The effect of dynamic focusing of the beam on the acoustic field distribution inside the ultrasonic ring array

This paper presents the analysis of readings acquired from the ultrasonic ring array used in tomography for the diagnosis of female breast tissue. In addition, this paper also presents the results for the acoustic field distribution simulation, acquired through a method of summing up all acoustic fields generated by each of the elementary transducers of the ring array. The change in acoustic field pressure level when changing activation frequency (2 MHz, 3MHz, 4MHz) of the elementary ultrasonic transducers for the sector consisting of 32 and 64 ultrasonic transducers was studied. By changing the time of activation of individual transducers, a change in the natural position of the focus inside the ultrasonic ring array was observed. For the sector consisting of 32 ultrasonic transducers the relation between the echo coming from the wires of the wire pattern and the level of noise and distortion on the ultrasonographic image for different locations of the focus of the central transducers was studied. The results were compared with the simulations of the acoustic field, which were conducted using MATLAB software. This research is the continuation of studies [13, 14] aimed at choosing the optimal focus and number of transducers in ultrasonic ring array with the goal of receiving the best possible quality of images of cross-sections of the female breast

The Effect of Dynamic Beam Deflection and Focus Shift on the Acoustic Field Distribution Inside the Ultrasonic Ring Array

This paper presents the results of acoustic field distribution simulations for the 1024-element ultrasonic ring array intended for the diagnosis of female breast tissue with the use of ultrasound tomography. For the purpose of analysing data, all acoustic fields created by each elementary transducer were combined. The natural position of the focus inside the ultrasonic ring array was changed by altering activation time of individual transducers in sectors consisting of 32, 64, and 128 ultrasonic transducers. Manipulating the position of the focus inside the array will allow to concentrate the ultrasonic beam in a chosen location in the interior space of the ring array. The goal of this research is to receive the best possible quality of images of cross-sections of the female breast. The study also analysed the influence of the acoustic field distribution on the inclination of the beam. The results will enable to choose an optimal focus and an optimal number of activated transducers

Application of the Ultrasonic Ring Array Used in UTT for the Reflection Method Examinations of Structures

The ultrasonic ring array, designed for examining the female breast with the use of ultrasonic transmission tomography (UTT), has been adapted for reflection method trials. By altering the activation time of ultrasonic elementary transducers, the parameters of the focus were changed with the aim at improving the quality of the obtained ultrasound image. For this purpose, a phantom consisting of rods having varying thicknesses was analyzed when moving the position of the focus with the use of dynamic focusing along the symmetry axis of the ring array ranging from 30 to 130 mm from central transducers. In previous trials, which applied an algorithm using the sum of all the acoustic fields, a series of simulations was performed in conditions identical to the phantom trial. This paper documents attempts at improving the parameters of the acoustic field distribution during unconventional focusing. The research here presented is a continuation of examinations focusing on the acoustic field distribution inside the ultrasonic ring array with the aim at finding the best possible cross-section of the female breast using the reflection method