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. Author manuscript; available in PMC: 2022 Aug 1.
Published in final edited form as: Ultrasound Med Biol. 2021 May 11;47(8):2296–2309. doi: 10.1016/j.ultrasmedbio.2021.03.035

Figure 4:

Figure 4:

Verification of the focal spot of the HIFU transducer. (a) Beam pattern taken at the focus of the transducer. The beam width (defined by the −6 dB points) at the focus is 2.5 mm. (b) Axial pressure field of the transducer. The axial beam width is 15.4 mm.