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Reducing set-up uncertainty in the Elekta Stereotactic Body Frame using Stealthstation software.
William H Hinson1, William T Kearns, Thomas L Ellis
1Department of Radiation Oncology, Wake Forest University, School of Medicine, Winston-Salem, North Carolina 27157, USA. whinson@wfubmc.edu
Technology in Cancer Research & Treatment
|May 31, 2007
Summary
A new method using Stealth technology improves patient positioning accuracy for stereotactic radiosurgery. This technique directly confirms patient alignment before treatment, reducing setup errors for extracranial targets.
Area of Science:
- Medical Physics
- Radiotherapy
- Image-Guided Therapy
Background:
- The Elekta Stereotactic Body Frame (SBF) enables extracranial target localization in stereotactic coordinate systems.
- Current methods for estimating positioning errors rely on indirect image fusion of CT scans.
- Accurate patient repositioning is critical for effective and safe stereotactic radiosurgery.
Purpose of the Study:
- To introduce and evaluate a novel repositioning methodology utilizing neurosurgical Stealth technology for direct confirmation of patient alignment.
- To quantify the accuracy and efficiency of this new method in stereotactic radiosurgery procedures.
- To reduce setup errors in extracranial stereotactic radiosurgery.
Main Methods:
- The study involved four extracranial stereotactic radiosurgery patients and a radiotherapy simulation phantom.
- Repositioning was performed using neurosurgical Stealth technology for direct alignment confirmation.
- Setup error was measured using fiducial localization, with confirmatory CT scans registered to initial scans to quantify shifts in the Gross Tumor Volume (GTV) isocenter.
Main Results:
- Alignment confirmation using Stealth technology took 5 to 10 minutes.
- Phantom studies demonstrated a reproducible accuracy of 0.6 mm for phantom-to-SBF alignment.
- Patient studies showed setup errors of 1.5 mm or less, confirming the method's efficacy.
Conclusions:
- The Stealth Station process allows for rapid and direct confirmation of patient alignment on the treatment table.
- This novel methodology significantly enhances the accuracy of patient positioning in extracranial stereotactic radiosurgery.
- The findings support the integration of Stealth technology for improved precision in image-guided radiotherapy.
