(Sunday, 7/14/2019)
Room: ePoster Forums
Purpose: During radiation therapy, the movement caused by the patient’s breathing can lead to the administration of inadequate doses near the tumor areas or excessive doses to normal tissues. In this study, respiration-induced motion was corrected using a custom-built reverse bed, which allowed the correct dose of radiation to be delivered to the tumor area.
Methods: A custom-built lung phantom and a custom-built tumor phantom were used with the dynamic CIRS chest phantom to simulate the movement of the organs during breathing. In this study, we also performed clinical trials.
Results: The dose measurement results of the CIRS phantom under respiratory amplitudes of 5 mm, 10 mm, 15 mm, 20 mm and 25 mm showed that the average doses administered to the tumor areas were 97.7%, 94.6%, 90.8%, 88.2% and 81.3%, respectively, of that administered to the motionless tumor (0 mm). With the custom-built reverse bed, the average doses to the tumor areas reached 98.0%, 97.7%, 97.9%, 96.7% and 96.5%, respectively.
Conclusion: The custom-built reverse bed was able to effectively compensate for respiration-induced motion during free breathing, enabling the administration of accurate doses to tumor areas and lowering the exposure to radiation in surrounding tissue.
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