Patient-Specific Quality Assurance in Pencil Beam Scanning by 2-Dimensional Array
Purpose: This study aimed to determine the characteristics of 2D ionization chamber array and the confidence limits of the gamma passing rate in pencil beam scanning proton therapy. Materials and Methods: The Varian ProBeam Compact spot-scanning system and the PTW OCTAVIUS 1500XDR array were used as...
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| Format: | Article |
| Language: | English |
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Particle Therapy Co-operative Group
2023-11-01
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| Series: | International Journal of Particle Therapy |
| Subjects: | |
| Online Access: | https://theijpt.org/doi/pdf/10.14338/IJPT-23-00016.1 |
| _version_ | 1797403152935288832 |
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| author | Nuttida Rawiwan, MSc Nichakan Chatchumnan, MSc Mananchaya Vimolnoch, PhD Sakda Kingkaew, MSc Sornjarod Oonsiri, PhD |
| author_facet | Nuttida Rawiwan, MSc Nichakan Chatchumnan, MSc Mananchaya Vimolnoch, PhD Sakda Kingkaew, MSc Sornjarod Oonsiri, PhD |
| author_sort | Nuttida Rawiwan, MSc |
| collection | DOAJ |
| description | Purpose: This study aimed to determine the characteristics of 2D ionization chamber array and the confidence limits of the gamma passing rate in pencil beam scanning proton therapy.
Materials and Methods: The Varian ProBeam Compact spot-scanning system and the PTW OCTAVIUS 1500XDR array were used as a proton therapy system and detector, respectively. Our methods consisted of 2 parts: (1) the characteristics of the detector were tested and (2) patient-specific quality assurance was performed and evaluated by gamma analysis using dose-difference and distance-to-agreement criteria of 3% and 2 mm, respectively, with 123 treatment plans in head and neck, breast, chest, abdomen, and pelvic regions.
Results: The PTW OCTAVIUS 1500XDR array had good reproducibility, uniformity, linearity, repetition rate, and monitor unit per spot within 0.1%, with accuracy, energy dependence, and measurement depth within 0.5%. The overall uncertainty of the PTW OCTAVIUS 1500XDR array was 2.49%. For field size and range shifter, using gamma analysis, the passing rate was 100%. The overall results of patient-specific quality assurance with the gamma evaluation were 98.9% ± 1.6% in 123 plans and confidence limit was 95.7%.
Conclusion: The PTW OTAVIUS 1500XDR offered effective performance in pencil beam scanning proton therapy. |
| first_indexed | 2024-03-09T02:34:20Z |
| format | Article |
| id | doaj.art-467e8710dde64a45be31cbd49d101b72 |
| institution | Directory Open Access Journal |
| issn | 2331-5180 |
| language | English |
| last_indexed | 2024-03-09T02:34:20Z |
| publishDate | 2023-11-01 |
| publisher | Particle Therapy Co-operative Group |
| record_format | Article |
| series | International Journal of Particle Therapy |
| spelling | doaj.art-467e8710dde64a45be31cbd49d101b722023-12-06T11:34:15ZengParticle Therapy Co-operative GroupInternational Journal of Particle Therapy2331-51802023-11-0110210511010.14338/IJPT-23-00016.1i2331-5180-10-2-105Patient-Specific Quality Assurance in Pencil Beam Scanning by 2-Dimensional ArrayNuttida Rawiwan, MSc0Nichakan Chatchumnan, MSc1Mananchaya Vimolnoch, PhD2Sakda Kingkaew, MSc3Sornjarod Oonsiri, PhD41 Medical Physics Program, Department of Radiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand2 Division of Radiation Oncology, Department of Radiology, King Chulalongkorn Memorial Hospital, Bangkok, Thailand2 Division of Radiation Oncology, Department of Radiology, King Chulalongkorn Memorial Hospital, Bangkok, Thailand2 Division of Radiation Oncology, Department of Radiology, King Chulalongkorn Memorial Hospital, Bangkok, Thailand2 Division of Radiation Oncology, Department of Radiology, King Chulalongkorn Memorial Hospital, Bangkok, ThailandPurpose: This study aimed to determine the characteristics of 2D ionization chamber array and the confidence limits of the gamma passing rate in pencil beam scanning proton therapy. Materials and Methods: The Varian ProBeam Compact spot-scanning system and the PTW OCTAVIUS 1500XDR array were used as a proton therapy system and detector, respectively. Our methods consisted of 2 parts: (1) the characteristics of the detector were tested and (2) patient-specific quality assurance was performed and evaluated by gamma analysis using dose-difference and distance-to-agreement criteria of 3% and 2 mm, respectively, with 123 treatment plans in head and neck, breast, chest, abdomen, and pelvic regions. Results: The PTW OCTAVIUS 1500XDR array had good reproducibility, uniformity, linearity, repetition rate, and monitor unit per spot within 0.1%, with accuracy, energy dependence, and measurement depth within 0.5%. The overall uncertainty of the PTW OCTAVIUS 1500XDR array was 2.49%. For field size and range shifter, using gamma analysis, the passing rate was 100%. The overall results of patient-specific quality assurance with the gamma evaluation were 98.9% ± 1.6% in 123 plans and confidence limit was 95.7%. Conclusion: The PTW OTAVIUS 1500XDR offered effective performance in pencil beam scanning proton therapy.https://theijpt.org/doi/pdf/10.14338/IJPT-23-00016.1two-dimensional ionization chamber arraypencil beam scanning proton therapypatient-specific quality assurance |
| spellingShingle | Nuttida Rawiwan, MSc Nichakan Chatchumnan, MSc Mananchaya Vimolnoch, PhD Sakda Kingkaew, MSc Sornjarod Oonsiri, PhD Patient-Specific Quality Assurance in Pencil Beam Scanning by 2-Dimensional Array International Journal of Particle Therapy two-dimensional ionization chamber array pencil beam scanning proton therapy patient-specific quality assurance |
| title | Patient-Specific Quality Assurance in Pencil Beam Scanning by 2-Dimensional Array |
| title_full | Patient-Specific Quality Assurance in Pencil Beam Scanning by 2-Dimensional Array |
| title_fullStr | Patient-Specific Quality Assurance in Pencil Beam Scanning by 2-Dimensional Array |
| title_full_unstemmed | Patient-Specific Quality Assurance in Pencil Beam Scanning by 2-Dimensional Array |
| title_short | Patient-Specific Quality Assurance in Pencil Beam Scanning by 2-Dimensional Array |
| title_sort | patient specific quality assurance in pencil beam scanning by 2 dimensional array |
| topic | two-dimensional ionization chamber array pencil beam scanning proton therapy patient-specific quality assurance |
| url | https://theijpt.org/doi/pdf/10.14338/IJPT-23-00016.1 |
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