1. Delay-multiply-and-sum-based synthetic aperture focusing in photoacoustic microscopy.
- Author
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Jongin Park, Seungwan Jeon, Jing Meng, Liang Song, Lee, Jin S., and Chulhong Kim
- Subjects
ACOUSTIC imaging ,SYNTHETIC apertures ,MICROSCOPY ,IN vivo studies ,SIGNAL-to-noise ratio - Abstract
We propose an improved version of a synthetic aperture focusing technique (SAFT) based on a delaymultiply- and-sum algorithm for acoustic-resolution photoacoustic microscopy (AR-PAM). In this method, the photoacoustic (PA) signals from multiple scan-lines are combinatorially coupled, multiplied, and then summed. This process can be considered a correlation operation of the PA signals in each scan-line, so the spatial coherent information between the PA signals can be efficiently extracted. By applying this method in conventional ARPAM, lateral resolution and signal-to-noise ratio in out-of-focus regions are much improved compared with those estimated from the previously developed SAFT, respectively, thereby achieving the extension of the imaging focal region. Our phantom and in vivo imaging experiments prove the validity of our proposed method. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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