ArticleSensors (Basel, Switzerland)2016
Design and Fabrication of Double-Focused Ultrasound Transducers to Achieve Tight Focusing.
Article in Sensors (Basel, Switzerland), 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed.
- High-frequency (> 65 MHz) broadband transparent transducer with ultrathin gold electrode for dual-mode photoacoustic and laser-induced ultrasound microscopy.Photoacoustics · 2025Article
- Spherical lesion formation in HIFU using robotic assistance for controlled focal point manipulation.Scientific reports · 2025Article
- Ultrasound-Mediated Ocular Drug Delivery: From Physics and Instrumentation to Future Directions.Micromachines · 2023Review
- A Transparent Ultrasound Array for Real-Time Optical, Ultrasound, and Photoacoustic Imaging.BME frontiers · 2022Article
- Spatial localization of mechanical excitation affects spatial resolution, contrast, and contrast-to-noise ratio in acoustic radiation force optical coherence elastography.Biomedical optics express · 2019Article
- Design, Fabrication, and Evaluation of Multifocal Point Transducer for High-Frequency Ultrasound Applications.Sensors (Basel, Switzerland) · 2019Article
- Design of Acoustical Bessel-Like Beam Formation by a Pupil Masked Soret Zone Plate Lens.Sensors (Basel, Switzerland) · 2019Article
- A 40-MHz Ultrasound Transducer with an Angled Aperture for Guiding Percutaneous Revascularization of Chronic Total Occlusion: A Feasibility Study.Sensors (Basel, Switzerland) · 2018Article
- Ultrasound-assisted photothermal therapy and real-time treatment monitoring.Biomedical optics express · 2018Article
- A 35 MHz/105 MHz Dual-Element Focused Transducer for Intravascular Ultrasound Tissue Imaging Using the Third Harmonic.Sensors (Basel, Switzerland) · 2018Article
- Increased light penetration due to ultrasound-induced air bubbles in optical scattering media.Scientific reports · 2017Article
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Authors and funding
2 authors.
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Abstract
Beauty treatment for skin requires a high-intensity focused ultrasound (HIFU) transducer to generate coagulative necrosis in a small focal volume (e.g., 1 mm³) placed at a shallow depth (3-4.5 mm from the skin surface). For this, it is desirable to make the F-number as small as possible under the largest possible aperture in order to generate ultrasound energy high enough to induce tissue coagulation in such a small focal volume. However, satisfying both conditions at the same time is demanding. To meet the requirements, this paper, therefore, proposes a double-focusing technique, in which the aperture of an ultrasound transducer is spherically shaped for initial focusing and an acoustic lens is used to finally focus ultrasound on a target depth of treatment; it is possible to achieve the F-number of unity or less while keeping the aperture of a transducer as large as possible. In accordance with the proposed method, we designed and fabricated a 7-MHz double-focused ultrasound transducer. The experimental results demonstrated that the fabricated double-focused transducer had a focal length of 10.2 mm reduced from an initial focal length of 15.2 mm and, thus, the F-number changed from 1.52 to 1.02. Based on the results, we concluded that the proposed double-focusing method is suitable to decrease F-number while maintaining a large aperture size.
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