Image-guided laparoscopic pelvic lymph node dissection using stereo visual tracking free-hand laparoscopic ultrasound

Area of Science:

• Minimally Invasive Surgery
• Medical Imaging
• Surgical Navigation

Background:

• Laparoscopic pelvic lymph node dissection is challenging due to obscured pelvic arteries.
• Inaccurate artery identification risks accidental damage during surgery.
• Existing methods lack real-time, precise guidance for critical anatomical structures.

Purpose of the Study:

• To develop and validate an image-guided navigation system for improved laparoscopic pelvic lymph node dissection.
• To enhance surgical safety and efficiency by providing accurate pelvic artery localization.
• To simplify system setup and reduce operative time through an innovative tracking strategy.

Main Methods:

• Developed a system registering a 3D CT-derived artery model with a 3D laparoscopic ultrasound model.
• Employed a stereo vision-based tracking strategy for ultrasound probe localization.
• Utilized a local phase-based snakes framework for artery segmentation in ultrasound images.

Main Results:

• The navigation system demonstrated high accuracy in phantom experiments, with a 1.58 ± 0.70 mm target registration error (TRE).
• Feasibility was confirmed through successful application in an animal model.
• The stereo vision tracking simplified system setup and reduced setup time.

Conclusions:

• The developed image-guided navigation system significantly improves the safety and efficiency of laparoscopic pelvic lymph node dissection.
• Accurate pelvic artery visualization is achievable using integrated CT and free-hand ultrasound imaging.
• The system offers a promising solution for complex minimally invasive procedures involving critical vascular structures.