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| Comparison of the Spine Tracking Accuracy between Supine and Prone Position Setups in CyberKnife Treatment |
| XU Hui-jun, DUAN Xue-zhang, Xu Fei, Zhang Jun-hua |
| Radiotherapy Center of Oncology, 302 Hospital of PLA, Beijing 100039 China |
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Abstract Objective Using head and neck, anthropomorphic and lung phantoms to detect the spine tracking accuracy during CyberKnife IGRT treatment, compare the results in supine and prone positions and analyze them, to provide theoretical foundation for the application of supine position in spine tracking system.Methods Scan with CT the head and neck phantom with films, anthropomorphic phantom and lung phantom in supine and prone positions, respectively, then design treatment plans and delivery those plans. Compare and analyze the radiation accuracy of the two different positions with E2E software.Results The cervical vertebra tracking accuracy in supine and prone positions is 0.77 and 0.87 mm, respectively, with a difference of 0.01 mm; for thoracic vertebra tracking, the accuracy is 0.78 and 0.76 mm, respectively, with a difference of 0.02 mm; for lumbar vertebra, 0.89 and 0.80 mm, respectively with a difference of 0.09 mm; and for sacral vertebrae, 1.90 and 2.27 mm, with a difference of 0.37 mm.Conclusion For the three static phantoms, the differences of spine tracking accuracy between supine and prone position setups are very small. Therefore the accuracy in the two different positions can be considered equal.
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Received: 15 September 2015
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. [J]. , 2017, 26(3): 279-281. |
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