Monte Carlo for CyberKnife Incise TM MLC
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1 Division of Medical Radiation Physics Monte Carlo for CyberKnife Incise TM MLC Division of Medical Radiation Physics and Department of Radiation Oncology, Inselspital, Bern University Hospital, and University of Bern, Switzerland
2 Disclosure & Disclaimer An honorarium is provided by Accuray for this presentation The views expressed in this presentation are those of the presenters and do not necessarily reflect the views or policies of Accuray Incorporated or its subsidiaries. No official endorsement by Accuray Incorporated or any of its subsidiaries of any vendor, products or services contained in this presentation is intended or should be inferred.
3 Outline CyberKnife M6 System at the Inselspital Bern Commissioning Evaluation In-house independent MC dose calculation (IDC) for InCise MLC Evaluation Benchmarking of MC dose calculation for InCise MLC Summary
4 CyberKnife M6 System at the Inselspital Bern 2014: Installation of CyberKnife M6 System. May 2014: Start of patient treatments. July 2015: Installation of InCise MLC. August 2017: CyberKnife -11 Upgrade (requirement for the use of Monte Carlo (MC) for the InCise MLC).
5 CyberKnife M6 System at the Inselspital Bern
6 Commissioning Finite Size Pencil Beam (FSPB) algorithm must be commissioned before starting with MC commissioning. No additional data/measurements required for the MC MLC algorithm. Estimated time needed for commissioning: 3-5 days.
7 Commissioning - Workflow FSPB MC START Define Source Model (FWHM, Energy) Calculate TPR Calculate OCR Calculate OF ok ok Inselspital Bern: FWHM = 2.0 mm Energy = 6.3 MeV Compare calc. vs meas. TPR Compare calc. vs meas. OCR Compare calc. vs meas. OF ok FINISH nok nok nok
8 Evaluation In-house independent MC dose calculation (IDC) for InCise MLC Geometry model of the CyberKnife System equipped with the InCise MLC Ref: P.-H. Mackeprang et al., "Independent Monte-Carlo dose calculation for MLC based CyberKnife radiotherapy", Phys. Med. Biol. 63, 2018.
9 Evaluation In-house independent MC dose calculation (IDC) for InCise MLC Model is validated with measurements. Ref: P.-H. Mackeprang et al., "Independent Monte-Carlo dose calculation for MLC based CyberKnife radiotherapy", Phys. Med. Biol. 63, 2018.
10 Evaluation In-house independent MC dose calculation (IDC) for InCise MLC An MC-based modular IDC-Framework was successfully developed, implemented and validated against measurements and is now available to perform patient-specific QA. Ref: P.-H. Mackeprang et al., "Independent Monte-Carlo dose calculation for MLC based CyberKnife radiotherapy", Phys. Med. Biol. 63, 2018.
11 Evaluation Benchmarking of MC dose calculation for InCise MLC IDC - Framework COMPARISON Precision Dose distributions in water 11 rectangular MLC field sizes TPR, OCR Dose distributions in lung phantom (CIRS Thorax Phantom) Single MLC field Dose distributions in patients 2 prostate cases 7 lung cases Calculation time
12 Evaluation Benchmarking of MC dose calculation for InCise MLC Dose distributions in water -> OCR x mm 2 Framework and Precision depth = 1.5 cm Agreement between IDC 7.6 x 7.7 mm 2 within 3.1% / 1 mm x 46.2 mm 2 Measurement xxx IDC Framework Precision
13 Evaluation Benchmarking of MC dose calculation for InCise MLC Dose distributions in water -> TPR Measurement xxx IDC Framework Precision Agreement between IDC Framework and Precision within 2.3% / 1 mm x mm x 46.2 mm x 7.7 mm 2
14 Evaluation Benchmarking of MC dose calculation for InCise MLC Dose distributions in lung phantom (CIRS Thorax Phantom) Precision IDC Framework Dose difference
15 Evaluation Benchmarking of MC dose calculation for InCise MLC Dose distributions in patients (lung case) Dose difference Gamma (2% / 1 mm)
16 Evaluation Benchmarking of MC dose calculation for InCise MLC Dose distributions in patients
17 Evaluation Benchmarking of MC dose calculation for InCise MLC Calculation time
18 Evaluation Benchmarking of MC dose calculation for InCise MLC
19 Summary Once the FSPB algorithm is commissioned, no additional beam data measurements are needed in order to commission the MC algorithm for the InCise MLC. An in-house independent dose calculation framework (IDC- Framework) was developed and validated against measurements. The accuracy of the MC algorithm within Precision was evaluated by comparing it with the IDC-Framework. The calculation time for a clinically reasonable dose distribution with Monte Carlo is typically below one hour.
20 Thank you for your attention!
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Stereotactic Body Radiotherapy for Lung Lesions using the CyberKnife of-the-art and New Innovations
Stereotactic Body Radiotherapy for Lung Lesions using the CyberKnife State-of of-the-art and New Innovations Chad Lee, PhD CK Solutions, Inc. and CyberKnife Centers of San Diego Outline Basic overview
New CyberKnife M6 Service at HKSH for Cancer Patients Shorter Treatment Time, Fewer Side Effects and Improved Patient Outcomes
For Immediate Release New CyberKnife M6 Service at HKSH for Cancer Patients Shorter Treatment Time, Fewer Side Effects and Improved Patient Outcomes (13 August 2017, Hong Kong) Hong Kong Sanatorium & Hospital
Journal extended Abstracts FL-AAPM Spring Meeting April 28-30, 2017, Orlando FL
PSMMP PUBLICATIONS 2017 A GPU accelerated simulation annealing algorithm for IMRT optimization, P. Galanakou, T. Leventouri, A. Georgakilas, G. Kalantzis, (IEEE proc. SNPD 2017). A Novel Test to Verify
Intensity Modulated Radiation Therapy: Dosimetric Aspects & Commissioning Strategies
Intensity Modulated Radiation Therapy: Dosimetric Aspects & Commissioning Strategies ICPT School on Medical Physics for Radiation Therapy Justus Adamson PhD Assistant Professor Department of Radiation