3D cone-beam breast ultrasonic tomography imaging for capacitive micromachined ultrasonic transducer cylindrical array

Abstract

In this paper, a 3D cone-beam ultrasonic transmission tomography method for capacitive micromachined ultrasonic transducer (CMUT) cylindrical phased array was proposed. The performance of the proposed method was evaluated by numerical simulation experiments. After beam focusing of the transmitting array, the deviation of reconstructed sound attenuation distribution and sound speed distribution were respectively reduced by at least 71.4% and 46.4%. The research results in this paper will provide a good theoretical and practical foundation for the realization of ultrasonic imaging based on CMUT cylindrical array in the future.

FEM-based analysis on sensing out-of-plane displacements of low-order Lamb wave modes by CMUTs

“…w ¼ pA 1 cos(pz) À ikB 2 cos(qz) (6) for asymmetric modes, where A 1 , A 2 , B 1 , and B 2 can be determined by the traction-free boundary condition. 27 For instance, the wave structures of Lamb waves in a traction-free aluminum plate with For the A0 lamb waves, the wave structure across the thickness of the plate is anti-symmetric for the in-plane displacement and symmetric for the out-of-plane displacement (the out-of-plane displacement is dominated at low frequencies).…”

“…In the past two decades, capacitive micro-machined ultrasonic transducers (CMUTs), which are considered as the most promising alternatives to traditional piezoelectric transducers, 1,2 have been greatly developed in the medical field for applications such as medical ultrasound imaging, [3][4][5][6] high-intensity focused ultrasound (HIFU) for tumor treatment, 7,8 and intravascular ultrasound. 9 In view of the successful cases of CMUTs in medical applications, many scholars started to seek applications of CMUTs in the field of structural health monitoring (SHM).…”