Plane wave and synthetic transmit aperture echography using laser-induced ultrasound (Conference Presentation)

D. Thompson, L. Demi, E. Kruit, D. Gasteau, Marieke Olsman, S. Manohar
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Abstract

We present laser-induced ultrasound (LIUS) imaging, using a conventional linear ultrasound probe as a receiver. The LIUS source consists of a 40 μm thick film of Carbon Black-doped PDMS. Illumination of this LIUS transmitter with a 10 ns pulsed Nd:YAG laser with a 10 Hz repetition rate leads to the generation of a short, unipolar ultrasound pulse as a consequence of the photoacoustic effect. Two synthetically focused imaging techniques will be presented: coherently compounded multi-angled plane wave imaging (PWI) and synthetic transmit aperture imaging (SAI) . In the PWI case a planar LIUS transmitter, matched in size to the conventional probe aperture, is used. In the SAI case, the same film is illuminated sequentially at different locations along the aperture by an array of multimode optical fibres. For both PWI and SAI a comparison between conventionally acquired and LIUS images is made, as well as a cross-comparison between PWI and SAI. Images of wire phantoms, speckle analysis and finally images of tissue-mimicking phantoms demonstrate the image quality and advantages offered by LIUS sources. Aside from generating shorter pulses for enhanced resolution, the continuous nature of the absorber and the illumination spot provides a cleaner, more homogeneous plane wave field. The outlook for these unconventional US sources and their relative advantages and disadvantages are discussed.
激光诱导超声的平面波和合成透射孔径超声(会议报告)
我们提出激光诱导超声(LIUS)成像,使用传统的线性超声探头作为接收器。LIUS光源由40 μm厚的炭黑掺杂PDMS薄膜组成。用10ns脉冲Nd:YAG激光器以10hz的重复频率照射LIUS发射机,由于光声效应,可以产生短的单极超声脉冲。介绍了两种综合聚焦成像技术:相干复合多角度平面波成像(PWI)和合成透射孔径成像(SAI)。在PWI的情况下,一个平面LIUS发射机,在尺寸上匹配传统的探头孔径,被使用。在SAI的情况下,同一层薄膜被多模光纤阵列沿着孔径的不同位置依次照射。对于PWI和SAI,将常规获取的图像与LIUS图像进行比较,并在PWI和SAI之间进行交叉比较。线影图像、斑点分析和最后的仿组织影图像展示了LIUS源提供的图像质量和优势。除了产生更短的脉冲以提高分辨率外,吸收剂和照明光斑的连续特性提供了更干净,更均匀的平面波场。讨论了美国这些非常规能源的前景及其相对优势和劣势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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