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SU-E-J-40: Lung Lesion Tracking Using Fixed-Spaced Non-Migrating Fiducial Markers in Robotic Radiosurgery.
J Gersh1,2, K Reynolds1,2, M DeWeese1,2
1Mid-South Radiation Physics, Paragould, AR.
Medical Physics
|May 19, 2017
Summary
This study evaluated a new system for placing fiducial markers for CyberKnife (CK) radiosurgery. The system successfully tracked markers of various sizes and spacing, crucial for precise lung lesion treatment.
Area of Science:
- Medical Physics
- Radiosurgery Technology
- Image-Guided Therapy
Background:
- Accurate targeting is crucial for CyberKnife (CK) robotic radiosurgery, especially for lung lesions.
- The CK's stereoscopic kV imaging system relies on tracking implanted fiducial markers for precise radiation delivery.
Purpose of the Study:
- To evaluate a novel fixed-space fiducial marker delivery system for CK radiosurgery.
- To test the CK's treatment localization system's (TLS) ability to track fiducial markers of varying size and spacing.
Main Methods:
- A novel system delivered two VISICOIL fiducial markers simultaneously via a single 20-gauge needle.
- Markers of 3.5mm and 5.0mm length (5mm diameter) were spaced at 15mm, 17mm, and 20mm in a lung phantom.
- Stereoscopic kV imaging was compared to digitally reconstructed radiographs (DRRs) for tracking accuracy.
Main Results:
- The CK's TLS successfully tracked all tested marker configurations using standard lung imaging parameters.
- Longer markers were excluded due to potential tracking inaccuracies without natural deformation upon implantation.
Conclusions:
- This preliminary study demonstrates the feasibility of tracking fiducial markers delivered by the novel system.
- Further research can now determine the minimum marker spacing for accurate CK TLS tracking in phantom treatments.
