated at precise position

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Summary

Introduction

In today’s world, choosing reasonable ways to detect and treat malignant tumor becomes a hot debated issue. For radiotherapy equipments with kV level imaging mode, it has good image quality and contrast between tissues and anatomical structures. Many manufacturers invest more employees, extend material resources and researchers with applying additional software or equipment modifications to improve the image resolving capability and quality for MV level imaging mode. Such plans of redesigning the size of EPID in MV imaging mode aim to collect more photons, combining kV imaging with optical imaging devices minimizing dose on patients [7] and using a dual energy radiotherapy imager to acquire the scanning images from both kV and MV imaging mode [9]. The HMV mode is possible to preserve all of benefits of kV and MV modes as well as remove the obstacles of size, cost and complexity of kV mode

Theoretical Basis and Method
Theoretical Basis and Method σt
Cross-Section for the Compton Effect
Cross-Section for the Electronic Pair Effect
Experiment
Results
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