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Briot N, Chagnon G, Connesson N, Payan Y. In vivo measurement of breast tissues stiffness using a light aspiration device. Clin Biomech (Bristol, Avon) 2022; 99:105743. [PMID: 36099706 DOI: 10.1016/j.clinbiomech.2022.105743] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 08/12/2022] [Indexed: 02/07/2023]
Abstract
BACKGROUND This paper addresses the question of the in vivo measurement of breast tissue stiffness, which has been poorly adressed until now, except for elastography imaging which has shown promising results but which is still difficult for clinicians to use on a day-to-day basis. Estimating subject-specific tissue stiffness is indeed a critical area of research due to the development of a large number of Finite Element (FE) breast models for various medical applications. METHODS This paper proposes to use an original aspiration device, put into contact with breast surface, and to estimate tissue stiffness using an inverse analysis of the aspiration experiment. The method assumes that breast tissue is composed of a bilayered structure made of fatty and fribroglandular tissues (lower layer) superimposed with the skin (upper layer). Young moduli of both layers are therefore estimated based on repeating low intensity suction tests (<40 mbar) of breast tissues using cups of 7 different diameters. FINDINGS Seven volunteers were involved in this pilot study with average Young moduli of 56.3 kPa ± 16.4 and 3.04 kPa ± 1.17 respectively for the skin and the fatty and fibroglandular tissue. The measurements were carried out in a reasonable time scale (<60 min in total) without any discomfort perceived by the participants. These encouraging results should be confirmed in a clinical study that will include a much larger number of volunteers and patients.
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Hérault J, Gérard A, Carnicer A, Aloi D, Peyrichon ML, Barnel C, Vidal M, Angellier G, Fayaud D, Grini JC, Giusto A, Armando C, Donadey G, Cabannes M, Dumas S, Payan Y, Di Carlo JF, Salicis C, Bergerot JM, Rolion M, Trimaud R, Hofverberg P, Mandrillon P, Sauerwein W, Thariat J. 30 years of ocular proton therapy, the Nice view. Cancer Radiother 2022; 26:1016-1026. [PMID: 35803860 DOI: 10.1016/j.canrad.2022.03.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 03/15/2022] [Indexed: 11/08/2022]
Abstract
PURPOSE Radiotherapy with protons (PT) is a standard treatment of ocular tumors. It achieves excellent tumor control, limited toxicities, and the preservation of important functional outcomes, such as vision. Although PT may appear as one homogenous technique, it can be performed using dedicated ocular passive scattering PT or, increasingly, Pencil Beam Scanning (PBS), both with various degrees of patient-oriented customization. MATERAIAL AND METHODS MEDICYC PT facility of Nice are detailed with respect to their technical, dosimetric, microdosimetric and radiobiological, patient and tumor-customization process of PT planning and delivery that are key. 6684 patients have been treated for ocular tumors (1991-2020). Machine characteristics (accelerator, beam line, beam monitoring) allow efficient proton extraction, high dose rate, sharp lateral and distal penumbrae, and limited stray radiation in comparison to beam energy reduction and subsequent straggling with high-energy PBS PT. Patient preparation before PT includes customized setup and image-guidance, CT-based planning, and ocular PT software modelling of the patient eye with integration of beam modifiers. Clinical reports have shown excellent tumor control rates (∼95%), vision preservation and limited toxicity rates (papillopathy, retinopathy, neovascular glaucoma, dry eye, madarosis, cataract). RESULTS Although demanding, dedicated ocular PT has proven its efficiency in achieving excellent tumor control, OAR sparing and patient radioprotection. It is therefore worth adaptations of the equipments and practice. CONCLUSIONS Some of these adaptations can be transferred to other PT centers and should be acknowledeged when using non-PT options.
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Briot N, Chagnon G, Burlet L, Gil H, Girard E, Payan Y. Experimental characterisation and modelling of breast Cooper's ligaments. Biomech Model Mechanobiol 2022; 21:1157-1168. [PMID: 35482144 PMCID: PMC9047630 DOI: 10.1007/s10237-022-01582-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 03/25/2022] [Indexed: 11/24/2022]
Abstract
The aim of this study was to characterise the mechanical behaviour of Cooper's ligaments. Such ligaments are collagenous breast tissue that create a three-dimensional structure over the entire breast volume. Ten ligaments were extracted from a human cadaver, from which 28 samples were cut and used to perform uniaxial tensile tests. Histological analysis showed that the main direction of the fibres visible to the naked eye corresponds to the orientation of the fibres on a microscopic scale. The specimens were cut according to this orientation, which allowed the sample to be stretched in the main fibre direction. From these experimental stretch/stress curves, an original anisotropic hyperelastic constitutive law is proposed to model the behaviour of Cooper's ligaments and the material parameter validity is discussed.
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Kappert KDR, Connesson N, Elahi SA, Boonstra S, Balm AJM, van der Heijden F, Payan Y. In-vivo tongue stiffness measured by aspiration: Resting vs general anesthesia. J Biomech 2020; 114:110147. [PMID: 33276256 DOI: 10.1016/j.jbiomech.2020.110147] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 11/16/2020] [Accepted: 11/21/2020] [Indexed: 11/29/2022]
Abstract
Tongue cancer treatment often results in impaired speech, swallowing, or mastication. Simulating the effect of treatments can help the patient and the treating physician to understand the effects and impact of the intervention. To simulate deformations of the tongue, identifying accurate mechanical properties of tissue is essential. However, not many succeeded in characterizing in-vivo tongue stiffness. Those who did, measured the tongue At Rest (AR), in which muscle tone subsides even if muscles are not willingly activated. We expected to find an absolute rest state in participants 'under General Anesthesia' (GA). We elaborated on previous work by measuring the mechanical behavior of the in-vivo tongue under aspiration using an improved volume-based method. Using this technique, 5 to 7 measurements were performed on 10 participants both AR and under GA. The obtained Pressure-Shape curves were first analyzed using the initial slope and its variations. Hereafter, an inverse Finite Element Analysis (FEA) was applied to identify the mechanical parameters using the Yeoh, Gent, and Ogden hyperelastic models. The measurements AR provided a mean Young's Modulus of 1638 Pa (min 1035 - max 2019) using the Yeoh constitutive model, which is in line with previous ex-vivo measurements. However, while hoping to find a rest state under GA, the tongue unexpectedly appeared to be approximately 2 to 2.5 times stiffer under GA than AR. Explanations for this were sought by examining drugs administered during GA, blood flow, perfusion, and upper airway reflexes, but neither of these explanations could be confirmed.
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Mukhina E, Rohan PY, Connesson N, Payan Y. Calibration of the fat and muscle hyperelastic material parameters for the assessment of the internal tissue deformation in relation to pressure ulcer prevention. Comput Methods Biomech Biomed Engin 2020. [DOI: 10.1080/10255842.2020.1813426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Briot N, Chagnon G, Masri C, Girard E, Payan Y. Ex-vivo mechanical characterisation of the breast Cooper’s ligaments. Comput Methods Biomech Biomed Engin 2020. [DOI: 10.1080/10255842.2020.1812155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Nazari MA, Perrier P, Meadows J, Christen MO, Mojallal A, Payan Y. Studying the effects of facial muscles activations to investigate the optimum positioning of subcutaneous suspension sutures. Comput Methods Biomech Biomed Engin 2020. [DOI: 10.1080/10255842.2020.1822050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Calka M, Perrier P, Ohayon J, Grivot Boichon C, Rochette M, Payan Y. Real-time simulations of human tongue movements with a reduced order model of a non-linear dynamic biomechanical model. Comput Methods Biomech Biomed Engin 2020. [DOI: 10.1080/10255842.2020.1812158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Elyasi E, Perrier A, Payan Y. The effect of rectus femoris muscle modelling technique on knee joint kinematics: a preliminary study. Comput Methods Biomech Biomed Engin 2019. [DOI: 10.1080/10255842.2020.1714236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Perrier A, Gatin L, Bucki M, Geffrier A, Denormandie P, Payan Y. Biomechanical modeling of the diabetic foot ulcer risk to guide surgery. Comput Methods Biomech Biomed Engin 2019. [DOI: 10.1080/10255842.2020.1714256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Moreau-Gaudry A, Chenu O, Dang MV, Bosson JL, Hommel M, Demongeot J, Cannard F, Diot B, Prince A, Hughes C, Vuillerme N, Payan Y. Reduction of Prolonged Excessive Pressure in Seated Persons With Paraplegia Using Wireless Lingual Tactile Feedback: A Randomized Controlled Trial. IEEE JOURNAL OF TRANSLATIONAL ENGINEERING IN HEALTH AND MEDICINE-JTEHM 2018; 6:2100611. [PMID: 29984117 PMCID: PMC6033051 DOI: 10.1109/jtehm.2018.2842746] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 04/26/2018] [Accepted: 05/25/2018] [Indexed: 11/10/2022]
Abstract
Pressure ulcers (PU) are known to be a high-cost disease with a risk of severe morbidity. This paper evaluates a new clinical strategy based on an innovative medical device [Tongue Display Unit (TDU)] that implements perceptive supplementation in order to reduce prolonged excessive pressure, recognized as one of the main causes of PU. A randomized, controlled, and parallel-group trial was carried out with 12 subjects with spinal cord injuries (SCI). Subjects were assigned to the control (without TDU, [Formula: see text]) or intervention (with TDU, [Formula: see text]) group. Each subject took part in two sessions, during which the subject, seated on a pressure map sensor, watched a movie for one hour. The TDU was activated during the second session of the intervention group. Intention-to-treat analysis showed that the improvement in adequate weight shifting between the two sessions was higher in the intervention group (0.84 [0.24; 0.89]) than in the control group (0.01 [-0.01; 0.09]; [Formula: see text]) and that the ratio of prolonged excessive pressure between the two sessions was lower in the intervention group (0.74 [0.37; 1.92]) than in the control group (1.72 [1.32; 2.56]; [Formula: see text]). The pressure map sensor was evaluated as being convenient for use in daily life; however, this was not the case for the TDU. This paper shows that persons with SCI could benefit from a system based on perceptive supplementation that alerts and guides the user on how to adapt their posture in order to reduce prolonged excessive pressure, one of the main causes of PU.
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Morin F, Courtecuisse H, Chabanas M, Payan Y. Rest shape computation for highly deformable model of brain. Comput Methods Biomech Biomed Engin 2015; 18 Suppl 1:2006-7. [DOI: 10.1080/10255842.2015.1070591] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Perrier A, Bucki M, Luboz V, Vuillerme N, Payan Y. 3D musculoskeletal finite element analysis of the foot kinematics under muscle activation with and without ankle arthrodesis. Comput Methods Biomech Biomed Engin 2015; 18:2022-2023. [PMID: 26273957 DOI: 10.1080/10255842.2015.1069605] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Perrier A, Luboz V, Bucki M, Vuillerme N, Payan Y. Conception and evaluation of a 3D musculoskeletal finite element foot model. Comput Methods Biomech Biomed Engin 2015; 18 Suppl 1:2024-5. [DOI: 10.1080/10255842.2015.1069606] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Antherieu G, Connesson N, Payan Y, Favier D, Mozer P. NiTi based stent for the treatment of acute urinary retention due to benign prostatic hyperplasia: a preliminary study on NiTi wires and tubes under pure bending. Comput Methods Biomech Biomed Engin 2015; 17 Suppl 1:190-1. [PMID: 25580555 DOI: 10.1080/10255842.2014.931679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Luboz V, Promayon E, Payan Y. Linear elastic properties of the facial soft tissues using an aspiration device: towards patient specific characterization. Ann Biomed Eng 2014; 42:2369-78. [PMID: 25186433 DOI: 10.1007/s10439-014-1098-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 08/19/2014] [Indexed: 11/25/2022]
Abstract
Biomechanical modeling of the facial soft tissue behavior is needed in aesthetic or maxillo-facial surgeries where the simulation of the bone displacements cannot accurately predict the visible outcome on the patient's face. Because these tissues have different nature and elastic properties across the face, depending on their thickness, and their content in fat or muscle, individualizing their mechanical parameters could increase the simulation accuracy. Using a specifically designed aspiration device, the facial soft tissues deformation is measured at four different locations (cheek, cheekbone, forehead, and lower lip) on 16 young subjects. The stiffness is estimated from the deformations generated by a set of negative pressures using an inverse analysis based on a Neo Hookean model. The initial Young's modulus of the cheek, cheekbone, forehead, and lower lip are respectively estimated to be 31.0 kPa±4.6, 34.9 kPa±6.6, 17.3 kPa±4.1, and 33.7 kPa±7.3. Significant intra-subject differences in tissue stiffness are highlighted by these estimations. They also show important inter-subject variability for some locations even when mean stiffness values show no statistical difference. This study stresses the importance of using a measurement device capable of evaluating the patient specific tissue stiffness during an intervention.
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Rohan PY, Lobos C, Nazari MA, Perrier P, Payan Y. Finite element modelling of nearly incompressible materials and volumetric locking: a case study. Comput Methods Biomech Biomed Engin 2014; 17 Suppl 1:192-3. [DOI: 10.1080/10255842.2014.931682] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Chekhchoukh A, Goumidi M, Vuillerme N, Payan Y, Glade N. Electrotactile vision substitution for 3D trajectory following. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2013; 2013:6413-6. [PMID: 24111209 DOI: 10.1109/embc.2013.6611022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Navigation for blind persons represents a challenge for researchers in vision substitution. In this field, one of the used techniques to navigate is guidance. In this study, we develop a new approach for 3D trajectory following in which the requested task is to track a light path using computer input devices (keyboard and mouse) or a rigid body handled in front of a stereoscopic camera. The light path is visualized either on direct vision or by way of a electro-stimulation device, the Tongue Display Unit, a 12 × 12 matrix of electrodes. We improve our method by a series of experiments in which the effect of the modality of perception and that of the input device. Preliminary results indicated a close correlation between the stimulated and recorded trajectories.
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Luboz V, Perrier A, Stavness I, Lloyd J, Bucki M, Cannard F, Diot B, Vuillerme N, Payan Y. Foot ulcer prevention using biomechanical modelling. COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING-IMAGING AND VISUALIZATION 2013. [DOI: 10.1080/21681163.2013.837410] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Luboz V, Perrier A, Bucki M, Cannard F, Diot B, Vuillerme N, Payan Y. Dynamic biomechanical modelling for foot ulcer prevention. Comput Methods Biomech Biomed Engin 2013; 16 Suppl 1:149-51. [DOI: 10.1080/10255842.2013.815863] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Bucki M, Payan Y, Cannard F, Diot B, Vuillerme N. Multi-modal framework for subject-specific finite element model generation aimed at pressure ulcer prevention. Comput Methods Biomech Biomed Engin 2013; 16 Suppl 1:147-8. [DOI: 10.1080/10255842.2013.815861] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Vallier S, Troccaz J, Gabelle-Flandin I, Payan Y. Biomechanical breast modelling to improve patient positioning during breast cancer radiotherapy. Comput Methods Biomech Biomed Engin 2013; 16 Suppl 1:278-9. [DOI: 10.1080/10255842.2013.815862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Chekhchoukh A, Vuillerme N, Payan Y, Glade N. Effect of saccades in tongue electrotactile stimulation for vision substitution applications. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2013; 2013:3543-3546. [PMID: 24110494 DOI: 10.1109/embc.2013.6610307] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The visual substitution paradigm aims to facilitate the life of blind people. Generally one uses electro-stimulating devices where electrodes are arranged into arrays to stimulate the skin or the tongue mucosa to send signals of visual type to the subjects. When an electro-stimulation signal is applied continuously (e.g. when static visual scenes are displayed for a long period of time), the receptors of the affected region can get saturated and the patient may lose the displayed information. We propose here some mechanisms that ameliorate the quality of perception of the electro-stimulation information. The electrical signal is encoded as 2D scenes projected onto the tongue via a Tongue Display Unit, i.e. an electro-tactile stimulator formed by a 12×12 matrix of electrodes. We propose to apply stochastic saccades on this signal. Our assumption is that this eye-inspired mechanism should make the visual substitution more efficient (by improving the perception) because of the reduction of the tactile receptors saturation. The influence of saccades was evaluated by a series of experiments. Results revealed a benefit on the persistence of perception due to saccades. This work helps to prevent the saturation of receptors on the tongue. Therefore increasing the quality of vision by the way of the electro-stimulation. It allows new enhancement features to retinal prosthesis devices which suffer from the same phenomenon.
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Luboz V, Perrier A, Vuillerme N, Bucki M, Cannard F, Payan Y. Modélisation biomécanique du pied pour étudier l’influence des orthèses. Ann Phys Rehabil Med 2012. [DOI: 10.1016/j.rehab.2012.07.275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Barth I, Bensmail D, Hlavackova P, Payan Y, Vuillerme N. Représentations de l’incidence de l’escarre d’origine neurologique sur les pratiques soignantes : premiers résultats d’une enquête exploratoire menée au sein d’un service de MPR. Ann Phys Rehabil Med 2012. [DOI: 10.1016/j.rehab.2012.07.363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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