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<p>Monitoring peripheral circulation is crucial for the early detection of peripheral artery disease (PAD) and diabetic foot complications. In this study, we analyzed the phase distribution of pulse wave signals on the dorsum of the foot using remote photoplethysmography (rPPG), a non-contact, non-invasive measurement method. We captured images of the dorsum of the foot under green light using an industrial camera and created phase color maps from the pixel-by-pixel rPPG signals. The results revealed a phenomenon in which the phase reversed by approximately 180 degrees between adjacent regions in the central part of the dorsum and near the ankle. This phase reversal likely reflects the mechanical deformation (compression and expansion) of the dermis associated with subcutaneous arterial dilation, suggesting that the phase difference in rPPG could be used to non-invasively estimate the location of arterial course.</p>

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Analysis of the distribution of the dorsal foot artery using pulse wave signals captured by a camera

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月20日

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  • Hibiki Endo,
  • Masato Takahashi,
  • Norimichi Tsumura

摘要

Monitoring peripheral circulation is crucial for the early detection of peripheral artery disease (PAD) and diabetic foot complications. In this study, we analyzed the phase distribution of pulse wave signals on the dorsum of the foot using remote photoplethysmography (rPPG), a non-contact, non-invasive measurement method. We captured images of the dorsum of the foot under green light using an industrial camera and created phase color maps from the pixel-by-pixel rPPG signals. The results revealed a phenomenon in which the phase reversed by approximately 180 degrees between adjacent regions in the central part of the dorsum and near the ankle. This phase reversal likely reflects the mechanical deformation (compression and expansion) of the dermis associated with subcutaneous arterial dilation, suggesting that the phase difference in rPPG could be used to non-invasively estimate the location of arterial course.