Real-time liver motion compensation for MRgFUS

Area of Science:

• Medical Imaging
• Interventional Radiology
• Acoustic Surgery

Background:

• MR-guided focused ultrasound (MRgFUS) is effective for treating solid tumors like uterine fibroids.
• Organ motion in the liver prevents MRgFUS application due to the need for precise targeting.
• Existing methods lack real-time motion compensation for liver MRgFUS.

Purpose of the Study:

• To develop and validate a novel motion compensation method for MRgFUS liver lesion treatment.
• To enable continuous ultrasound energy delivery despite liver organ movement.
• To achieve sub-pixel accuracy in real-time liver lesion targeting.

Main Methods:

• Implementing a real-time feature tracking system to monitor salient anatomical landmarks (e.g., blood vessels).
• Utilizing a thin plate spline (TPS) interpolation scheme to update target coordinates based on tracked features.
• Validating the method on both synthetic datasets and MRI sequences from human subjects.

Main Results:

• Demonstrated sub-pixel tracking accuracy for liver motion compensation.
• Achieved per-feature tracking times of 5.7ms ± 1.6ms, suitable for real-time MRgFUS.
• Successfully adapted MRgFUS for potential liver lesion treatment by addressing organ motion.

Conclusions:

• The developed motion compensation technique enables MRgFUS application in the liver.
• This method allows for precise, real-time targeting of liver lesions during non-invasive ablation.
• This innovation expands the therapeutic potential of MRgFUS to abdominal organs.