title: [Experimental study of three dimensional navigation assisted spinal surgery by multi-segment registration technology based on structured light scanning].
abstract: OBJECTIVE
  To study the registration method based on structured light scanning for navigation assisted spinal surgery and assess its accuracy so as to construct a registration system for the navigation assisted spinal surgery using structured light scanning.
  
  
  METHODS
  Both the computed tomographic (CT) dataset and the structured light scanning images of thoracic vertebra were obtained. The pre-registration and multi-segment iterative closest point (ICP) algorithm were used for the registration of CT images and structured light images. Four segmentations were selected from the surface of thoracic vertebra and placed into different combinations. The accuracy for each combination was studied. Noise and perturbation were exerted to structured light and registration accuracy was studied. And calf vertebra was used for further verification.
  
  
  RESULTS
  A combination of pre-registration and multi-segment iterative closest point (ICP) algorithm was competent for the registration of CT scanning data and the structured light scanning data. The registration error was less than 1 mm when two and more segments were selected for registration combination. The registration error was less than 1 mm when noise was exerted.
  
  
  CONCLUSIONS
  With a high accuracy and a perturbation resistance, a combination of pre-registration and multi-segment registration algorithm based on structured light scanning is competent for the registration of CT scanning data and structured light scanning data.
authors: Department of Orthopedics, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing 100730, China. lishugang@medmail.com.cn
authors: Shu-Gang
authors: SG
authors: Li
authors: Gui-Xing
authors: GX
authors: Qiu
authors: Bin
authors: B
authors: Feng
authors: Si-Yi
authors: SY
authors: Cai
authors: Lin
authors: L
authors: Sheng
authors: Ji-Liang
authors: JL
authors: Zhai
authors: Jin-Qian
authors: JQ
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