ДВУМЕРНЫЕ ФАЗИРОВАННЫЕ РЕШЕТКИ ДЛЯ ПРИМЕНЕНИЯ В ХИРУРГИИ: МНОГОФОКУСНАЯ ГЕНЕРАЦИЯ И СКАНИРОВАНИЕстатья
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Дата последнего поиска статьи во внешних источниках: 24 января 2020 г.
Аннотация:Abstract
—A numerical simulation and a comparative analysis of the acoustic fields produced by two-dimensional
phased arrays intended for ultrasonic surgery are performed for the case of a multiple focus (in particular,
25 foci) generation. The calculations were conducted for arrays (with an operating frequency of 1.5 MHz) consisting
of 256 elements 5 mm in diameter, which were positioned on the array surface both regularly and randomly.
The array foci can be formed simultaneously, but, in this case, the intensity levels of the secondary peaks
in the ultrasonic field can exceed the values that guarantee the safe application of this method in surgery.
A much safer way is to synthesize many foci with the use of several configurations, each of which contains a
smaller number of foci. The number of foci in individual configurations must be approximately the same. It is
demonstrated that randomization of the element distribution over the array surface provides an opportunity
to improve the array performance, to reduce the intensity levels of secondary peaks in the acoustic field, and
to increase the array capability for multiple focus scanning off the array axis.