The focal point of a high-numerical-aperture (NA) ultrasonic transducer can be used as a virtual point detector. This virtual point detector detects omnidirectionally over a wide acceptance angle. It also combines a large active transducer surface and a small effective virtual detector size. Thus the sensitivity is high compared with that of a real point detector, and the aperture effect is small compared with that of a finite size transducer. We present two kinds of high-NA-based virtual point detectors and their successful application in photoacoustic tomography. They can also be applied in other ultrasound-related fields.
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Research Article| July 22 2008
High-numerical-aperture-based virtual point detectors for photoacoustic tomography
Changhui Li, Lihong V. Wang; High-numerical-aperture-based virtual point detectors for photoacoustic tomography. Appl. Phys. Lett. 21 July 2008; 93 (3): 033902. https://doi.org/10.1063/1.2963365
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