Loughborough University, Department of Electronic and Electrical Engineering, Loughborough, Leicestershire, LE11 3TU, United Kingdom.
J Biomed Opt. 2011 Jul;16(7):077010. doi: 10.1117/1.3602852.
With the advance of computer and photonics technology, imaging photoplethysmography [(PPG), iPPG] can provide comfortable and comprehensive assessment over a wide range of anatomical locations. However, motion artifact is a major drawback in current iPPG systems, particularly in the context of clinical assessment. To overcome this issue, a new artifact-reduction method consisting of planar motion compensation and blind source separation is introduced in this study. The performance of the iPPG system was evaluated through the measurement of cardiac pulse in the hand from 12 subjects before and after 5 min of cycling exercise. Also, a 12-min continuous recording protocol consisting of repeated exercises was taken from a single volunteer. The physiological parameters (i.e., heart rate, respiration rate), derived from the images captured by the iPPG system, exhibit functional characteristics comparable to conventional contact PPG sensors. Continuous recordings from the iPPG system reveal that heart and respiration rates can be successfully tracked with the artifact reduction method even in high-intensity physical exercise situations. The outcome from this study thereby leads to a new avenue for noncontact sensing of vital signs and remote physiological assessment, with clear applications in triage and sports training.
随着计算机和光子技术的进步，成像光体积描记术（PPG，iPPG）可以在广泛的解剖位置上提供舒适和全面的评估。然而，运动伪影是当前 iPPG 系统的一个主要缺点，特别是在临床评估的情况下。为了克服这个问题，本研究引入了一种由平面运动补偿和盲源分离组成的新的伪影减少方法。通过在手部测量 12 名受试者在 5 分钟的自行车运动前后的心脏脉搏，评估 iPPG 系统的性能。此外，从单个志愿者身上采集了一个包含重复运动的 12 分钟连续记录协议。从 iPPG 系统捕获的图像中得出的生理参数（即心率、呼吸率）表现出与传统接触式 PPG 传感器相当的功能特征。iPPG 系统的连续记录表明，即使在高强度的体育锻炼情况下，使用伪影减少方法也可以成功地跟踪心率和呼吸率。本研究的结果为非接触式生命体征传感和远程生理评估开辟了新途径，在分诊和运动训练中有明确的应用。
