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24 February 2009 High-NA-based virtual point detectors for photoacoustic imaging
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We demonstrated 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. Phantom experiments are provided to demonstrate the applications of high-NA-based virtual point detectors in photoacoustic tomography and thermoacoustic tomography. The virtual point detector is also used to image the cerebral cortex of mice.
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Changhui Li and Lihong V. Wang "High-NA-based virtual point detectors for photoacoustic imaging", Proc. SPIE 7177, Photons Plus Ultrasound: Imaging and Sensing 2009, 71770R (24 February 2009);

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