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Comparison study of intraoperative surface acquisition methods on registration accuracy for soft-tissue surgical
Bowen Xiang1,2, Jon S Heiselman1,2,3, Winona L Richey1,2
1Vanderbilt University, Department of Biomedical Engineering, Nashville, Tennessee, United States.
Journal of Medical Imaging (Bellingham, Wash.)
|March 6, 2024
Summary
Nonrigid registration improved accuracy in liver surgery navigation compared to rigid registration. While noncontact Conoprobe acquisition showed promise, its benefits were limited by data coverage and noise.
Area of Science:
- Medical Imaging
- Surgical Navigation
- Computer-Assisted Surgery
Background:
- Image-guided surgery relies on accurate registration between preoperative images and the patient's anatomy.
- Traditional methods often use contact-based digitization, which can be cumbersome and time-consuming.
- Noncontact methods offer potential advantages in speed and ease of use during surgery.
Purpose of the Study:
- To compare rigid registration versus nonrigid registration techniques.
- To evaluate contact (stylus) versus noncontact (Conoprobe) digitization methods for liver surgery.
- To assess the impact of these methods on image-to-physical registration accuracy.
Main Methods:
- Developed a sterile-field compatible Conoprobe for noncontact intraoperative organ surface data acquisition.
- Compared Conoprobe data with stylus-based contact data in liver resection patients.
- Evaluated registration accuracy using rigid registration (RRM), nonrigid registration (NRM), and NRM with ultrasound data (NRM-VC).
Main Results:
- Nonrigid registration methods (NRM and NRM-VC) significantly outperformed rigid registration.
- NRM-VC showed improvement over RRM by 4.48 mm (stylus) and 3.66 mm (Conoprobe).
- Despite differences in data coverage and noise, contact and noncontact methods yielded similar registration results.
Conclusions:
- Nonrigid registration significantly enhances accuracy in image-guided liver surgery compared to rigid registration.
- Noncontact surface acquisition using Conoprobe is feasible in the operating room for liver surgery.
- The accuracy benefits of noncontact acquisition were limited by lower data coverage and system noise.
