Journal
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
Volume 68, Issue 1, Pages 116-126Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TUFFC.2020.2993810
Keywords
Acoustics; Ultrasonic imaging; Ultrasonic transducer arrays; Computational modeling; Computed tomography; Matlab; High intensity focused ultrasound (HIFU); hyperthermia and surgery; system and device design; therapeutics; wave propagation (including elastic waves)
Categories
Funding
- National Natural Science Foundation of China [81727806, 11774231]
- National Key Research and Development Program of the Ministry of Science and Technology [2017YFC0108900]
- Key Project of Shanghai Science and Technology Commission [17441906400, 18441905000]
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The study introduces a novel ultrasound transducer that can be rotated according to different skull geometries, improving treatment efficiency while minimizing the impact of shear waves on the treatment area. Computational tomography model simulations of nine skulls confirm the versatility and feasibility of the new transducer design.
Phase-controlled focused ultrasound transducers have opened up a new way to noninvasively treat brain diseases. However, due to the geometry and the heterogeneous medium of the human skull, the currently used hemispherical transducers cannot guarantee that the ultrasound emitted by the transducer penetrates the skull normally; consequently, the impact of the shear wave on the treatment area has to be considered. The usual approach is to turn off elements in the transducer with excessively large incident angles, but this approach reduces the efficiency of the transducer. This article presents the design of a novel transducer that can be rotated according to the different geometric shapes of the skull. The incident angles of the elements in the transducer are modified so that the effect of the shear wave on the treatment area can be ignored and the efficiency of the transducer is improved. The results of computed tomography (CT) model simulation of nine skulls verify the versatility and feasibility of the new transducer. We believe that this kind of rotatable transducer has clinical and engineering significance.
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