The Effect of Breathing Biofeedback on Breathing Reproducibility and Patient's Dose in Respiration-gated Radiotherapy

Sohyun An; Inhwan Yeo; Jaewon Jung; Hyunsuk Suh; Kyung Ja Lee; Jinho Choi; Kyu Chan Lee; Rena Lee

Article

Original Article

Korean Journal of Medical Physics 2013; 24(3): 135-139

Published online September 30, 2013

The Effect of Breathing Biofeedback on Breathing Reproducibility and Patient's Dose in Respiration-gated Radiotherapy

호흡연동 방사선 치료에서 호흡생체자기제어 방식이 호흡 재현성 및 선량에 미치는 영향 평가

Sohyun An^*, Inhwan Yeo^†, Jaewon Jung^‡, Hyunsuk Suh^§, Kyung Ja Lee^§, Jinho Choi^*, Kyu Chan Lee^*, Rena Lee^§

안소현^*ㆍ여인환^†ㆍ정재원^‡ㆍ서현숙^§ㆍ이경자^§ㆍ최진호^*ㆍ이규찬^*ㆍ이레나^§

Author Info ⁺

^*Department of Radiation Oncology, Gachon University Gil Medical Center, Incheon, Korea, ^†Department of Radiation Medicine, Loma Linda University Medical Center, Loma Linda, CA, ^‡Department of Physics, East Carolina University, Greenville, NC, USA, ^§Department of Radiation Oncology, School of Medicine, Ewha Womans University, Seoul, Korea

^*가천대학교 길병원 방사선종양학과, ^†Department of Radiation Medicine, Loma Linda University Medical Center, ^‡Department of Physics, East Carolina University, ^§이화여자대학교 의과대학 방사선종양학교실

Abstract

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Abstract

We evaluated the effect of two kinds of breathing biofeedback technique such as audio-instruction and audio-visual biofeedback on breathing reproducibility and the CTV coverage during repeated treatment regimes in respiration-gated radiotherapy. In this study, the breathing data of nineteen lung cancer patients acquired from Medical College of Virginia (MCV) during five weeks were used. The dose evaluation algorithm was programmed in MATLAB. In the result, the CTV coverage was decreased as 30.0% due to the breathing irreproducibility for free-breathing. For audio-visual biofeedback, the CTV coverage was improved as 20.0% because patients can learn how control their breathing stably. And the audio-instruction was effective to preserve the breathing reproducibility.

KeywordsRespiration-gated radiotherapy, Breathing reproducibility, Breathing biofeedback technique