Abstract
In breast ultrasound CT imaging, the ultrasound signals received by high-density CMUT cylindrical array have problems of low transmission efficiency, susceptibility to interference from other signals, and an inability to achieve efficient acquisition. Therefore, to overcome these problems, based on acoustic metamaterials and graphene structure, an efficient transmission model of the multi-channel breast ultrasonic signals was designed, and a finite element simulation experiment was conducted. Research showed that the separation of ultrasonic signals could be achieved by the model designed in this article. The anti-interference ability in the ultrasonic signal acquisition process was effectively improved by the good multi-channel directional transmission and the sound wave local enhancement effect, which improved the sound wave transmission efficiency. In addition, the acoustic signals could be effectively transmitted from 80 kHz to 4000 kHz, realizing broadband transmission. Based on the flexibility of the design of the phononic crystal structure, phase adjustment could be achieved in a wide frequency range by changing the parameters of the primary cell structure. This enabled the CMUT cylindrical array to obtain better directivity characteristics, laying the foundation for high-quality breast ultrasound imaging.
Highlights
In recent years, breast cancer has ranked first in the incidence of female tumors worldwide, and has become a major public health problem in contemporary society [1].the early and accurate diagnosis and timely treatment of breast cancer are important
The specific manifestations are as follows [10,11,12,13,14]: (1) the ultrasound signal intensity of minimal breast lesions is weak, and the acquisition is difficult; (2) the ultrasound signal transmission process is interfered with by the surrounding environment, and the transmission efficiency is low; (3) the limited bandwidth of the capacitive micromachined ultrasound transducer (CMUT) will lead to the sound waves of different frequency components to be lost during the transmission process, causing signal integrity problems; (4) the phase modulation function is not provided by the transmission of traditional acoustic signals
At the same seen from thediseased waveform that the which frequency is 80 the sound wave signal has a time, the breast ultrasound signal is transmitted directionally along the acoustic channel and transmission effect in the whole process, and the sound pressure value is stable at 1.5 Pa, reaches the receiving end of the CMUT transducer without spreading to the surroundings
Summary
Breast cancer has ranked first in the incidence of female tumors worldwide, and has become a major public health problem in contemporary society [1]. The research of ultrasound CT imaging technology is of great significance for the early detection and long-term diagnosis and treatment of breast cancer [4,5,6]. (2) the ultrasound signal transmission process is interfered with by the surrounding environment, and the transmission efficiency is low; (3) the limited bandwidth of the CMUT will lead to the sound waves of different frequency components to be lost during the transmission process, causing signal integrity problems; (4) the phase modulation function is not provided by the transmission of traditional acoustic signals. Based on acoustic metamaterials, the design of a multi-channel structure suitable for the efficient transmission of breast ultrasound signals has become a new CMUT efficient acquisition solution. The phase of the ultrasound signals is controlled, and the collection efficiency of CMUT is improved, which provides a data source for ultrasound tomography, and promotes research in the early screening of breast cancer
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