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Isocenter accuracy in frameless stereotactic radiotherapy using implanted fiducials.
Ki-Hwan Kim1, Moon-June Cho, Jun-Sang Kim
1Department of Therapeutic Radiology, Chungnam National University, Taejon, South Korea.
Summary
Frameless stereotactic radiotherapy (SRT) using implanted cranial gold markers demonstrates highly reliable isocenter accuracy. This system is comparable to other stereotactic radiosurgery techniques for intracranial tumors.
Area of Science:
- Medical Physics
- Neurosurgery
- Radiation Oncology
Background:
- Stereotactic radiotherapy (SRT) systems require precise isocenter verification for accurate patient treatment.
- Frameless SRT offers advantages but necessitates robust methods for ensuring positional accuracy.
Purpose of the Study:
- To evaluate the isocenter accuracy of a frameless SRT system.
- To assess the reliability of implanted cranial gold markers as fiducials in frameless SRT.
Main Methods:
- Frameless SRT was performed on 43 intracranial tumor patients.
- Isocenter accuracy was assessed using implanted cranial gold markers and ISOLOC software.
- Orthogonal port films were used to calculate isocenter deviations.
Main Results:
- Mean isocenter deviations were minimal (-0.03, 0.14, -0.04 mm).
- Systematic and random isocenter standard deviations were within acceptable ranges (0.28-0.35 mm and 0.50-0.53 mm, respectively).
Conclusions:
- The frameless SRT system with implanted fiducials provides highly reliable isocenter accuracy.
- This accuracy is comparable to established stereotactic radiosurgery systems.