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KMID : 1164220150270020123
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Journal of Korean Society for Radiotherapeutic Technology
2015 Volume.27 No. 2 p.123 ~ p.129
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A study on the accuracy of source position in HDR brachytherapy according to the curvature of Universal applicator transfer tube and applicator type
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Shin Hyun-Kyung
Lee Sang-Kyu
Kim Joo-Ho
Cho Jeong-Hee
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Abstract
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Purpose : The goal of this study was to verify and analyze the source position according to the curvature of the universal
applicator and 4 different angle applicators when using RALS(Remote After Loading System).
Materials and Methods : An interval of 1 cm and 15 second dwell times in each source position were applied for plan. To
verify the accuracy of source position, we narrowed the distance between MultiSource container and GAFCHROMIC? EBT3
film by 5 cm, 10 cm, 20 cm so that the universal applicator transfer tube had some curvature. Also 4 applicators(Intrauterine tube: 0°, 15°, 30°, Ovoid tube: 65°) were used in the same condition. The differences between desired and actual source position were measured by using Image J.
Results : In case of using 4 different angles of applicator with the straight universal applicator transfer tube, the average error was the lowest for 0°applicator, greatest for 65°applicator. However, All average errors were within ±2 mm recommended in TG-56. When MultiSource container was moved 5 cm, 10 cm, 20 cm towards the EBT3 film, the average errors were beyond ±2 mm. The first dwell position was relatively located in accuracy, while the second and third dwells were displaced by an increasing magnitude with increasing curvature of the transfer tube. Furthermore, with increasing the angle of applicators, the error of all other dwell positioning was increased.
Conclusion : The results of this study showed that both the curvature of universal applicator transfer tube and the angle of
applicators affect the source dwell position. It is recommended that using straight universal applicator transfer tubes is followed in all cases, in order to avoid deviations in the delivered source dwell position. Also, It is advisable to verify the actual dwell position, using video camera quality control tool prior to all treatments.
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KEYWORD
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High Dose Rate Brachytherapy, Quality Assurance(QA), Source position verification, Remote After Loading System(RALS)
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