Luis Elvira
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View article: Plane Wave Imaging with Large-Scale 2D Sparse Arrays: A Method for Near-Field Enhancement via Aperture Diversity
Plane Wave Imaging with Large-Scale 2D Sparse Arrays: A Method for Near-Field Enhancement via Aperture Diversity Open
In the context of a medical imaging application for preclinical research, specifically cerebrovascular imaging in small animals, this work addresses the challenges associated with using a large-scale 2D ultrasonic array comprising 32×32 el…
View article: Characteristics and possible function of wingbeat acoustic emissions of tortricid moths
Characteristics and possible function of wingbeat acoustic emissions of tortricid moths Open
Most moths are nocturnal flying insects and some species have evolved ears to detect bats, or produce ultrasounds to dissuade or confuse them. Normally moths emit anti-bat ultrasounds when they hear bat echolocation calls, but recently it …
View article: Tissue Characterization by Ultrasound: Linking Envelope Statistics with Spectral Analysis for Simultaneous Attenuation Coefficient and Scatterer Clustering Quantification
Tissue Characterization by Ultrasound: Linking Envelope Statistics with Spectral Analysis for Simultaneous Attenuation Coefficient and Scatterer Clustering Quantification Open
This paper proposes the use of quantitative methods for the characterization of tissues by linking, into a single approach, ideas coming from the spectral analysis methods commonly used to determine the attenuation coefficient with the env…
View article: Plane Wave Imaging with Large-Scale 2D Sparse Arrays: A Method for Near-Field Enhancement via Aperture Diversity
Plane Wave Imaging with Large-Scale 2D Sparse Arrays: A Method for Near-Field Enhancement via Aperture Diversity Open
In the context of a medical imaging application for preclinical research, specifically, erebrovascular imaging in small animals, this work examines the challenges of using a Large-Scale 2D ultrasonic array with 32×32 elements (96×96 wavele…
View article: Non-invasive meningitis screening in neonates and infants: multicentre international study
Non-invasive meningitis screening in neonates and infants: multicentre international study Open
Background and objectives: Meningitis diagnosis requires a lumbar puncture (LP) to obtain cerebrospinal fluid (CSF) for a laboratory-based analysis. In high-income settings, LPs are part of the systematic approach to screen for meningitis,…
View article: Dual photoacoustic/ultrasound technologies for preclinical research: current status and future trends
Dual photoacoustic/ultrasound technologies for preclinical research: current status and future trends Open
Photoacoustic (PA) imaging, by integrating optical and ultrasound (US) modalities, combines high spatial resolution with deep tissue penetration, making it a transformative tool in biomedical research. This review presents a comprehensive …
View article: Meningitis Screening in Young Infants Based on a Novel, Non- Invasive, Transfontanellar Ultrasound Device: a Proof-of- Concept Study
Meningitis Screening in Young Infants Based on a Novel, Non- Invasive, Transfontanellar Ultrasound Device: a Proof-of- Concept Study Open
Background Meningitis is a potentially life-threatening disease if not promptly diagnosed and treated. Clinical presentation is often unspecific, especially among young infants and newborns, justifying the need to perform lumbar punctures …
View article: Evaluation of the Cell Concentration in Suspensions of Human Leukocytes by Ultrasound Imaging: The Influence of Size Dispersion and Cell Type
Evaluation of the Cell Concentration in Suspensions of Human Leukocytes by Ultrasound Imaging: The Influence of Size Dispersion and Cell Type Open
This work focuses on the use of ultrasound imaging to evaluate the cell concentration of dilute leukocyte suspensions in the range of 10–3000 cells/µL. First, numerical simulations were used to study the influence of the size dispersion an…
View article: Determination of Phase Jumps in the Measurement of Phase Velocity of Samples Obeying a Frequency Power-Law Attenuation Coefficient Using Kramers–Kronig Relations
Determination of Phase Jumps in the Measurement of Phase Velocity of Samples Obeying a Frequency Power-Law Attenuation Coefficient Using Kramers–Kronig Relations Open
Ultrasonic phase velocity spectroscopy is a very sensitive technique used in the measurement of material properties. In a phase velocity calculation, ambiguities can arise in the spectral phases, in the form of integer multiples of 2π rad,…
View article: Evaluation of cell concentration from ultrasound backscattering signals using envelope statistics analysis
Evaluation of cell concentration from ultrasound backscattering signals using envelope statistics analysis Open
Anomalies in the cell concentration of biological tissues or fluids can be related to diseases such as bacterial meningitis. As a result of meningitis, certain amount of leukocytes reaches the cerebrospinal fluid which is otherwise essenti…
View article: Versatile Ultrasonic Spectrometer for Liquids With Practical Sample Handling by Using Standard Cuvettes
Versatile Ultrasonic Spectrometer for Liquids With Practical Sample Handling by Using Standard Cuvettes Open
This work describes the development and tests of a new ultrasonic spectrometer for liquids based on the use of commercial cuvettes for sample handling. The spectrometer operates in the frequency range from 20 to 80 MHz and gathers some imp…
View article: Study of the Relation between the Resonance Behavior of Thickness Shear Mode (TSM) Sensors and the Mechanical Characteristics of Biofilms
Study of the Relation between the Resonance Behavior of Thickness Shear Mode (TSM) Sensors and the Mechanical Characteristics of Biofilms Open
This work analyzes some key aspects of the behavior of sensors based on piezoelectric Thickness Shear Mode (TSM) resonators to study and monitor microbial biofilms. The operation of these sensors is based on the analysis of their resonance…