A capacitor dosimeter with disposable silicon-diode substrates for 4-MV X-ray beam detection in radiation therapy
To monitor patient-surface dose in intensity-modulated radiation therapy (IMRT), developed a novel capacitor dosimeter with a disposable USB-A mini-substrate consisting of a 0.22 μF capacitor and a silicon X-ray diode (Si-XD). The capacitor dosimeter consisted of a USB-A mini-substrate and a microc...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-09-01
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| Series: | Physics Open |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666032620300132 |
| _version_ | 1818906811547254784 |
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| author | Satoshi Yamaguchi Eiichi Sato Yoshiro Ieko Hisanori Ariga Kunihiro Yoshioka |
| author_facet | Satoshi Yamaguchi Eiichi Sato Yoshiro Ieko Hisanori Ariga Kunihiro Yoshioka |
| author_sort | Satoshi Yamaguchi |
| collection | DOAJ |
| description | To monitor patient-surface dose in intensity-modulated radiation therapy (IMRT), developed a novel capacitor dosimeter with a disposable USB-A mini-substrate consisting of a 0.22 μF capacitor and a silicon X-ray diode (Si-XD). The capacitor dosimeter consisted of a USB-A mini-substrate and a microcomputer dock. The capacitor in the substrate was charged to 3.30 V using the dock before 4 MV X-ray irradiation. The charging voltage was reduced by photocurrents flowing through the Si-XD during irradiation. After which the substrate was re-inserted into the dock, and the discharging voltage was measured. A Farmer-type ionization chamber (N30013, PTW) was used to convert the discharging voltages into absorbed dose (Gy). The IMRT study was performed using a custom-made head-neck phantom. The decrease in the charging voltage was found to be proportional to the X-ray dose, and the calibrated dose corresponded well to those obtained using the ionization chamber. The surface dose measured on the head-neck phantom were equivalent to those obtained from a treatment planning system. An inexpensive dosimeter with Si-XDs was developed, as a promising too. The results suggest for monitoring patient-surface dose during radiation therapy. |
| first_indexed | 2024-12-19T21:45:10Z |
| format | Article |
| id | doaj.art-87db02984dfd4636862074b8575ed13a |
| institution | Directory Open Access Journal |
| issn | 2666-0326 |
| language | English |
| last_indexed | 2024-12-19T21:45:10Z |
| publishDate | 2020-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Open |
| spelling | doaj.art-87db02984dfd4636862074b8575ed13a2022-12-21T20:04:34ZengElsevierPhysics Open2666-03262020-09-014100026A capacitor dosimeter with disposable silicon-diode substrates for 4-MV X-ray beam detection in radiation therapySatoshi Yamaguchi0Eiichi Sato1Yoshiro Ieko2Hisanori Ariga3Kunihiro Yoshioka4Department of Radiology, School of Medicine, Iwate Medical University, 2-1-1 Idaidori, Yahaba, Iwate, 028-3695, Japan; Corresponding author.Department of Physics, Iwate Medical University, 1-1-1 Idaidori, Yahaba, Iwate, 028-3694, JapanDepartment of Radiation Oncology, Iwate Medical University Hospital, Iwate Medical University, 2-1-1 Idaidori, Yahaba, Iwate, 028-3695, JapanDepartment of Radiation Oncology, Iwate Medical University Hospital, Iwate Medical University, 2-1-1 Idaidori, Yahaba, Iwate, 028-3695, JapanDepartment of Radiology, School of Medicine, Iwate Medical University, 2-1-1 Idaidori, Yahaba, Iwate, 028-3695, JapanTo monitor patient-surface dose in intensity-modulated radiation therapy (IMRT), developed a novel capacitor dosimeter with a disposable USB-A mini-substrate consisting of a 0.22 μF capacitor and a silicon X-ray diode (Si-XD). The capacitor dosimeter consisted of a USB-A mini-substrate and a microcomputer dock. The capacitor in the substrate was charged to 3.30 V using the dock before 4 MV X-ray irradiation. The charging voltage was reduced by photocurrents flowing through the Si-XD during irradiation. After which the substrate was re-inserted into the dock, and the discharging voltage was measured. A Farmer-type ionization chamber (N30013, PTW) was used to convert the discharging voltages into absorbed dose (Gy). The IMRT study was performed using a custom-made head-neck phantom. The decrease in the charging voltage was found to be proportional to the X-ray dose, and the calibrated dose corresponded well to those obtained using the ionization chamber. The surface dose measured on the head-neck phantom were equivalent to those obtained from a treatment planning system. An inexpensive dosimeter with Si-XDs was developed, as a promising too. The results suggest for monitoring patient-surface dose during radiation therapy.http://www.sciencedirect.com/science/article/pii/S2666032620300132Radiation dosimetersRadiation monitoringCataractSurface doseRadiotherapySemiconductors |
| spellingShingle | Satoshi Yamaguchi Eiichi Sato Yoshiro Ieko Hisanori Ariga Kunihiro Yoshioka A capacitor dosimeter with disposable silicon-diode substrates for 4-MV X-ray beam detection in radiation therapy Physics Open Radiation dosimeters Radiation monitoring Cataract Surface dose Radiotherapy Semiconductors |
| title | A capacitor dosimeter with disposable silicon-diode substrates for 4-MV X-ray beam detection in radiation therapy |
| title_full | A capacitor dosimeter with disposable silicon-diode substrates for 4-MV X-ray beam detection in radiation therapy |
| title_fullStr | A capacitor dosimeter with disposable silicon-diode substrates for 4-MV X-ray beam detection in radiation therapy |
| title_full_unstemmed | A capacitor dosimeter with disposable silicon-diode substrates for 4-MV X-ray beam detection in radiation therapy |
| title_short | A capacitor dosimeter with disposable silicon-diode substrates for 4-MV X-ray beam detection in radiation therapy |
| title_sort | capacitor dosimeter with disposable silicon diode substrates for 4 mv x ray beam detection in radiation therapy |
| topic | Radiation dosimeters Radiation monitoring Cataract Surface dose Radiotherapy Semiconductors |
| url | http://www.sciencedirect.com/science/article/pii/S2666032620300132 |
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