KMID : 1164220100220020135
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Journal of Korean Society for Radiotherapeutic Technology 2010 Volume.22 No. 2 p.135 ~ p.144
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Production and Assessing Usefulness of the Moving Phantom for Respiration Gated Radiotherapy
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Lee Yang-Hoon
Lee Je-Hee Yoo Suk-Hyun
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Abstract
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Purpose: The purpose of this study is that through production of phantom for respiration gated radiotherapy, assessing appropriacy of exposure dose for the therapy using RPM (Real-time Position Management).
Materials and Methods: We located measurement object on the phantom for respiration gated radiotherapy made of 2 linear actuator, acrylic panel, stanchion, iron plate ets. to drive (up, down, front, back). Using 4D CT scan, we analyzed patient¡¯s respiration and reproduced the movement by computer. On the phantom, we located a 2D-Array (PTW) and an White water phantom (4.5 cm) and used DMLC (interval 2 cm) in the field size 10¡¿10 cm , then exposed 21EX X-ray 100 MU, in the case of phantom was (1) static (2) moving (3) gated using RPM respectively gantry 0¡Æ and 90¡Æ We measured with a 0.125 CC ionization chamber (PTW) on the phantom (7.5 cm) in the same condition.
Results: Ionization chamber: There were within 0.3% of error with gating respiration and approximately 2% of error without gating in the same condition. 2D-Array: Gantry 90¡Æ, field size 10¡¿10 cm, using DMLC. There were within 3% of error with gating respiration and approximately 16% of error without gating.
Conclusion: The phantom for respiration gated radiotherapy makes plans considering patient¡¯s movement, quantitative analysis of exposure dose and proper assessment therapy for IMRT patients using RPM possible.
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KEYWORD
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moving phantom, IGRT Q.A, IMRT Q.A, RPM
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