AbstractObjective To investigate the effects of spine region of interest (ROI), tracking range, and real-time image contrast ratio on the positioning errors of cyberknife. Methods The LTT dynamic phantom was used to develop a spine tracking plan and perform treatment, and the target positioning system was used to preset the phantom and obtain real-time preset image and positioning error. Based on the real-time preset image, spine ROI, tracking range, and real-time image contrast ratio were changed to observe the changes in positioning error and related parameters. Pearson correlation analysis was performed. Results The change in tracking range did not change the positioning error in spine tracking, and tracking range was not correlated with positioning error (R=0, P=1). The changes in ROI and image contrast ratio did not affect the translation error, but affected the rotation error, especially the rotation error in left-right direction (r=0.533 and 0.693, P=0.002 and 0.026). The image contrast ratio had the most obvious effect, with an amplitude of variation up to 2.2°. Conclusions The change in tracking range does not affect the positioning errors in spinal tracking, but the changes in ROI and image contrast ratio can cause varying degrees of changes in positioning errors, which should be taken seriously in cyberknife treatment.
Zhao Rui,Wang Zhenyue,Li Sha et al. Effects of spine tracking parameters on the positioning errors of cyberknife[J]. Chinese Journal of Radiation Oncology, 2016, 25(5): 504-507.
Zhao Rui,Wang Zhenyue,Li Sha et al. Effects of spine tracking parameters on the positioning errors of cyberknife[J]. Chinese Journal of Radiation Oncology, 2016, 25(5): 504-507.
[1]陈光耀.CyherKnife放射外科治疗规范[M].上海:学林出版社,2008:23-30. Chen GY.Specification for CyherKnife radiation therapy[M].Shanghai:Xue Lin Publishing House,2008:23-30. [2]Fürweger C,Drexler C,Kufeld M,et al. Advances in fiducial-free image-guidance for spinal radiosurgery with CyberKnife-a phantom study[J].J Appl Med Phys,2011,12(2):3446. [3]李延,张军华,李栋,等.第四代射波刀常见问题分析与处理[J].医疗卫生装备,2013,34(6):134-135.DOI:10.7687/J.ISSN1003-8868.2013.06.134. Li Y,Zhang CH,Li D,et al. Analysis and treatment of the common problems of the fourth generation radio wave cutter[J].Chin Med Equip J,2013,34(6):134-135.DOI:10.7687/J.ISSN1003-8868.2013.06.134. [4]沈君姝,耿薇娜,王朋,等.射波刀追踪方式分析[J].生物医学工程与临床,2011,15(5):502-504. Shen JSH,Geng WN,Wang P,et al. CyberKnife tracking mode analysis[J].Biomed Eng Clin Med,2011,15(5):502-504. [5]王境生,李丰彤,董洋,等.射波刀Xsight患者六维方向数据分析[J].医疗卫生装备,2012,33(2):128-129.DOI:10.3969/j.issn.1003-8868.2012.02.050. Wang JS,Li FT,Dong Y,et al. Six-dimensional orientation data analysis of patients tracked by Cyber Knife Xsight[J].Chin Med Equip J,2012,33(2):128-129.DOI:10.3969/j.issn.1003-8868.2012.02.050. [6]徐慧军,李玉,张素静,等.G4射波刀物理技术方面的质量保证[J].中国现代医药杂志,2013,15(2):1-4.DOI:10.3969/j.issn.1672-9463.2013.02.001. Xu HJ,Li Y,Zhang SJ,et al. Quality assurance of G4 CyberKnife in physics aspect[J].Mod Med J China,2013,15(2):1-4.DOI:10.3969/j.issn.1672-9463.2013.02.001. [7]赵瑞,王震岳,李莎,等.射波刀影像追踪中X射线曝光条件对脊柱追踪错误节点及辐射剂量的影响[J].中华放射医学与防护杂志,2014,34(2):133-135.DOI:10.3760/cma.j.issn.0254-5098.2014.02.014. Zhao R,Wang ZY,Li S,et al. Effect of X-ray exposure parameters on the false-node rate and radiation dose in CyberKnife spine tracking[J].Chin J Radiol Med Prot,2014,34(2):133-135.DOI:10.3760/cma.j.issn.0254-5098.2014.02.014. [8]赵瑞,李中华,王震岳,等.射波刀脊柱追踪系统胸椎追踪定位问题的分析[J].中国医疗设备,2014,29(7):116-117,146.DOI:10.3969/j.issn.1674-1633.2014.07.043. Zhao R,Li ZH,Wang ZY,et al. Analysis of problems exsiting in the tracking and positioning process of thoracic vertebrae with Cyberknife spine tracking system[J].China Med Dev,2014,29(7):116-117,146.DOI:10.3969/j.issn.1674-1633.2014.07.043. [9]Ho AK,Fu D,Cotrutz C,et al. A study of the accuracy of cyberknife spinal radiosurgery using skeletal structure tracking[J].Neurosurgery,2007,60(2 Suppl 1):147-156.DOI:10.1227/01.NEU.0000249248.55923.EC.
2016, Vol. 25 
