Abstract
Ultrasound computed tomography (USCT) systems based on capacitive micromachined ultrasonic transducer (CMUT) arrays have a wide range of application prospects. For this paper, a high-precision image reconstruction method based on the propagation path of ultrasound in breast tissue are designed for the CMUT ring array; that is, time-reversal algorithms and FBP algorithms are respectively used to reconstruct sound speed distribution and acoustic attenuation distribution. The feasibility of this reconstruction method is verified by numerical simulation and breast model experiments. According to reconstruction results, sound speed distribution reconstruction deviation can be reduced by 53.15% through a time-reversal algorithm based on wave propagation theory. The attenuation coefficient distribution reconstruction deviation can be reduced by 61.53% through FBP based on ray propagation theory. The research results in this paper will provide key technological support for a new generation of ultrasound computed tomography systems.
Highlights
Ultrasonic Transducer Array.High-sensitivity transducer arrays and high-precision acoustic parameter reconstruction methods are the key factors of high-performance Ultrasound computed tomography (USCT) systems
In view of the above problems in the reconstruction of breast tissue acoustic parameters, this paper proposes a reconstruction method based on ultrasound propagation characteristics in breast tissue oriented to the capacitive micromachined ultrasonic transducer (CMUT) ring array
In order to verify the effectiveness of the reconstruction method proposed in this paper, projection data of ultrasound tomography imaging using the CMUT ring array are simulated by using the finite element simulation method
Summary
The aforementioned reasons lead to the low resolution of reconstructed sound speed image based on ray theory, and it is not possible to accurately reconstruct the a tiny lesion’s tissue for which the size is smaller than the ultrasound wavelength. To this point, ultrasound tomography based on the exact solution to the wave equation is the most accurate reconstruction method of sound speed image and has been studied by different authors. The research results in this paper lay a good theoretical and practical foundation for the new generation of USCT systems
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