Simultaneous assessment of bone thickness and velocity for ultrasonic computed tomography using transmission-echo method

Abstract

International audienceThe robustness and accuracy of the transmissionecho (TE) method is investigated on simultaneous thickness and velocity estimation of double-layered thin bone samples. Twentytwo pairs of bovine cortical samples were assembled and measured by two pairs of immersion transducers with nominal frequencies of 1MHz and 2.25MHz. For each measurement, the TOF of six pulses contained by one transmission and two echo signals were detected and then used for the calculation. The mean relative errors of effective samples for 1MHz and 2.25MHz transducers are 4.87% and 7.13% on cortical thickness estimation, and 4.65% and 5.88% on velocity assessment, respectively. For both thickness and velocity measurement, the experiments in low frequency provide more accurate estimations, and the velocity measurement shows more stability. It is demonstrated that the TE method has the potential to simultaneously estimate the cortical thickness and ultrasonic wave velocity for the mimic model of long bones

Assessing Bone Quality of Spine on Children with Scoliosis Using Ultrasound Reflection FAI Method -- A Preliminary Study

“…for soft tissue at 2MHz was about 1dB/cm (Kremkau, 2002); the difference of the soft tissue thickness among subjects was usually only a few millimeters (Vermess et al, 2012;Zheng and Lasaygues, 2013), and it demonstrated that the attenuation caused by soft tissue was mostly less than 1dB for pediatrics.…”

Combining Ultrasound Pulse-Echo and Transmission Computed Tomography for Quantitative Imaging the Cortical Shell of Long-Bone Replicas

“…Measuring bone SOS and cortical shell thickness using transmitted and reflected pulses has been proposed by Zheng and Lasaygues (2013) using single-element transducers at a single angle. It is extended here using reconstructed PE-UCT and T-UCT data instead of the raw echo data.…”

Application of Infrared Images to Diagnosis and Modeling of Breast

“…(1) to merge temperature information with others [5] specially with 3D exams which represent the same patient like magnetic resonance, (2) to represent a model of the breast with a 3D mesh for surgical reconstruction after mastectomy modeling, (3) to identify points of correlation between IR exams and models of the patient body for finite elements analysis or other forms of treatment of the inverse problem (i.e., what is inside of the body that can result in a thermal distribution of skin' surface) [3,11,24] and (4) for some numerical analysis and other examinations like Electrical Impedance Tomography (EIT) [14] and 3D Ultrasound [35]. Moreover, three dimensional meshes of the real model can be used in surgeries simulations, for the personal project of prosthesis, for breast reduction, and other procedures.…”