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AngleNav: MEMS Tracker to Facilitate CT-Guided Puncture

Abstract

As a low-cost needle navigation system, AngleNav may be used to improve the accuracy, speed, and ease of CT-guided needle punctures. The AngleNav hardware includes a wireless device with a microelectromechanical (MEMS) tracker that can be attached to any standard needle. The physician defines the target, desired needle path and skin entry point on a CT slice image. The accuracy of AngleNav was first tested in a 3D-printed calibration platform in a benchtop setting. An abdominal phantom study was then performed in a CT scanner to validate the accuracy of the device’s angular measurement. Finally, an in vivo swine study was performed to guide the needle towards liver targets (n = 8). CT scans of the targets were used to quantify the angular errors and needle tip-to-targeting distance errors between the planned needle path and the final needle position. The MEMS tracker showed a mean angular error of 0.01° with a standard deviation (SD) of 0.62° in the benchtop setting. The abdominal phantom test showed a mean angular error of 0.87° with an SD of 1.19° and a mean tip-to-target distance error of 4.89 mm with an SD of 1.57 mm. The animal experiment resulted in a mean angular error of 6.6° with an SD of 1.9° and a mean tip-to-target distance error of 8.7 mm with an SD of 3.1 mm. These results demonstrated the feasibility of AngleNav for CT-guided interventional workflow. The angular and distance errors were reduced by 64.4 and 54.8% respectively if using AngleNav instead of freehand insertion, with a limited number of operators. AngleNav assisted the physicians to deliver accurate needle insertion during CT-guided intervention. The device could potentially reduce the learning curve for physicians to perform CT-guided needle targeting.

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Acknowledgments

NIH does not endorse or recommend any commercial products, processes, or services. The content of this manuscript does not necessarily reflect the views or policies of the Department of Health and Human Services, nor do mention of trade names, commercial products, or organizations imply endorsement by the USA Government. This work was supported by the Center for Interventional Oncology in the Intramural Research Program of the National Institutes of Health (NIH), grants 1ZIDBC011242 and 1ZIDCL040015.

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Correspondence to Zion Tsz Ho Tse.

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Associate Editor Agata A. Exner oversaw the review of this article.

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Li, R., Xu, S., Pritchard, W.F. et al. AngleNav: MEMS Tracker to Facilitate CT-Guided Puncture. Ann Biomed Eng 46, 452–463 (2018). https://doi.org/10.1007/s10439-017-1968-4

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Keywords

  • CT-guided biopsy or ablation
  • MEMS sensor
  • Tracker
  • Angular tracking