Biomimetic phantom with anatomical accuracy for evaluating brain volumetric measurements with magnetic resonance imaging.

Brain image volumetric measurements (BVM) methods have been used to quantify brain tissue volumes using magnetic resonance imaging (MRI) when investigating abnormalities. Although BVM methods are widely used, they need to be evaluated to quantify their reliability. Currently, the gold-standard reference to evaluate a BVM is usually manual labeling measurement.

vibro-acoustography characterization of osteoporosis in an experimental mice model.

Background: Osteoporosis is a highly prevalent multifactorial osteometabolic disease, classically diagnosed, , by dual energy X-ray absorptiometry (DXA). This study evaluated osteoporosis, , using vibro-acoustography (VA), an elastographic technique based on ultrasound radiation force.

Methods: Three groups of mice femurs were used: (I) control group (CG), (II) osteoporosis group (OG) and (III) treated osteoporosis group (TOG), in which the animals received pamidronate, an antiresorptive drug.

Nondestructive inspection of metal specimen using tone-burst vibro-acoustography.

Even though the pulse-echo ultrasonic technique is commonly used for the assessment of metal structures, it has some inherent limitations. Vibro-acoustography (VA) is a relatively new ultrasonic technique which has demonstrated a great potential in revealing defects in objects, however it is traditionally used to analyze the integrity of specimens made of low-stiffness materials. This work presents the evaluation of the performance of VA technique for the inspection of a steel structure, which was manufactured with defects of known geometry on its inner surface.

Preliminary results of vibro-acoustography evaluation of bone surface and bone fracture.

Background: Vibro-acoustography (VA) uses two co-focused ultrasound beams with slightly different frequencies. The beams interact and generate a low-frequency focus to excite an object.

Methods: A two-element confocal ultrasound transducer with central frequency at 3.

Reproducibility of abdominal fat assessment by ultrasound and computed tomography.

Objective: To test the accuracy and reproducibility of ultrasound and computed tomography (CT) for the quantification of abdominal fat in correlation with the anthropometric, clinical, and biochemical assessments.

Materials And Methods: Using ultrasound and CT, we determined the thickness of subcutaneous and intra-abdominal fat in 101 subjects-of whom 39 (38.6%) were men and 62 (61.

Evaluation of postural balance in mild cognitive impairment through a three-dimensional electromagnetic system.

Introduction: Elderly people with cognitive impairment are at greater risk for falls; thus, an understanding of the earliest stages of cognitive decline is necessary.

Objective: To compare postural balance between elderly people with and without mild cognitive impairment using a three-dimensional system.

Methods: Thirty elderly people with mild cognitive impairment and thirty healthy elderly subjects were selected.

A hybrid transducer to magnetically and ultrasonically evaluate magnetic fluids.

Ultrasound, magnetic fields, and optical techniques have been explored for clinical diagnosis and therapy. However, these techniques have limitations. In this study, we constructed and characterized a transducer to magnetically and ultrasonically investigate samples labeled with magnetic particles.

A pilot study on the evaluation of postural strategies in young and elderly subjects using a tridimensional electromagnetic system.

Unlabelled: One resorts to various postural strategies while attempting to maintain balance.

Objective: To assess the postural strategies adopted by young and elderly subjects in varying sensory conditions by using a system of tridimensional electromagnetic sensors positioned on the projection of the first thoracic vertebra and on the sacral region. Postural oscillation values for young and elderly subjects were also reported.

A new method to analyze the subjective visual vertical in patients with bilateral vestibular dysfunction.

Objective: The aim of this study was to assess the subjective visual vertical in patients with bilateral vestibular dysfunction and to propose a new method to analyze subjective visual vertical data in these patients.

Methods: Static subjective visual vertical tests were performed in 40 subjects split into two groups. Group A consisted of 20 healthy volunteers, and Group B consisted of 20 patients with bilateral vestibular dysfunction.

Analysis of static postural balance using a 3d electromagnetic system.

Unlabelled: Early detection of postural disorders is essential for timely interventions in patients with imbalance.

Aim: A pilot study describing a new tool for evaluating static postural balance.

Study Design: A cross-sectional study of a contemporary series.

Acoustic elastography under dynamic compression using one-dimensional track motion.

This work provides an detailed analysis of a method for ultrasound-based elasticity image formation using dynamic compression technique. Radiofrequency (RF) data acquired from a homogenous phantom, where both mechanical and acoustic proprieties were set equivalent to biologic tissues, were used to validate our results. Local strains were obtained by speckle tracking of the acoustic scatterers motion between a pair of RF echo fields acquired when the phantom was dynamically deformed at low frequency (approximately 1 Hz).