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

doi:10.14316/pmp.2013.24.3.135

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An, Yeo, Jung, Suh, Lee, Choi, Lee, and Lee: The Effect of Breathing Biofeedback on Breathing Reproducibility and Patient's Dose in Respiration-gated Radiotherapy

Original Article

Progress in Medical Physics 2013;24(3):135-139.

Published online: 17 September 2013

DOI: https://doi.org/10.14316/pmp.2013.24.3.135

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^§,

^∗Department of Radiation Oncology, Gachon University Gil Medical Center, Incheon, Korea

^†Department of Radiation Medicine, Loma Linda University Medical Center, Loma Linda, CA, USA

^‡Department of Physics, East Carolina University, Greenville, NC, USA

^§Department of Radiation Oncology, School of Medicine, Ewha Womans University, Seoul, Korea

Corresponding Author: Rena Lee, Department of Radiation Oncology, School of Medicine, Ewha Womans University, Mok5-dong, Yangcheon-gu, Seoul 158-710, Korea Tel:02)2650-2022, Fax:02)2654-0363 E-mail: heraash@hanmail.net

Received 27 September 2012 Accepted 2 September 2013

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We evaluated the effect of two kinds of breathing biofeedback technique such as audio-instruction and audiovisual 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 audiovisual 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.

Keywords: Respiration-gated radiotherapy, Breathing reproducibility, Breathing biofeedback technique

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Fig. 1.

The block diagram of this research.

Fig. 2.

The variation of IM between the first week's breathing data and the subsequent four weeks’ breathing data for two kinds of definition of IM such as (a) full motion range and (b) standard deviation of the position of marker.

Fig. 3.

The ratio of V₁₀₀ between the first week's breathing data and the subsequent four weeks’ breathing data for two kinds of definition of IM such as (a) full motion range and (b) standard deviation of the position of marker.

Fig. 4.

The patient's breathing data which has intermittently irregular breaths

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