TWO-DIMENSIONAL PHASED ARRAYS FOR SURGERY: MOVEMENT OF A SINGLE FOCUS

Gavrilov, L.R.; Hand, J.W.

Авторы: Gavrilov L.R., Hand J.W.
Журнал: Acoustical Physics
Том: 46
Год издания: 2000
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 390
Последняя страница: 399
Аннотация: Abstract-Numerical simulation and comparative analysis of acoustic fields generated by two-dimensional phased arrays designed for ultrasonic surgery is conducted. The case of movement of a single focus by an array with the surface shaped as a part of a spherical shell with the curvature radius 120 mm is considered. The influence of the number of elernsnts (,varying from 61 to 1024). their diameter (from 2.5 to 10 mm), frequency (from 1 to 2 MHz), and the degree of sparseness of the elements at the array surface on the field characteristics is studied. The ca1cula:ions are performed for arrays ~vithe lements positicned at the surface both regularly (in square. annular, or hexagonal pattens) and randomly. Criteria for the evaluation of the "quality" of intensity disuibutions in the field generated by an array in the case of movement of a single focus are suggested. Of ai: arrays studied, the best quality of distributions is obtained for an array containing 256 elements of diameter 5 mm randomly positioned at the array surface. The quality of the intensity distributions for arrays consisting of 255.256. and 1024 elements positioned regularly (in square. annular, and hexagonal patterns) is inferior to the corresponding quality for arrays with randomly positioned elements. The irregularity in elements' positioning considerably improves the dismbution quality by suppressing the secondary intensity peaks in the field generated by the array; or, alternatively. it provides an opportunity to obtain the same distribution quality with a fraction of the number of elements in :he array. The effects of thc number and shape of elements, errors in. phase setting. frequency modulation of signals. and non-uniform distribution of amplitudes over the array surface on the distribution quality are analyzed.
Добавил в систему: Гаврилов Леонид Рафаилович

	ИСТИНА	Войти в систему Регистрация
	Интеллектуальная Система Тематического Исследования НАукометрических данных
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

Интеллектуальная Система Тематического Исследования НАукометрических данных

TWO-DIMENSIONAL PHASED ARRAYS FOR SURGERY: MOVEMENT OF A SINGLE FOCUSстатья

Прикрепленные файлы