Abstract
Purpose
Computer-aided surgery is used in musculoskeletal tumor procedures to improve the surgeon’s orientation to local anatomy during tumor resection. For the navigation system to function correctly, preoperative imaging (e.g., CT, MR) must be registered to the patient in the operating room. The goals of this study were (1) to directly quantify registration accuracy in computer-aided tumor surgery and (2) to validate the “system reported error” (SRE) of the navigation system.
Methods
Registration accuracy was evaluated in eight bone sarcoma cases by determining the location of the anatomical paired-points used for registration following surface matching. Coordinates of specific intraoperative post-registration points were compared with the corresponding coordinates in preoperative CT scans to determine the measurement error (ME).
Results
The mean difference between post-registration points and planned registration points was \(12.21 \pm 6.52\,\hbox {mm}\), significantly higher than the mean SRE (\(0.68 \pm 0.15\,\hbox {mm}\); \(p=0.002\); 95 % CI 6.11–16.96 mm). The SRE poorly correlated with the calculated ME (\(R^2=0.040\)). Anatomical paired-point registration with surface matching results in a substantial shift in the post-registration coordinates of the same paired-points used for registration, and this shift is not represented by the SRE.
Conclusion
The SRE of a surgical navigation system was poorly correlated with direct measurements obtained in musculoskeletal tumor surgery. Improvement in registration accuracy is needed to better navigate tumor boundaries and ensure clear margins while maximally preserving the unaffected tissues and reducing operative morbidity.
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Abbreviations
- CATS:
-
Computer-aided tumor surgery
- CT:
-
Computed tomography
- ME:
-
Measurement error
- MR:
-
Magnetic resonance
- PET:
-
Positron emission tomography
- \(R^{2}\) :
-
Coefficient of determination
- SD:
-
Standard deviation
- SRE:
-
System reported error
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Acknowledgments
We would like to thank Seattle Children’s Hospital and the American Cancer Society for supporting this study.
Conflict of interest
Kurt Stoll, Joan Miles, Jedediah White, Stephanie Punt, Ernest Conrad, and Randal Ching declare no conflict of interest regarding the publication of this paper.
Informed consent
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008.
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Stoll, K.E., Miles, J.D., White, J.K. et al. Assessment of registration accuracy during computer-aided oncologic limb-salvage surgery. Int J CARS 10, 1469–1475 (2015). https://doi.org/10.1007/s11548-014-1146-1
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DOI: https://doi.org/10.1007/s11548-014-1146-1