1. Effect of Magnetic Resonance Imaging on the Motion Accuracy of Magnetic Resonance Imaging-compatible Focused Ultrasound Robotic System
- Author
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Anastasia Antoniou, Nikolas Evripidou, Antreas Chrysanthou, Leonidas Georgiou, Cleanthis Ioannides, Kyriakos Spanoudes, and Christakis Damianou
- Subjects
compatibility ,focused ultrasound ,motion accuracy ,magnetic resonance thermometry ,robotic system ,slice thickness ,Medical physics. Medical radiology. Nuclear medicine ,R895-920 - Abstract
Purpose: The current study provides insights into the challenges of safely operating a magnetic resonance imaging (MRI)-guided focused ultrasound (MRgFUS) robotic system in a high-field MRI scanner in terms of robotic motion accuracy. Materials and Methods: Grid sonications were carried out in phantoms and excised porcine tissue in a 3T MRI scanner using an existing MRgFUS robotic system. Fast low-angle shot-based magnetic resonance thermometry was employed for the intraprocedural monitoring of thermal distribution. Results: Strong shifting of the heated spots from the intended points was observed owing to electromagnetic interference (EMI)-induced malfunctions in system’s operation. Increasing the slice thickness of the thermometry sequence to at least 8 mm was proven an efficient method for preserving the robotic motion accuracy. Conclusions: These findings raise awareness about EMI effects on the motion accuracy of MRgFUS robotic devices and how they can be mitigated by employing suitable thermometry parameters.
- Published
- 2024
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