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Published July 21, 2008 | Published
Journal Article Open

High-numerical-aperture-based virtual point detectors for photoacoustic tomography


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.

Additional Information

© 2008 American Institute of Physics. Received 21 April 2008; Accepted 02 July 2008; Published online 22 July 2008. We thank Dr. Xinmai Yang for helping us manufacture the detector. This project was sponsored in part by National Institutes of Health Grant Nos. R01 NS46214 and R01 EB000712.

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