Determination of detection depth of optical probe in pedicle screw measurement device

BioMedical Engineering OnLine

Weitao Li¹  Yangyang Liu¹  Zhiyu Qian¹ 

[1] Department of Biomedical Engineering, Nanjing University of Aeronautics and Astronautics, Yudao Street, Nanjing, China

关键词: Navigation;    Near infrared spectra;    Pedicle screw;    Detection depth;   

Others  :  1084242
DOI  :  10.1186/1475-925X-13-148

 received in 2014-07-24, accepted in 2014-10-22,  发布年份 2014

【 摘 要 】

Background

There is a high probability of accidental perforation of the vertebral pedicle wall in pedicle screw insertion surgery. A pedicle screw (PS) measurement device with an optical probe has been reported to send out a warning signal before the PS tip breaking the vertebral pedicle wall.

Methods

In this study, we explored the detection depth of optical probe in this measurement device, which was closely related to the effective alarm distance. In the boundary, the vertebrae tissues could be treated as 2-layer models including spongy bones and compact bones. The Monte Carlo simulation and phantom models were performed to analyse and define the detection depth. Then the porcine vertebrae models were performed to obtain optical spectrum and reduced scattering coefficient, based on which the detection depths were deduced. Moreover, a comparison was made to explore the most significant pattern factor from the experiment results.

Results

According to the pattern factor, an alarm threshold was successfully deduced to define the alarm distance during pedicle screw monitoring.

Conclusions

Thus, the proposed alarm standard based on detection depth provides a potential for guiding pedicle screw in surgery.

【 授权许可】

   
2014 Li et al.; licensee BioMed Central Ltd.

【 图 表 】

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