Improved contrast in laser-diode-based photoacoustic images with short-lag spatial coherence beamforming

被引：27

作者：

Bell, Muyinatu A. Lediju ^{[1
]}

Guo, Xiaoyu ^{[2
]}

Kang, Hyun Jae ^{[3
]}

Boctor, Emad ^{[3
,4
]}

机构：

[1] Johns Hopkins Univ, CISST, Engn Res Ctr, Baltimore, MD 21205 USA

[2] Johns Hopkins Univ, Dept Elect Engn, Baltimore, MD USA

[3] Johns Hopkins Univ, Dept Comp Sci, Baltimore, MD 21218 USA

[4] Johns Hopkins Univ, Dept Radiol, Baltimore, MD 21218 USA

来源：

2014 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS) | 2014年

关键词：

ULTRASOUND;

D O I：

10.1109/ULTSYM.2014.0010

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

Pulsed laser diodes (PLDs) enable photoacoustic imaging with lower cost, increased portability, and higher frame rates compared to conventional Q-switched Nd:YAG lasers. However, the main disadvantage of the PLD is its low peak power, which necessitates averaging thousands of photoacoustic signals to achieve signal-to-noise ratios that are comparable to those produced by an Nd: YAG laser. The averaging process degrades temporal resolution with minimal improvements to image contrast. This work is the first to investigate the use of a PLD and short-lag spatial coherence (SLSC) beamforming to display high-contrast photoacoustic images with minimal to no signal averaging required. The mean contrast in single photoacoustic images of targets as deep as 5-15 mm from the surface was improved by 11-17 dB with SLSC beamforming when compared to conventional delay-and-sum (DAS) beamforming of the same data. The SLSC correlation kernel was adjusted based on laser pulse lengths to demonstrate applicability to coded excitation. Results suggest that coherence-based beamforming can overcome current limitations with real-time PLD-based photoacoustic imaging.

引用

页码：37 / 40

页数：4

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