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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Laser-Generated Leaky Acoustic Wave Imaging for Interventional Guidewire Guidance
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Laser-Generated Leaky Acoustic Wave Imaging for Interventional Guidewire Guidance

机译：激光产生的泄漏声波成像，用于介入导丝引导

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Ultrasound (US) is widely used to visualize both tissue and the positions of surgical instruments in real time during surgery. Previously we proposed a new method to exploit US imaging and laser-generated leaky acoustic waves (LAWs) for needle visualization. Although successful, that method only detects the position of a needle tip, with the location of the entire needle deduced from knowing that the needle is straight. The purpose of the current study was to develop a beamforming-based method for the direct visualization of objects. The approach can be applied to objects with arbitrary shapes, such as the guidewires that are commonly used in interventional guidance. With this method, illumination by a short laser pulse generates photoacoustic waves at the top of the guidewire that propagate down its metal surface. These waves then leak into the surrounding tissue, which can be detected by a US array transducer. The time of flight consists of two parts: 1) the propagation time of the guided waves on the guidewire and 2) the propagation time of the US that leaks into the tissue. In principle, an image of the guidewire can be formed based on array beamforming by taking the propagation time on the metal into consideration. Furthermore, we introduced directional filtering and a matched filter to compress the dispersion signal associated with long propagation times. The results showed that guidewires could be detected at depths of at least 70 mm. The maximum detectable angle was 56.3 degrees. LAW imaging with a 1268-mm-long guidewire was also demonstrated. The proposed method has considerable potential in new clinical applications.
机译：超声（美国）广泛用于在手术期间实时可视化手术器械的两种组织和位置。此前，我们提出了一种新方法，用于利用美国成像和激光产生的泄漏声波（法律）进行针眼。虽然成功，但是该方法仅检测针尖的位置，并且整个针的位置推导出针是直的。目前研究的目的是开发一种用于对象的直接可视化的基于波束形成的方法。该方法可以应用于具有任意形状的对象，例如常用于介入引导的导丝。利用这种方法，通过短的激光脉冲的照明在导丝的顶部产生光声波，其在其金属表面上传播。然后将这些波泄漏到周围组织中，这可以由美国阵列换能器检测。飞行时间由两部分组成：1）导丝上的引导波的传播时间和2）泄漏到组织中的美国传播时间。原则上，可以通过考虑到金属上的传播时间来基于阵列波束形成来形成导丝的图像。此外，我们引入了方向滤波和匹配的滤波器以压缩与长传播时间相关的色散信号。结果表明，可以在至少70mm的深度检测到导丝。最大可检测角度为56.3度。还证明了与1268毫米长的导丝的法律成像。该方法在新的临床应用中具有相当大的潜力。

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