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Development of a bio-inspired mechatronic chest wall simulator for evaluating the performances of opto-electronic plethysmography.

C M, E S, F B, A S, P S, G L, F B, S A S, S S - Open Biomed Eng J (2014)

Bottom Line: The design of the simulator is based on the chest wall kinematic analysis of three healthy subjects previously determined.Results show that the CWS allows simulating respiratory frequency up to ~ 60 bpm.The observed good performances permit to consider the CWS prototype feasible to be employed for assessing the performances of OEP system in periodical validation routines.

View Article: PubMed Central - PubMed

Affiliation: Unit of Measurements and Biomedical Instrumentation, Center for Integrated Research, Università Campus Bio-Medico di Roma, Via Álvaro del Portillo, 21, 00128 Rome, Italy.

ABSTRACT
Instrumented gait analysis based on optoelectronic systems is an expensive technique used to objectively measure the human movement features and it is generally considered as the gold standard. Opto-electronic plethysmography (OEP) is a particular motion analysis system able to: (i) determine chest wall kinematic via the evaluation of marker displacements placed on the thorax and (ii) compute respiratory volumes during breathing. The aim of this work is to describe the performances of a custom made, bio-inspired, mechatronic chest wall simulator (CWS), specifically designed to assess the metrological performances of the OEP system. The design of the simulator is based on the chest wall kinematic analysis of three healthy subjects previously determined. Two sets of experiments were carried out: (i) to investigate the CWS dynamic response using different target displacements (1 - 12 mm), and (ii) to assess the CWS accuracy and precision in simulating quite breathing, covering the physiological range of respiratory frequency and tidal volume. Results show that the CWS allows simulating respiratory frequency up to ~ 60 bpm. The difference between the actual displacement and the set one is always < 9 μm. The precision error, expressed as the ratio between measurement uncertainty and the actual displacement, is lower than 0.32 %. The observed good performances permit to consider the CWS prototype feasible to be employed for assessing the performances of OEP system in periodical validation routines.

No MeSH data available.


Opto-electronic plethysmography: 89 marker setup as in [41, 43]. (a) 37 anterior markers, (b) 5 lateral markers (left) (c) 5 lateral markers (right) (d) 42 posterior markers.
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Figure 1: Opto-electronic plethysmography: 89 marker setup as in [41, 43]. (a) 37 anterior markers, (b) 5 lateral markers (left) (c) 5 lateral markers (right) (d) 42 posterior markers.

Mentions: The most commonly used set up for the acquisition both in the standing and sitting position [42-44] consists of 89 markers: seven horizontal and five vertical lines (Fig. 1a, 1d), two medium-axillary (Fig. 1b, 1c), and seven extra markers arranged in anatomical structures between the sternal notch and the clavicles to the level of the anterior superior iliac crest, being 37 anterior (Fig. 1a), 42 posterior (Fig. 1d) and 10 lateral (Fig. 1b, 1c) markers.


Development of a bio-inspired mechatronic chest wall simulator for evaluating the performances of opto-electronic plethysmography.

C M, E S, F B, A S, P S, G L, F B, S A S, S S - Open Biomed Eng J (2014)

Opto-electronic plethysmography: 89 marker setup as in [41, 43]. (a) 37 anterior markers, (b) 5 lateral markers (left) (c) 5 lateral markers (right) (d) 42 posterior markers.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4302486&req=5

Figure 1: Opto-electronic plethysmography: 89 marker setup as in [41, 43]. (a) 37 anterior markers, (b) 5 lateral markers (left) (c) 5 lateral markers (right) (d) 42 posterior markers.
Mentions: The most commonly used set up for the acquisition both in the standing and sitting position [42-44] consists of 89 markers: seven horizontal and five vertical lines (Fig. 1a, 1d), two medium-axillary (Fig. 1b, 1c), and seven extra markers arranged in anatomical structures between the sternal notch and the clavicles to the level of the anterior superior iliac crest, being 37 anterior (Fig. 1a), 42 posterior (Fig. 1d) and 10 lateral (Fig. 1b, 1c) markers.

Bottom Line: The design of the simulator is based on the chest wall kinematic analysis of three healthy subjects previously determined.Results show that the CWS allows simulating respiratory frequency up to ~ 60 bpm.The observed good performances permit to consider the CWS prototype feasible to be employed for assessing the performances of OEP system in periodical validation routines.

View Article: PubMed Central - PubMed

Affiliation: Unit of Measurements and Biomedical Instrumentation, Center for Integrated Research, Università Campus Bio-Medico di Roma, Via Álvaro del Portillo, 21, 00128 Rome, Italy.

ABSTRACT
Instrumented gait analysis based on optoelectronic systems is an expensive technique used to objectively measure the human movement features and it is generally considered as the gold standard. Opto-electronic plethysmography (OEP) is a particular motion analysis system able to: (i) determine chest wall kinematic via the evaluation of marker displacements placed on the thorax and (ii) compute respiratory volumes during breathing. The aim of this work is to describe the performances of a custom made, bio-inspired, mechatronic chest wall simulator (CWS), specifically designed to assess the metrological performances of the OEP system. The design of the simulator is based on the chest wall kinematic analysis of three healthy subjects previously determined. Two sets of experiments were carried out: (i) to investigate the CWS dynamic response using different target displacements (1 - 12 mm), and (ii) to assess the CWS accuracy and precision in simulating quite breathing, covering the physiological range of respiratory frequency and tidal volume. Results show that the CWS allows simulating respiratory frequency up to ~ 60 bpm. The difference between the actual displacement and the set one is always < 9 μm. The precision error, expressed as the ratio between measurement uncertainty and the actual displacement, is lower than 0.32 %. The observed good performances permit to consider the CWS prototype feasible to be employed for assessing the performances of OEP system in periodical validation routines.

No MeSH data available.