Electromagnetic navigation improves minimally invasive robot-assisted lung brachytherapy.

Area of Science:

• Thoracic Surgery
• Medical Robotics
• Image-Guided Therapy

Background:

• Minimally invasive thoracic surgery advances have increased interest in interstitial brachytherapy for lung cancer.
• Previous minimally invasive robot-assisted (MIRA) lung brachytherapy systems showed comparable or superior results to standard video-assisted thoracic surgery (VATS).

Purpose of the Study:

• To evaluate the performance of an integrated system for MIRA lung brachytherapy.
• This system incorporates modified electromagnetic navigation and ultrasound image guidance with robotic assistance.

Main Methods:

• An experimental test-bed included VATS, surgical robotic arms (ZEUS, AESOP), a seed injector, ultrasound, and custom electromagnetic navigational software.
• The MIRA IV system integrated these components, with inactive brachytherapy seeds injected towards a target in an agar cube.
• Procedure completion time, number of attempts, and seed placement accuracy were compared across manual placement, standard VATS, MIRA III, and MIRA IV.

Main Results:

• MIRA IV reduced median procedure time by 61% and tissue trauma by 75% compared to standard VATS.
• MIRA IV decreased mean seed placement error by 64% versus standard VATS and 68% versus MIRA III.
• Compared to MIRA III, MIRA IV reduced mean procedure time by 48%.

Conclusions:

• A novel integrated system (MIRA IV) for minimally invasive robot-assisted lung brachytherapy was developed.
• The system features electromagnetic navigation and an enhanced robotic controller.
• MIRA IV demonstrated significantly improved performance over standard VATS and the MIRA III system.