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KMID : 1164220150270010079
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Journal of Korean Society for Radiotherapeutic Technology
2015 Volume.27 No. 1 p.79 ~ p.86
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A study on uncertainty by passage of time of stereotactic body radiation therapy for spine metastasis cancer
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Cho Yong-Wan
Kim Joo-Ho
Ahn Seung-Kwon
Lee Sang-Kyu
Cho Jeong-Hee
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Abstract
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Purpose : The purpose of this study was to determine the proper treatment time of stereotactic body radiation therapy for spine metastasis cancer by using the image guidance system of CyberKnife(Accuray Incorporated, USA) which is able to correct movements of patients during the treatment.
Materials and Methods : Fifty seven spine metastasis cancer patients who have stereotactic body radiation therapy of CyberKnife participate, 8 of them with cervical spine cancer, 26 of them with thoracic spine cancer, and 23 of them with lumbar spine cancer. X-ray images acquired during the treatment were classified by treatment site. From the starting point of treatment, motion tendency of patients is analyzed in each section which is divided into every 5 minutes.
Results : In case of cervical spine, there is sudden increase of variation in 15 minutes after the treatment starts in rotational direction. In case of thoracic spine, there is no significantly variable section. However, variation increases gradually with the passage of time so that it is assumed that noticeable value comes up in approximately 40 minutes. In case of lumbar spine, sharp increase of variation is seen in 20 minutes in translational and rotational direction.
Conclusion : Without having corrections during the treatment, proper treatment time is considered as less than 15 minutes for cervical spine, 40 minutes for thoracic spine, and 20 minutes for lumbar spine. If treatment time is longer than these duration, additional patient alignments are required or PTV margin should be enlarged.
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KEYWORD
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spine metastasis cancer, stereotactic body radiation therapy, treatment time, CyberKnife
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