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Filmless MLC Quality Assurance in Robotic Radiosurgery
Jacob A. Gersh, PhD DABR
Presented at the 2016 Radiosurgery Society Scientific Meeting
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Disclosures
Speaker is the owner and president of Spectrum Medical Physics, LLC, which has contracts or financial interest with: Standard Imaging Inc. Siemens Medical Integrated Medical Technologies
Speaker received financial reimbursement for travel
associated with the presentation presented herein (Standard Imaging Inc).
Presented at the 2016 Radiosurgery Society Scientific Meeting
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QA StereoCheckerTM
Filmless CyberKnife® QA System
High-Resolution Flat-Panel Imager
200 micron Resolution High Frame Rate Portable and Compact
Presented at the 2016 Radiosurgery Society Scientific Meeting
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QA StereoCheckerTM
Aligned using implanted high-Z markers Automated alignment using treatment
localization system Fast and consistent setup No manual manipulation of robot No attachment to collimator housing Designed to be used by physicists and therapists
Presented at the 2016 Radiosurgery Society Scientific Meeting
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The InCiseTM MLC
Available for CyberKnife M6 26 leaf pairs 0.385 mm wide at 800 mm Full over-travel Allows for treatment of larger lesions 100 mm x 115 mm Leaf Position Accuracy ≤0.95 mm
Presented at the 2016 Radiosurgery Society Scientific Meeting
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MLC QA – The Garden Fence Test
Less than 5 minutes Replaces visual film-based
tests Replaces monthly Garden
Fence Tests Capable of detecting 0.2
mm leaf variations
Presented at the 2016 Radiosurgery Society Scientific Meeting
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MLC QA – The Garden Fence Test
Presented at the 2016 Radiosurgery Society Scientific Meeting
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MLC QA – The Garden Fence Test
Presented at the 2016 Radiosurgery Society Scientific Meeting
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MLC QA – The Garden Fence Test
Presented at the 2016 Radiosurgery Society Scientific Meeting
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MLC QA – The Garden Fence Test
Presented at the 2016 Radiosurgery Society Scientific Meeting
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MLC QA – The Garden Fence Test
Presented at the 2016 Radiosurgery Society Scientific Meeting
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MLC QA – The Garden Fence Test
Presented at the 2016 Radiosurgery Society Scientific Meeting
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MLC QA – The Garden Fence Test
0.1mm 0.2mm 0.3mm 0.4mm 0.6mm 0.8mm 1.0mm
Induced Individual leaf errors 0.1 mm to 1.0 mm Increments of 0.1 mm
“Detection” occurs if a cluster of pixels is simultaneously above a threshold with SNR above 10.
Mean pixel difference values are used as “Warning” and “Error Thresholds” as well as for trend analysis.
Presented at the 2016 Radiosurgery Society Scientific Meeting
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Thank You
J. David Myers, CMD Michael Starnes, CMD Ryan S. Dubose, MS DABR Kevin L. Shay, MS DABR Daniel B. Fried, MD PHD Melanie Rhyne, RT Abby Sammut, RT Lauren Miles, RT LinLee Khoune, RT
Presented at the 2016 Radiosurgery Society Scientific Meeting
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Questions?
Presented at the 2016 Radiosurgery Society Scientific Meeting