Beckmann Martin F, Schwab Hans-Martin, Schmitz Georg
Opt Express. 2015 Jan 26;23(2):1816-28. doi: 10.1364/OE.23.001816.
Multispectral photoacoustic laser diode systems have multiple wavelengths available simultaneously. In addition to multispectral imaging, this can be exploited to increase the signal to noise ratio (SNR) by combining these wavelengths to form a combined image, but at the loss of spectral information. Here, a novel signal processing concept is introduced, which optimizes the SNR in the reconstructions of single wavelength data from combined acquisitions while simultaneously permitting to obtain a higher SNR fused image from the same data. The concept is derived for an arbitrary number of wavelengths; it is also applicable at low pulse repetition frequencies. The concept is applied in an experiment using two wavelengths, verifying the theoretical results.
多光谱光声激光二极管系统可同时提供多个波长。除了多光谱成像外，通过组合这些波长以形成合成图像来提高信噪比（SNR），但会损失光谱信息。在此，引入了一种新颖的信号处理概念，该概念在从组合采集的单波长数据重建中优化SNR，同时允许从相同数据获得更高SNR的融合图像。该概念适用于任意数量的波长；它也适用于低脉冲重复频率。该概念应用于使用两个波长的实验中，验证了理论结果。
