A5021714035- Ultrasound Imaging and Elastography
- Elasticity and Material Modeling
- Ultrasonics and Acoustic Wave Propagation
- Ultrasound and Hyperthermia Applications
- Photoacoustic and Ultrasonic Imaging
- Corneal surgery and disorders
- Preterm Birth and Chorioamnionitis
- Urinary Bladder and Prostate Research
- Pregnancy-related medical research
- Bladder and Urothelial Cancer Treatments
- Viral-associated cancers and disorders
- Radiomics and Machine Learning in Medical Imaging
- Respiratory viral infections research
- Textile materials and evaluations
- Intestinal Malrotation and Obstruction Disorders
- Urinary Tract Infections Management
- Literacy and Educational Practices
- Esophageal and GI Pathology
- Tendon Structure and Treatment
- Mechanical Behavior of Composites
- Shoulder Injury and Treatment
- Fiber-reinforced polymer composites
- Pediatric Hepatobiliary Diseases and Treatments
- Shoulder and Clavicle Injuries
- Underwater Acoustics Research
Inserm
2024
Centre Léon Bérard
2024
Laboratoire des applications Thérapeutiques des Ultrasons
2024
Université Claude Bernard Lyon 1
2024
Universidad de Granada
2016-2023
Instituto de Investigación Biosanitaria de Granada
2000-2023
Université Toulouse III - Paul Sabatier
2008
Laboratoire Génie de Production
2006
Hospital Damas
1991
Abstract The objective of this study was to evaluate which hyperelastic model could best describe the non-linear mechanical behavior cornea, in order characterize capability parameters discriminate structural changes a damaged cornea. Porcine corneas were used, establishing two different groups: control (non-treated) and NaOH-treated (damaged) (n = 8). NaOH causes chemical burn corneal tissue, simulating disease associated damage stromal layer. Quasi-static uniaxial tensile tests performed...
A novel torsional wave sensor designed to characterize mechanical properties of soft tissues is presented in this work. Elastography a widely used technique since the 1990s map tissue stiffness. Moreover, quantitative elastography uses velocity shear waves achieve This exhibits significant limitations caused by difficulty separation between longitudinal and pressure applied while measuring. To overcome these drawbacks, proposed can isolate pure wave, avoiding possibility multiple...
Corneal mechanical changes are believed to occur before any visible structural alterations observed during routine clinical evaluation. This study proposed developing an elastography technique based on torsional waves (TWE) adapted the specificities of cornea. By measuring displacements in propagation plane perpendicular axis emitter, effect guided plate-like media was proven negligible. Ex vivo experiments were carried out porcine corneal samples considering a group control and one alkali...
Pregnancy involves a gradual change in tissue consistency, where, as gestational age increases drop stiffness is noticeable. The extracellular matrix (ECM) of the cervix whose behavior controlled by collagen structure reconfigured, due to hormonal and protein related factors that degraded it. There an increase cellular water content. maintains stable percentage, although synthesis‐solubility interaction causes transformation network increasing its diameter waviness, which destabilizes...
A sensor based on torsional waves is proposed, designed and validated to quantify elastic constants of soft tissue. The proposed transducer design able deploy a shear wave elastography technique that accurately quantifies the viscoelastic moduli tissue, which, as opposed compression waves, are strongly dependent stroma architecture, thus serving new biomarker.
The clinical ultrasound community demands mechanisms to obtain the viscoelastic biomarkers of soft tissue in order quantify condition and be able track its consistency. Torsional Wave Elastography (TWE) is an emerging technique proposed for interrogating mechanical constants. waves are a particular configuration shear waves, which propagate asymmetrically in-depth radially transmitted by disc received ring. This shown particularly efficient minimizing spurious p-waves components sensitive...
The propagation of shear waves in elastography at high frequency (>3 kHz) viscoelastic media has not been extensively studied due to the attenuation and technical limitations current techniques. An optical micro-elastography (OME) technique using magnetic excitation for generating tracking with enough spatial temporal resolution was proposed. Ultrasonics (above 20 were generated observed polyacrylamide samples. A cutoff frequency, from where no longer propagate, vary depending on mechanical...
In the field of acoustics, a medium has traditionally been considered liquid if shear waves cannot propagate. For more complex liquids, such as those containing polymer chains or surfactant aggregates, this definition begins to be unclear. By adopting rheological model-independent approach, work investigated by means dynamic elastography, liquid–solid phase transitions in viscoelastic media. When storage modulus G′ dominated loss G″, minimal wave attenuation frequency region was defined and...
The WHO estimates that 15 million babies yearly (1 in 10) will be born preterm. Worldwide, complications of preterm births have supplanted pneumonia as the primary cause child mortality [1]. biology cervical ripening leads to birth is poorly understood, and there no clinical tool quantitatively evaluate biomechanical state, which words Feltovich [2]“… likely contributes reason singleton spontaneous rate has not changed appreciably more than 100 years.” Towards this problem, we work on...
In this work, we present a novel preclinical device utilizing Torsional Wave Elastography (TWE). It comprises rotational actuator element and piezoceramic receiver ring circumferentially aligned. Both allow the transmission of shear waves that interact with tissue before being received. Our main objective is to demonstrate characterize reliability, robustness, accuracy for characterizing stiffness elastic materials soft tissues. Experimental tests are performed using two sets mimicking...
Magnetic resonance (MR) imaging was used to evaluate the shoulders of 10 symptomatic professional baseball players and one asymptomatic player, with surgical correlation in six cases arthrographic two cases. Seven small rotator cuff tears measuring 0.5-1 cm were identified on MR images, confirmation these findings patients only three patients. Cortical irregularity and/or subchondral cyst formation at posterior aspect greater tuberosity near insertion site infraspinatus tendon found five...
A combined approach is proposed here to characterize composite structures made of a recent semi-preg called HexFIT ® developed by Hexcel Composites for resin film infusion (RFI). Physicochemical and mechanical tests were first carried out on specimens obtained oven cured vacuum bag molding then compared with autoclave specimens. Non-destructive evaluation techniques (US, IR, RX) used sample in manufactured plates testing taking into account the effects process conditions. Multi-instrumented...
Experimental evidence on testing a non-ultrasonic-based probe for new approach in transluminal elastography was presented. The proposed modality generated shear waves by inducing oscillatory rotation the lumen wall. Detection of propagated achieved at set receivers mechanical contact with excitation element an electromagnetic rotational actuator whilst sensing comprised uniform anglewise arrangement four piezoelectric receivers. prototype tested two soft-tissue-mimicking phantoms that...
The mechanical status of the cervix is a key physiological element during pregnancy. By considering successful induction when active phase labor achieved, mapping properties could have predictive potential for management protocols. In this sense, we performed preliminary assessment diagnostic value using shear wave elastography before in 54 women, pregnancy outcome and Cesarean indications. Three anatomical regions standard methods, such as cervical length Bishop score, were compared. To...
DEL CARCINOMA VESICAL Introducción: El carcinoma de vejiga es una enfermedad importante por su morbi-mortalidad y multifactorialidad.Actualmente, entre los posibles agentes etiológicos que se han señalado, encuentra la infección el virus del papiloma humano (VPH).El objetivo estudio analizar, mediante realización un meta-análisis, relación existente cáncer vesical humano.Material métodos: Realizamos búsqueda en base datos electrónica MEDLINE artículos publicados hasta septiembre 2004...
Abstract Measuring the mechanical nonlinear properties of cornea remains challenging due to lack consensus in methodology and models that effectively predict its behaviour. This study proposed developing a procedure reconstruct fourth-order elastic based on mathematical model derived from theory Hamilton et al. using torsional wave elastography (TWE) technique. In order validate diagnostic capability simulated pathological conditions, two different groups were studied, non-treated samples...