Jean-Gabriel Minonzio

Jean-Gabriel Minonzio
Universidad de Valparaíso (Chile) | CINV · School of Informatics Civil Engineering

PhD

About

124
Publications
15,419
Reads
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1,376
Citations
Citations since 2016
42 Research Items
927 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Introduction
Position : full profesor at Universidad de Valparaiso detached from CNRS - Researcher (Chargé de Recherche, section 28, Laboratoire Imagerie Biomédicale ) - Research topics : signal and image processing, ultrasonic cortical bone characterization, guided waves, DORT method, ultrasound scattering and propagation, signal and image processing, machine learning, clinical measurements
Additional affiliations
July 2018 - present
Universidad de Valparaíso (Chile)
Position
  • Professor
Description
  • détachement CNRS
October 2009 - present
French National Centre for Scientific Research
Position
  • Researcher
September 2009 - present
Sorbonne Université
Position
  • CNRS - Researcher (Chargé de Recherche)
Education
September 2003 - December 2006
Paris Diderot University
Field of study
  • PhD in Physical Acoustics
September 2002 - February 2003
Paris Diderot University
Field of study
  • Physical acoustics
September 1999 - September 2003
École Supérieure de Physique et de Chimie Industrielles
Field of study
  • Engineering in Physics and Research

Publications

Publications (124)
Article
The bone quality of patients undergoing hip replacement surgery is poorly predicted by radiographs alone. With better bone quality information available to a surgeon, the operation can be performed more safely. The aim of this study was to investigate whether ultrasound signals of cortical bone at peripheral sites such as the tibia and radius can b...
Article
No PDF available ABSTRACT Multimodal ultrasonic guided waves with rich dispersion information have been widely applied for waveguide evaluation. However, there are still some challenges to extract multimode dispersion curves using the traditional pitch-catch method, including lack of spatial information and poor signal-to-noise ratio. Phase array h...
Article
Osteoporosis is still a worldwide problem, particularly due to associated fragility fractures. Patients at risk of fracture are currently detected using the X-Ray gold standard dual-energy X-ray absorptiometry (DXA), based on a calibrated 2-D image. Different alternatives, such as 3-D X-rays, magnetic resonance imaging (MRI) or ultrasound, have bee...
Article
Full-text available
The population is aging worldwide, creating new challenges to the quality of life of older adults and their families. Falls are an increasing but not inevitable threat to older adults. Information technologies provide several solutions to address falls, but smart homes and the most available solutions require expensive and invasive infrastructures...
Article
Cortical bone is a complex multiscale medium and its study is of importance for clinical fracture prevention. In particular, cortical attenuation is known to be linked with shock energy absorption and ability to resist fracture. However, the links between cortical bone absorption and its multiscale structure are still not well understood. This work...
Article
Full-text available
Quantitative UltraSound (QUS) methods have been introduced to assess cortical bone health at the radius and tibia through the assessment of Cortical Thickness (Ct.Th), Cortical Porosity (Ct.Po) and bulk wave velocities. Ultrasonic attenuation is another QUS parameter which is not currently used. We assess the feasibility of in vivo measurement of u...
Article
Full-text available
Bone fractures are caused by diseases or accidents and are a widespread problem throughout the globe. Worldwide, 1.6 millions of hip fractures occur every year and are expected to rise to 6.3 millions in 2050. The current gold standard to assess fracture risk is the Dual-energy X-ray Absorptiometry (DXA), which provides a projected image of the bon...
Article
Full-text available
Osteoporosis is a skeletal disease leading to bone fragility and increasing the risk of fractures. Current clinical gold standard, Dual-energy X-ray Absorptiometry, is limited by its projection technique and poor spatial resolution. High Resolution-peripheral Quantitative Computed Tomography (HRpQCT) is able to provide estimates of cortical thickne...
Article
Full-text available
Automatic fall detection is a very active research area, which has grown explosively since the 2010s, especially focused on elderly care. Rapid detection of falls favors early awareness from the injured person, reducing a series of negative consequences in the health of the elderly. Currently, there are several fall detection systems (FDSs), mostly...
Article
Full-text available
Recent ultrasound axial transmission techniques exploit the multimode waveguide response of long bones to yield estimates of cortical bone structure characteristics. This pilot cross‐sectional study aimed to evaluate the performance at the one‐third distal radius of a bidirectional axial transmission (BDAT) device to discriminate between fractured...
Article
Full-text available
Summary The estimation of cortical thickness (Ct.Th) and porosity (Ct.Po) at the tibia using axial transmission ultrasound was successfully validated ex vivo against site-matched micro-computed tomography. The assessment of cortical parameters based on full-spectrum guided-wave analysis might improve the prediction of bone fractures in a cost-effec...
Article
Full-text available
The aim of this study was to estimate cortical porosity (Ct.Po) and cortical thickness (Ct.Th) using 500-kHz bi-directional axial transmission (AT). Ct.ThAT and Ct.PoAT were obtained at the tibia in 15 patients from a 2-D transverse isotropic free plate model fitted to measured guided wave dispersion curves. The velocities of the first arriving sig...
Conference Paper
Background, Motivation, and Objective: Estimation of key factors of fracture risk, such as cortical bone thickness and porosity, can be obtained using high resolution-peripheral quantitative computed tomography (HR-pQCT) [K. K. Nishiyama et al J Bone Miner Res 25:882–90, 2010]. The feasibility of in vivo cortical thickness estimation by analyzing t...
Article
Full-text available
Several studies showed the ability of the cortex of long bones such as the radius and tibia to guide mechanical waves. Such experimental evidence has given rise to the emergence of a category of quantitative ultrasound techniques, referred to as the axial transmission, specifically developed to measure the propagation of ultrasound guided waves in...
Conference Paper
Full-text available
Mode conversion theory seems to be promising for interpretation of the guided mode propagation in the fractured and healing long bone. In the study, long cortical bone was modelled as a tubular structure and the transmission characteristics of two fundamental longitudinal modes L(0,1) and L(0,2) were investigated by axial transmission method. Acryl...
Article
Full-text available
Dew harvesting can be a supplementary source of freshwater in semiarid and arid areas. Several experiments on small-scale dew condensers (usually of 1 m²) have been carried out in many places in the world; however, few experiments have been conducted on large-scale collectors integrated into buildings. This work aims to assess one year of dew water...
Article
Dispersion results in the spreading and overlapping of the wave-packets, which often limits the capability of signal interpretation; on the other hand, such a phenomenon can also be used for structure or media evaluation. In this study, the authors propose an original dispersive Radon transform (DRT), which is formulated as integration transform al...
Preprint
Full-text available
Dispersion results in the spreading and overlapping of the wave-packets, which often limits the capability of signal interpretation; on the other hand such a phenomenon can also be used for structure or media evaluation. In this study, we propose an original dispersive Radon transform (DRT), which is formulated as an integration transform along a s...
Article
Guided waves-based techniques are currently under development for quantitative cortical bone assessment. However, the signal interpretation is challenging due to multiple mode overlapping. To overcome this limitation, dry point-contact transducers have been used at low frequencies for a selective excitation of the zeroth order anti-symmetric Lamb A...
Article
Full-text available
Recent bone quantitative ultrasound approaches exploit the multimode waveguide response of long bones for assessing properties such as cortical thickness and stiffness. Clinical applications remain, however, challenging, as the impact of soft tissue on guided waves characteristics is not fully understood yet. In particular, it must be clarified whe...
Conference Paper
Ultrasonic guided waves have been proposed as a promising means to evaluate the long cortical bone. However, the complete extraction of all dispersion curves is still challenging. Aiming to enhance the signal-to-noise-ratio (SNR) and improving the ambiguity of mode identification, we propose a multichannel wideband mode selective excitation method....
Conference Paper
Guided wave propagation is at the heart of the axial transmission techniques designed to assess bone health status. The method involves matching observed and predicted dispersion characteristics of guided waves. The strength of the technique is that it can infer more than one bone property from the measured ultrasonic data, such as cortical thickne...
Article
Recent progress in quantitative ultrasound exploit the multimode waveguide response of long bones. Measurements of the guided modes, along with suitable waveguide modeling, have the potential for inferring strength-related factors such as stiffness (mainly determined by cortical porosity) and cortical thickness. However, the development of such mod...
Article
Some pioneering studies have shown the clinical feasibility of long bones evaluation using ultrasonic guided waves. Such a strategy is typically designed to determine the dispersion information of the guided modes to infer the elastic and structural characteristics of cortical bone. However, there are still some challenges to extract multimode disp...
Article
Full-text available
The two-dimensional Fourier transform (2D-FT) analysis of multichannel signals is a straightforward method to extract the dispersion curves of guided modes. Basically, the time signals recorded at several positions along the waveguide are converted to the wavenumber-frequency space, so that the dispersion curves (i.e., the frequency-dependent waven...
Article
Our long-term goal is to develop an ultrasonic method to characterize the thickness, stiffness and porosity of the cortical shell of the femoral neck, which could enhance hip fracture risk prediction. To this purpose, we proposed to adapt a technique based on the measurement of guided waves. We previously evidenced the feasibility of measuring circ...
Article
Cortical bone loss is not fully assessed by current Xray methods, and there is an unmet need in identifying women at risk of osteoporotic fracture who should receive a treatment. The last decade has seen the emergence of ultrasound axial transmission techniques to assess cortical bone. Recent axial transmission techniques exploit the multimode wave...
Article
A method is proposed to evaluate in a non-contact way the phase velocity dispersion curves of circumferential waves around a shell of arbitrary shape immersed in a fluid. No assumptions are made about the thickness or the material of the shell. A geometrical model is derived to describe the shape of the radiated wavefronts in the surrounding fluid,...
Article
Osteoporosis is a frequent bone disease that mainly affects women after menopause. It is characterized by a decrease in bone mass and a deterioration of the micro-architecture, which can lead to an increased risk of fracture. Ultrasound technologies provide an affordable mean to implement non invasive solutions to diagnostically assess the characte...
Conference Paper
A step forward towards ultrasonic characterization of cortical bone has been recently reached by showing that cortical bone behaves as a waveguide for ultrasound. Measurements of the guided modes dispersion relations, along with appropriate waveguide modeling, have the potential for inferring strength-related factors such as stiffness (determined b...
Conference Paper
Full-text available
The influence of soft-tissue on guided wave measurements for the assessment of cortical bone properties is not fully understood yet. To improve our understanding of the soft-tissue influence on the guided modes propagation characteristics, a series of assemblies of soft tissue- and bone-mimicking phantoms were ultrasonically investigated using the...
Conference Paper
Structural decay of bone is not fully assessed by current X-ray methods, and there is an unmet need in identifying women at risk of fracture who should receive a treatment. The last decade has seen the emergence of ultrasound (US) axial transmission (AT) techniques to assess cortical bone. Recent AT techniques exploit the multimode waveguide respon...
Conference Paper
Full-text available
In the study, we propose a sparse inverse singular value decomposition (SI-SVD) technique, which combines SVD and a least-squares sparse inversion method to improve the resolution of the ultrasonic (US) guided waves (GW) spectrum of long cortical bones. The method was assessed using synthetic data and experimental signals recorded on a 4-mm thick b...
Conference Paper
The objective of this study is to assess the clinical performance of a novel ultrasound bidirectional axial transmission (BDAT) prototype. The speed of sound of the first arriving signal (V FAS ) was measured in the radius and tibia of 58 postmenopausal females. An optimized V FAS measurement protocol was introduced in order to reduce the clinical...
Article
The use of quantitative ultrasound (QUS) for bone has increased sharply over the last two decades. QUS offers potential benefits over other diagnostic modalities which include (1) ex vivo non-destructive testing, (2) in vivo non-ionizing testing, and (3) the ability to assess important cortical bone quality factors which cannot easily be captured w...
Article
Full-text available
Clinical bone quality assessment still relies strongly on bone mineral density (BMD). It is now well accepted that BMD predicts only around 60% of the individual fracture risk because it depends on geometrical dimensions of the bone and mechanical properties of its cortical shell. The tibia mid-shaft is a clinically relevant site for ultrasound axi...
Article
Full-text available
The goal of this work was to show that a non-absorbing free plate model can predict with a reasonable accuracy guided modes measured in bone-mimicking phantoms that have circular cross-section. Experiments were carried out on uncoated and coated phantoms using a clinical axial transmission setup. Adjustment of the plate model to the experimental da...
Article
Because of the recognized importance of cortical bone in osteoporotic fracture risk, efforts have been made to improve its measurement. A step forward towards the ultrasonic characterization of cortical bone has been made recently with reports showing that cortical bone behaves as a waveguide (WG) for ultrasound. Measurements of the guided modes di...
Conference Paper
Full-text available
Following recent advances in medical ultrasound imaging modalities, almost all human tissues can currently be examined. However, there is one exception: the human skeleton. Recent results have shown that cortical bone behaves like an elastic waveguide [1] for this organ supporting the propagation of several guided modes, depending on the cortical w...
Article
Full-text available
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Conference Paper
Mode conversion theory seems to be promising for interpretation of the guided mode propagation in the fractured and healing long bone. In the study, long cortical bone was modelled as a tubular structure and the transmission characteristics of two fundamental longitudinal modes L(0,1) and L(0,2) were investigated by axial transmission method. Acryl...
Article
Full-text available
Measuring guided waves in cortical bone arouses a growing interest to assess skeletal status. In most studies, a model of waveguide is proposed to assist in the interpretation of the dispersion curves. In all the reported investigations, the bone is mimicked as a waveguide with a constant thickness, which only approximates the irregular geometry of...
Article
Advanced finite element models of the thorax have been developed to study, for example, the effects of car crashes. While there is a need for material properties to parameterize such models, specific properties are largely missing. Non-destructive techniques applicable in vivo would, therefore, be of interest to support further development of thora...
Article
Full-text available
A wide range of ultrasound methods has been proposed to assess the mechanical strength of bone. The axial transmission technique, which consists of measuring guided elastic modes through the cortical shell of long bones such as the radius or tibia, has recently emerged as one of the most promising approaches of all bone exploration methods. Determi...
Article
Full-text available
In the context of hip fracture risk prediction, measurement of guided waves could improve the assessment of cortical femoral neck properties. The decomposition of the time reversal operator (DORT) method was previously shown to be efficient to measure circumferential guided modes in an empty cortical bone-mimicking tube of circular cross section. I...
Article
Full-text available
Measuring guided wave propagation in long bones is of interest to the medical community. When an inclination exists between the probe and the tested specimen surface, a bias is introduced on the guided mode wavenumbers. The aim of this study was to generalize the bidirectional axial transmission technique initially developed for the first arriving...
Article
Full-text available
Ultrasonic exploration of the femoral neck is of wide interest as it can provide some information about a potential fracture risk, particularly for osteoporosic patients. In vivo, the ultrasonic wave first propagates through soft tissues that can be idealized as a homogeneous fluid. Then, the ultrasonic wave interacts with the bone structure. Trans...
Article
Full-text available
Cortical bone porosity has been evidenced as being a major if not the major "footprint" of bone loss and fragility. Several studies report that cortical bone behaves like a waveguide. Measurements of guided mode wavenumbers together with appropriate waveguide modeling have therefore the potential for providing estimations of effective stiffness coe...
Article
Full-text available
Our domain of interest is cortical bone characterization, i.e., determination of structural and material properties by means of ultrasound waves. The frequency spectrum of Lamb type of waves are the input data of the method of parameters identification, based on a least mean square algorithm. Specificities of clinical measurements of long bones req...
Article
Following recent advances in medical ultrasound imaging methods almost all human tissues can currently be examined. There are, however, two exceptions: the human skeleton and the brain, because bone tissue is a strongly attenuating and defocusing medium, rendering classical pulse-echo imaging methods inappropriate. Specific imaging approaches withi...