Measurement of chest wall motion using a motion capture system with the one-pitch phase analysis method

Abstract

Spirometry is a standard method for assessing lung function. However, its use is challenging in some patients, and it has limitations such as risk of infection and inability to assess regional chest wall motion. A three-dimensional motion capture system using the one-pitch phase analysis (MCO) method can facilitate high precision measurement of moving objects in real-time in a non-contacting manner. In this study, the MCO method was applied to examine thoraco-abdominal (TA) wall motion for assessing pulmonary function. We recruited 48 male participants, and all underwent spirometry and chest wall motion measurement with the MCO method. A significant positive correlation was observed between the vital capacity (Spearman’s ρ = 0.68, p < 0.0001), forced vital capacity (Spearman’s ρ = 0.62, p < 0.0001), and tidal volume (Spearman’s ρ = 0.61, p < 0.0001) of spirometry and the counterpart parameters of MCO method. Moreover, the MCO method could detect regional rib cage and abdomen compartment contributions and could assess TA asynchrony, indicating almost complete synchronous movement (phase angle for each compartment: − 5.05° to 3.86°). These findings suggest that this technique could examine chest wall motion, and may be effective in analyzing chest wall volume changes and pulmonary function.

Breathing Chest Wall Kinematics Assessment through a Single Digital Camera: A Feasibility Study

“…Results show that the proposed non-contact system allows for the estimation of f R values and temporal parameters (i.e., T i , T e , and T tot ) that are comparable with those of wearable systems (e.g., a bias of −0.2 bpm for f R and 0.01 s for T tot as reported in [ 15 , 43 ]) as well as with those of non-contact technologies (e.g., LOAs of ±5 bpm and of ±3.4 bpm for f R , as reported in [ 22 , 44 ]). Considering all the estimated time-related respiratory parameters, we achieved comparable results in terms of median and IQR with those obtained in [ 24 ] (e.g., a median of 13.43 bpm in our work and a median of 16.0 bpm in Tamiya et al). Considering the analysis of the respiratory-asynchrony-related parameters, the results show that the values of PA and PS estimated from signals retrieved from the video are quite comparable with those of the reference system.…”

“…Then, the signals were filtered with a bandpass filter between 0.01 Hz and 1 Hz. The first 60 s of the signals were used to compute the time-related respiratory parameters (i.e., f R , T i , T e , and T tot ) [ 24 ]. In addition, an explorative assessment of thoraco-abdominal asynchrony was performed by computing the PA and PS [ 9 ].…”

“…In both cases, these technologies require time-consuming and extensive processing of data in order to obtain the information of interest. In this scenario, digital cameras are gaining much interest thanks to their ease of availability, non-invasiveness, and low cost for detecting respiratory activity by framing the upper body without any contact with the subject and evaluating respiratory-related parameters [ 21 , 22 , 23 , 24 , 25 ]. However, it is worth noting that there have been limited research studies that have utilized digital cameras, including RGB cameras found in smartphones, PCs, and professional cameras [ 26 , 27 , 28 , 29 ], to capture thoraco-abdominal movements [ 22 , 30 ].…”

Novel Surface Topographic Assessment of Lung Volume and Pulmonary Function Tests in Idiopathic Scoliosis: A Preliminary Study

“…4,16 This has led to the development of tests that provide alternative methods for assessing pulmonary volumes such as depth cameras, microwave-based technologies, optical and motion capture systems, computed tomography (CT), and magnetic resonance imaging (MRI). [17][18][19][20][21][22] Surface topography (ST) is a noninvasive method for evaluating a patient's body morphology and has previously been demonstrated to have excellent reliability in evaluating body volumes in patients with idiopathic scoliosis. 23 However, there has been limited evaluation of ST's ability to evaluate pulmonary lung volumes.…”

“…Many patient populations have difficulty performing spirometry due to the inability to follow directions, difficulty wearing the nose or mouthpieces, or poor tolerance for the prolonged periods of deep breathing required for the test 4,16 . This has led to the development of tests that provide alternative methods for assessing pulmonary volumes such as depth cameras, microwave-based technologies, optical and motion capture systems, computed tomography (CT), and magnetic resonance imaging (MRI) 17–22 …”