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Numerical simulations of partial elements excitation for hemispherical high-intensity focused ultrasound phased transducer |
| Yanqiu Zhang(张艳秋)1, Hao Zhang(张浩)2, Tianyu Sun(孙天宇)1, Ting Pan(潘婷)1, Peiguo Wang(王佩国)3, and Xiqi Jian(菅喜岐)1,† |
1 School of Biomedical Engineering & Technology, Tianjin Medical University, Tianjin 300070, China;
2 College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China;
3 Department of Radiotherapy, Cancer Institute and Hospital of Tianjin Medical University, Tianjin 300070, China |
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Abstract The hemispherical phased transducer maximizes the coverage of the skull and the ultrasonic energy per unit area of the skull is minimized, thereby reducing the risk of skull burns, but the transducer has a small focal area adjustment range, increasing the focal length of treatment is an urgent question for this type of transducer. In this paper, a three-dimensional high-intensity focused ultrasound (HIFU) transcranial propagation model is established based on the human head structure. The finite difference time domain (FDTD) is combined with the Westervelt acoustic wave nonlinear propagation equation and Penne's biological heat conduction equation for numerical simulation of the sound pressure field and temperature field. Forming a treatable focal area in a small-opening hemispherical transducer with a small amount of numerical simulation calculation focusing at a set position to determine the minimum partial excitation area ratio of focusing. And then, applying these preliminary results to a large-opening diameter hemispherical transducer and the temperature field formed by it or full excitation is studied. The results show that the focus area with the excitation area ratio of less than 22% moves forward to the transducer side when the excitation sound is formed. When the excitation area ratio is greater than or equal to 23%, it focuses at the set position. In the case of partial incentives, using 23% of the partial array, the adjustable range of the treatable focal area formed in the three-dimensional space is larger than that of the full excitation.
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Received: 07 April 2021
Revised: 06 May 2021
Accepted manuscript online: 27 May 2021
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PACS:
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87.50.Y-
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(Biological effects of acoustic and ultrasonic energy)
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87.55.Gh
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(Simulation)
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87.55.dh
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(Tissue response)
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87.55.de
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(Optimization)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 81272495) and the Natural Science Foundation of Tianjin (Grant No. 16JC2DJC32200). |
Corresponding Authors:
Xiqi Jian
E-mail: jianxiqi@tmu.edu.cn
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Cite this article:
Yanqiu Zhang(张艳秋), Hao Zhang(张浩), Tianyu Sun(孙天宇), Ting Pan(潘婷), Peiguo Wang(王佩国), and Xiqi Jian(菅喜岐) Numerical simulations of partial elements excitation for hemispherical high-intensity focused ultrasound phased transducer 2021 Chin. Phys. B 30 078704
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