The impact of audio-visual biofeedback with a patient-specific guiding waveform on respiratory motion management: Comparison of two different respiratory management systems

Y. Nakajima, N. Kadoya, S. Kida, K. Ito, T. Kanai, K. Kishi, K. Sato, S. Dobashi, K. Takeda, H. Matsushita, K. Jingu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Irregular breathing can influence the outcome of four-dimensional computed tomography imaging for causing artifacts. Audio–visual biofeedback systems associated with patient-specific guiding waveform are known to reduce respiratory irregularities. In Japan, abdomen and chest motion selfcontrol devices (Abches), representing simpler visual coaching techniques without guiding waveform are used instead; however, no studies have compared these two systems to date. Here, we evaluate the effectiveness of respiratory coaching to reduce respiratory irregularities by comparing two respiratory management systems. We collected data from eleven healthy volunteers. Bar and wave models were used as audio–visual biofeedback systems. Abches consisted of a respiratory indicator indicating the end of each expiration and inspiration motion. Respiratory variations were quantified as root mean squared error (RMSE) of displacement and period of breathing cycles. All coaching techniques improved respiratory variation, compared to free-breathing. Displacement RMSEs were 1.43 ± 0.84, 1.22 ± 1.13, 1.21 ± 0.86, and 0.98 ± 0.47 mm for free-breathing, Abches, bar model, and wave model, respectively. Freebreathing and wave model differed significantly (p < 0.05). Period RMSEs were 0.48 ± 0.42, 0.33 ± 0.31, 0.23 ± 0.18, and 0.17 ± 0.05 s for free-breathing, Abches, bar model, and wave model, respectively. For variation in both displacement and period, wave model was superior to free-breathing, bar model, and Abches. The average reduction in displacement and period RMSE compared with wave model were 27% and 47%, respectively. The efficacy of audio–visual biofeedback to reduce respiratory irregularity compared with Abches. Our results showed that audio–visual biofeedback combined with a wave model can potentially provide clinical benefits in respiratory management, although all techniques could reduce respiratory irregularities.

Original languageEnglish
Title of host publicationWorld Congress on Medical Physics and Biomedical Engineering, 2015
EditorsDavid A. Jaffray
PublisherSpringer Verlag
Pages587-590
Number of pages4
ISBN (Print)9783319193878
DOIs
Publication statusPublished - 2015
EventWorld Congress on Medical Physics and Biomedical Engineering, 2015 - Toronto, Canada
Duration: 2015 Jun 72015 Jun 12

Publication series

NameIFMBE Proceedings
Volume51
ISSN (Print)1680-0737

Other

OtherWorld Congress on Medical Physics and Biomedical Engineering, 2015
CountryCanada
CityToronto
Period15/6/715/6/12

Keywords

  • Audio–visual biofeedback
  • Four-dimensional CT
  • Radiotherapy
  • Respiratory motion management
  • Respiratory variation

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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