Direct Model-Based Inversion for Improved Freehand Optical Ultrasound Imaging
Direct Model-Based Inversion for Improved Freehand Optical Ultrasound Imaging
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DOI：
10.1109/ius52206.2021.9593785
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发表时间：
2021-09
期刊：
影响因子：
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通讯作者：
E. Alles;Eleanor C. Mackle;S. Noimark;Adrien E Desiardins
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文献类型：
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作者：
E. Alles;Eleanor C. Mackle;S. Noimark;Adrien E Desiardins
光学超声成像使用光来生成和检测脉冲回波超声。最近，我们提出了一种光纤光学超声成像探头，包括64个源和一个单一的接收器，允许视频速率，徒手成像。然而，它的低数量的源限制了图像对比度时，使用延迟和求和重建。在这里，我们提出了一种基于基于模型的反演的光学超声的替代图像形成范例，其中低数量的源允许直接（即，非迭代）反演。该模型准确地结合了孔径的几何形状，频率相关的源的方向性，并在整个孔径的性能变化，从而减少与这些属性相关的图像伪影。该方法实现了15 dB的增益，在图像对比度相比，延迟和求和，在类似的图像形成时间。
Optical ultrasound imaging uses light to both generate and detect pulse-echo ultrasound. Recently, we presented a fibre-optic optical ultrasound imaging probe comprising 64 sources and a single receiver that allowed for video-rate, freehand imaging. However, its low number of sources limited the image contrast when using Delay-and-Sum reconstruction. Here, we present an alternative image formation paradigm for optical ultrasound based on model-based inversion, where the low number of sources allows for direct (i.e., non-iterative) inversion under modest hardware requirements. The model accurately incorporates the aperture geometry, frequency-dependent source directivity, and performance variation across the aperture, thereby reducing image artefacts associated with these properties. The method achieves a 15 dB gain in image contrast compared to Delay-and-Sum, at a similar image formation time.