28 February 2008 Improving the image quality of photoacoustic tomography (PAT) by using a negative acoustic lens
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Abstract
Although a small point ultrasound transducer has a wide acceptance angle, its signal-to-noise (SNR) is low due to the high thermal-noise-induced electric voltages in the transducer, which is a result of its small active area. By contrast, a finite size flat transducer has high sensitivity (good SNR), but the acceptance angle is generally small, which limits its application in reconstruction-based photoacoustic tomography (PAT). In this paper, we report a negative lens concept to increase the acceptance angle for a flat transducer. We also provide phantom experiments that demonstrate this concept can greatly increase the detection region for PAT and without losing sensitivity.
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Changhui Li, Geng Ku, Lihong V. Wang, "Improving the image quality of photoacoustic tomography (PAT) by using a negative acoustic lens", Proc. SPIE 6856, Photons Plus Ultrasound: Imaging and Sensing 2008: The Ninth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, 685623 (28 February 2008); doi: 10.1117/12.763533; https://doi.org/10.1117/12.763533
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