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KMID : 0384620060170030136
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Korean Journal of Medical Physics
2006 Volume.17 No. 3 p.136 ~ p.143
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Development of Error Analysis Program for Phase-based Respiratory Gating Radiation Therapy
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Song Ju-Young
Nah Byung-Sik
Yoon Mee-Sun
Chung Woong-Ki
Nam Taek-Keun
Ahn Sung-Ja
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Abstract
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The respiratory gating radiation therapy which Irradiates only in the stable respiratory period with analyzing the periodic motion of a reflective marker on the patient’’s abdomen has been applied to the precise radiation treatment in order to minimize the effect of organ motion induced by the respiration. This respiratory gating system establishes irradiation region using the amplitude-based or phase-based method. Although phase-based method Is preferred because of the stability in the real treatment conditions, it has some limits to explain the exact correlation between the marker motion and organ motion. Even when the variation of amplitude which can introduce target motion considered as an error is produced, the phase-based method has the possibility to irradiate including the error positions. In this study, the error analysis program was developed for the verification of the tumor position’’s variation correlated with the variation of marker’’s amplitude which can be occurred during a phase-based respiratory sating treatment. The analysis program was tested with a virtual treatment record file and with a record file using moving phantom which were modified considering the irregular amplitude’’s variation simulating the real clinical situations. In both cases, accurate discrimination of error points and error calculation were produced. When the treatment record files of a real patient were analyzed with the program, the accurate recognition and calculation of the error points were also verified. The analysis program developed in this study will be applied as a useful tool for the analysis of errors due to the irregular variation of patients’’ respiration during the phase-base respiratory gating radiation treatment.
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KEYWORD
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Respiratory gating radiation therapy, Phase, Amplitude
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