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首页> 外文期刊>Journal of Biophotonics >Non-local means improves total-variation constrained photoacoustic image reconstruction
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Non-local means improves total-variation constrained photoacoustic image reconstruction

机译：非本地手段可提高全文变化约束的光声图像重建

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摘要

Photoacoustic/Optoacoustic tomography aims to reconstruct maps of the initial pressure rise induced by the absorption of light pulses in tissue. This reconstruction is an ill-conditioned and under-determined problem, when the data acquisition protocol involves limited detection positions. The aim of the work is to develop an inversion method which integrates denoising procedure within the iterative model-based reconstruction to improve quantitative performance of optoacoustic imaging. Among the model-based schemes, total-variation (TV) constrained reconstruction scheme is a popular approach. In this work, a two-step approach was proposed for improving the TV constrained optoacoustic inversion by adding a non-local means based filtering step within each TV iteration. Compared to TV-based reconstruction, inclusion of this non-local means step resulted in signal-to-noise ratio improvement of 2.5 dB in the reconstructed optoacoustic images.
机译：光声/光声层析成像旨在重建组织中光脉冲吸收引起的初始压力升高的图谱。当数据采集协议涉及有限的检测位置时，这种重建是一个病态和欠确定的问题。这项工作的目的是开发一种反演方法，将去噪过程与基于模型的迭代重建相结合，以提高光声成像的定量性能。在基于模型的重建方案中，全变分（TV）约束重建方案是一种流行的方法。在这项工作中，通过在每个TV迭代中添加一个基于非局部均值的滤波步骤，提出了一种改进TV约束光声反演的两步方法。与基于电视的重建相比，包含此非局部均值步骤可使重建光声图像的信噪比提高2.5 dB。

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