Development of a Quality Assurance Phantom for Brachytherapy: The Feasibility of Daily Check with the Phantom
| Autor: | Kiyotaka Kakei, Yuji Nakaguchi, Tetsuo Saito, Masato Maruyama, Eriko Takenaga, Ryuji Murakami, Masahiro Hashida, Nozomu Nagasue, Yudai Kai |
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| Rok vydání: | 2014 |
| Předmět: |
Dosimeter
Materials science Quality Assurance Health Care Phantoms Imaging business.industry medicine.medical_treatment Brachytherapy General Medicine Radiation Dosage Imaging phantom Particle detector Semiconductor detector Mockup Ionization chamber medicine Humans Female Radiometry business Nuclear medicine Genital Diseases Female Quality assurance |
| Zdroj: | Japanese Journal of Radiological Technology. 70:34-40 |
| ISSN: | 1881-4883 0369-4305 |
| DOI: | 10.6009/jjrt.2014_jsrt_70.1.34 |
| Popis: | Purpose We developed a quality assurance (QA) phantom to enable easy confirmation of radiation source output measurements of a high dose rate (192)Ir intracavitary brachytherapy unit in gynecology. The purpose of this study was to evaluate the feasibility of daily checks using the QA phantom. Methods and materials The QA phantom was designed with tough water phantoms to hold a Farmer-type ionization chamber, with semiconductor detectors used as in vivo dosimeters to measure rectal dose, and three transfer tubes for gynecology. To test the reliability of our QA phantom for the detection of abnormalities in source output or semiconductor detectors, we applied different doses. Results Variations due to different settings of the QA phantom were within 2%. The temporal variations were less than 2% and 5% in the Farmer-type ionization chamber and semiconductor detectors, respectively. Interobserver variations were below 3%. Conclusions With tolerance levels of 2% and 5% for a Farmer-type ionization chamber and semiconductor detectors, respectively, a QA phantom is potentially useful for easily detecting abnormalities by applying daily checks of the brachytherapy unit. |
| Databáze: | OpenAIRE |
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