Aberration Correction Using Ray Approximation with Account for Refraction in Transcranial HIFU Applications

Авторы: Rosnitskiy P.B., Gavrilov L.R., Sapozhnikov O.A., Mershina E.A., Khokhlova V.А.
Сборник: Abstract book of the 20th Annual International Symposium for Therapeutic Ultrasound (ISTU 2021)
Серия: Non-thermal FUS
Тезисы
Год издания: 2021
Место издания: HICO, Gyeongju, South Korea
Первая страница: 18
Последняя страница: 18
Номер статьи: SS1-09
Аннотация: Transcranial clinical HIFU-systems successfully combine the use of multi-element arrays with ray approach for compensating aberrations caused by variable thickness of the skull. Diffraction-based algorithms have been proposed but not yet employed in clinics. The aim of the study was to evaluate the enhancement of the ray-based correction by accounting for refraction at the skull in comparison with the non-refractive ray approach and full-wave diffraction model. It was shown that all methods provided tight focusing; focal intensity was the highest when full diffraction correction was applied, ray correction with and without refraction yielded 62% and 56% of intensity, correspondingly, compared to this maximum value. The account for refraction within the ray approximation improves the field quality when focusing through the skull. However, the full diffraction method showed significantly higher focal gain and thus is beneficial for clinical use.
Добавил в систему: Гаврилов Леонид Рафаилович

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