After drawbacks and shortages of using conventional kV or MV imaging mode were analyzed, this\nstudy proposes a new position verification mode with using the energy larger than 15 MeV or nominal\naccelerating potential greater than 25 MV X-Ray. The new position verification mode is\nnamed HMV imaging mode. Along with the comparison of theoretical analyses, phantom experiments\nand clinical results to the original imaging modes, this report is going to demonstrate the\nHMV imaging mode is superior to traditional kV and MV imaging modes. This report first theoretically\nanalyzed three main effects of X-ray interacting with medium by numerous equations and\ncompared their mass attenuation coefficient with different types of tissue. X-ray irradiated on a\nââ?¬Å?Catphan 500ââ?¬Â cylinder phantom with different energies to verify these theoretical results. Furthermore,\nbased on phantom experimentsââ?¬â?¢ results, we have done numerous clinical trials and\ncomparisons with patientââ?¬â?¢s clinical results. The theoretical and experimental results illustrate that\nthe scanned images from HMV mode have a good quality and have ability to identify different tissue\ncomponents clearly. HMV imaging mode overcomes drawbacks of position verification from\nboth kV and MV level imaging mode as well as keeping advantages of kV and MV imaging mode.\nThe result indicates that HMV is a good position verification mode in radiotherapy
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