SU-E-T-405: A Whole-Procedure Winston-Lutz Test for Quality Assurance of a Bite- Block Based Extend Frame System for Delivering Multi-Session Stereotactic Radiosurgery

Medical Physics

Abstract

To develop a whole-procedure Winston-Lutz (WL) test method to determine the full system accuracy of a vacuum-assisted bite-block based frame system for multi-fraction Gamma Knife radiosurgery in reference to standard metal frame based single fraction delivery. A patient- specific bite-block frame was first modified to incorporate a pin mark and a slanted film holder. Using actual treatment protocol, a frame-indexed CT study was obtained and a treatment plan was developed accordingly. Then a film was placed and exposed to the pin-point position as identified per plan. To minimize signal noise for the exposed film where isodose distributions were mostly non-spherical, a band of peripheral dose distribution in the range of 40%-60% of central dose was extracted and then the average center-of-mass position from the dose band was measured and compared against the pin-point position. The test was carried out for initial system commissioning as well as patient-specific quality assurance measurements. Unlike traditional WL test where the border of an exposed field must be precisely demarcated, our current procedure eliminates such requirement via averaging a peripheral band of measured point cloud. The final result was more robust again...Continue Reading

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