Development of a numerical simulator of human swallowing using a particle method (Part 2. Evaluation of the accuracy of a swallowing simulation using the 3D MPS method)

Kamiya, Tetsu; Toyama, Yoshio; Michiwaki, Yukihiro; Kikuchi, Toru

doi:10.1109/embc.2013.6610169

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…The MPS method, which can calculate fluid splashes and large transformations, has recently been used. Hence, MPS was proposed to simulate swallowing [10]; however, the simulation was not validated. In another case study, 2D MPS was used considering organ movements in VF images of swallowing [11].…”

Section: Introductionmentioning

confidence: 99%

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Development and Preliminary Validity Evaluation of Numerical Simulation of Human Swallowing Using a Particle Method

KAMIYA,

TOYAMA,

HANYU

et al. 2023

Japan J. Food Eng.

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This study evaluated the possibility of numerically simulation of swallowing via moving particle simulation (MPS), defining the bolus structure as the number of particles. To verify the accuracy of the simulation, a simplified bolus falling model was studied via three-dimensional (3D) MPS. Further, we examined a simplified swallowing simulation via two-dimensional (2D) MPS to verify interactions between food properties and organ structure movement. On comparing the 3D MPS simulation and experimental results, we found that the falling time of the water bolus and configuration of the liquidair interface corresponded to the experimental measurements and visualization images, respectively. Moreover, the calculated force on the surface was similar to the theoretical and measured values with adequate rheological and tribological properties. In the simplified 2D MPS swallowing simulation results, the food bolus exhibited different flow behaviors and deformations, thus confirming that MPS can be used for coupled simulations of food and organ structures with differing physical properties. The results suggest that MPS can be used to develop a numerical simulation of the swallowing process.

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Section: Introductionmentioning

confidence: 99%

“…These two fitting parameters are important, as they include rheological (flow and deformation) and tribological (friction and lubrication) effects. Normalized particle density N d , which is equivalent to the signals detected in the experiments, was defined based on the comparison of the experimental falling time as follows:(10)…”

mentioning

confidence: 99%

Development and Preliminary Validity Evaluation of Numerical Simulation of Human Swallowing Using a Particle Method

KAMIYA,

TOYAMA,

HANYU

et al. 2023

Japan J. Food Eng.

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“…The mainstream numerical simulations of the swallowing action include FEM and moving-particle simulation (MPS) methods. The MPS method was proposed to simulate the swallowing action 10,11) ; however, the simulation was not validated. Another case study used a two-dimensional (2D) MPS method, considering the organ movements in VF images during swallowing 12,13) .…”

Section: Introductionmentioning

confidence: 99%

Visualization of Aspiration due to Changes in Rheological and Tribological Parameters Using a Three-Dimensional Swallowing Simulator

Kamiya

Toyama

Hanyu

et al. 2023

J. Soc. Rheol., Jpn

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This study investigated the influence of the rheological and tribological parameters of a food bolus on the organ surface during swallowing. A swallowing simulator was developed based on a three-dimensional moving-particle simulation with a realistic human organ model. The simulator enables numerical comparisons using a standard human model based on food models with different rheological and tribological parameters. Through a parametric study, we can successfully characterize several aspiration patterns for low viscosity with high-density and high-viscosity food models. Our results revealed that the main cause of the before aspiration was the fast bolus arrival at the epiglottis and not the small particles. The results also revealed that to control the outbreak of the spray for aspiration restraints, it is important to control the lubrication of the bolus. This study is not a simple aspiration simulation. Moreover, it can contribute to building an evaluation system that connects the properties of a food bolus with the aspiration phenomenon without any medical radiation risks. Based on the results, we conclude that our swallowing simulator is a useful tool for estimating and evaluating the aspiration phenomena, including the relationship between human organ movement and rheological and tribological properties of the food and organ surface.

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“…Recently, there have been some reports on stereoscopic observations of swallowing. These studies used computed tomography (CT) (8,9,28), cine magnetic resonance imaging (17,25) and computational fluid dynamics (CFD) simulation (12,13,15,16,22,32). Inamoto et al (9), for example, analyzed the timing of the swallowing process, including the true vocal cord closure using CT, and concluded that the timing changes with viscosities.…”

Section: Introductionmentioning

confidence: 99%

A computational fluid dynamics simulation of liquid swallowing by impaired pharyngeal motion: bolus pathway and pharyngeal residue

Ohta

Ishida

Kawase

et al. 2019

American Journal of Physiology-Gastrointestinal and Liver Physi

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Common practices to improve the ability to swallow include modifying physical properties of foods and changing the posture of patients. Here, we quantified the effects of the viscosity of a liquid bolus and patient posture on the bolus pathway and pharyngeal residue using a computational fluid dynamics simulation. We developed a computational model of an impaired pharyngeal motion with a low pharyngeal pressure and no pharyngeal adaptation. We varied viscosities from 0.002 to 1 Pa·s and postures from −15° to 30° (from nearly vertical to forward leaning). In the absence of pharyngeal adaptation, a honey-like liquid bolus caused pharyngeal residue, particularly in the case of forward-leaning postures. Although the bolus speed was different among viscosities, the final pathway was only slightly different. The shape, location, and tilting of the epiglottis effectively invited a bolus to two lateral pathways, suggesting a high robustness of the swallowing process. NEW & NOTEWORTHY Thickening agents are often used for patients with dysphagia. An increase in bolus viscosity not only reduces the risk of aspiration but also can cause a residual volume in the pharynx. Because information obtained from videofluoroscopic swallowing studies is only two-dimensional, measurement of pharyngeal residue is experimentally difficult. We successfully quantified the three-dimensional bolus pathway and the pharyngeal residual volume using computational modeling and simulation.

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Development of a numerical simulator of human swallowing using a particle method (Part 2. Evaluation of the accuracy of a swallowing simulation using the 3D MPS method)

Cited by 9 publications

References 6 publications

Development and Preliminary Validity Evaluation of Numerical Simulation of Human Swallowing Using a Particle Method

Development and Preliminary Validity Evaluation of Numerical Simulation of Human Swallowing Using a Particle Method

Visualization of Aspiration due to Changes in Rheological and Tribological Parameters Using a Three-Dimensional Swallowing Simulator

A computational fluid dynamics simulation of liquid swallowing by impaired pharyngeal motion: bolus pathway and pharyngeal residue

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