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Lewis DJ, Taylor PA, Followill DS, Sahoo N, Mahajan A, Stingo FC, Kry SF. A New Anthropomorphic Pediatric Spine Phantom for Proton Therapy Clinical Trial Credentialing. Int J Part Ther 2018; 4:20-27. [PMID: 30214913 DOI: 10.14338/ijpt-17-00024.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Purpose To design and evaluate an anthropomorphic spine phantom for use in credentialing proton therapy facilities for clinical trial participation by the Imaging and Radiation Oncology Core Houston QA Center. Materials and Methods A phantom was designed to perform an end-to-end audit of the proton spine treatment process, including simulation, dose calculation, and proton treatment delivery. Because plastics that simulate bone in proton beams are unknown, 11 potential materials were tested to identify suitable phantom materials. Once built, preliminary testing using passive scattering and spot scanning treatment plans (including a field junction) were created in-house and delivered 3 times to test reproducibility. The following measured attributes were compared with the calculated values: absolute dose agreement using thermoluminescent dosimeters, planar gamma agreement, distal range, junction match, and right and left profile alignment using radiochromic film. Finally, credentialing results from 10 institutions were also assessed. Results A suitable bone substitute was identified (Techtron HPV Bearing Grade), which had a measured relative stopping power that agreed within 1.1% of its value calculated by Eclipse. In-house passive scatter testing of the phantom demonstrated that the phantom was suitable for assessing craniospinal irradiation dose delivery. However, the in-house scanning beam results were more mixed, highlighting challenges in treatment delivery. Seven of ten institutions passed the proposed criteria for this phantom, a pass rate consistent with other Imaging and Radiation Oncology phantoms. Conclusions An anthropomorphic proton spine phantom was developed to evaluate proton therapy delivery. This phantom provides a realistic challenge for centers wishing to participate in proton clinical trials and highlights the need for caution in applying advanced treatments.
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Affiliation(s)
- Dana J Lewis
- Imaging and Radiation Oncology Core Quality Assurance Office, Houston, TX, USA.,Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,The University of Texas Health Science Center Houston, Graduate School of Biomedical Sciences, Houston TX, USA
| | - Paige A Taylor
- Imaging and Radiation Oncology Core Quality Assurance Office, Houston, TX, USA.,Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,The University of Texas Health Science Center Houston, Graduate School of Biomedical Sciences, Houston TX, USA
| | - David S Followill
- Imaging and Radiation Oncology Core Quality Assurance Office, Houston, TX, USA.,Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,The University of Texas Health Science Center Houston, Graduate School of Biomedical Sciences, Houston TX, USA
| | - Narayan Sahoo
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,The University of Texas Health Science Center Houston, Graduate School of Biomedical Sciences, Houston TX, USA
| | - Anita Mahajan
- The University of Texas Health Science Center Houston, Graduate School of Biomedical Sciences, Houston TX, USA.,Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Francesco C Stingo
- The University of Texas Health Science Center Houston, Graduate School of Biomedical Sciences, Houston TX, USA.,Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Stephen F Kry
- Imaging and Radiation Oncology Core Quality Assurance Office, Houston, TX, USA.,Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,The University of Texas Health Science Center Houston, Graduate School of Biomedical Sciences, Houston TX, USA
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Liao L, Lim GJ, Li Y, Yu J, Sahoo N, Li H, Gillin M, Zhu XR, Mahajan A, Frank SJ, Grosshans DR, Nguyen QN, Gomez D, Zhang X. Robust Optimization for Intensity Modulated Proton Therapy Plans with Multi-Isocenter Large Fields. Int J Part Ther 2016; 3:305-311. [PMID: 31772982 DOI: 10.14338/ijpt-16-00012.1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 08/10/2016] [Indexed: 12/27/2022] Open
Abstract
We have developed a robust optimization approach for intensity modulated proton therapy treatment plans with multi-isocenter large fields. The method creates a low-gradient field dose in the junction regions to mitigate the impact caused by misalignment errors and is more efficient than the conventional junction shifting technique.
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Affiliation(s)
- Li Liao
- Department of Industrial Engineering, The University of Houston, Houston, TX, USA
| | - Gino J Lim
- Department of Industrial Engineering, The University of Houston, Houston, TX, USA
| | - Yupeng Li
- Applied Research, Varian Medical Systems, Palo Alto, CA, USA
| | - Juan Yu
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Maryland Proton Treatment Center, Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Narayan Sahoo
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Heng Li
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Michael Gillin
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - X Ronald Zhu
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Anita Mahajan
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Steven J Frank
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - David R Grosshans
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Quynh-Nhu Nguyen
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Daniel Gomez
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Xiaodong Zhang
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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