Prog Med Phys.  2013 Sep;24(3):135-139. 10.14316/pmp.2013.24.3.135.

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

• An S
• Yeo I
• Jung J
• Suh H
• Lee KJ
• Choi J
• Lee KC
• Lee R

• KMID: 1910576
• DOI: http://doi.org/10.14316/pmp.2013.24.3.135

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.

Keyword

Respiration-gated radiotherapy; Breathing reproducibility; Breathing biofeedback technique

MeSH Terms

Biofeedback, Psychology*
Humans
Lung Neoplasms
Radiotherapy*
Respiration*
Virginia

Figure

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  Fig. 1. The block diagram of this research.

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  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.

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  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.

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  Fig. 4. The patient's breathing data which has intermittently irregular breaths

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