Development of the local magnification method for quantitative evaluation of endoscope geometric distortion
Development of the local magnification method for quantitative evaluation of endoscope geometric distortion
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DOI：
10.1117/1.jbo.21.5.056003
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发表时间：
2016-05
影响因子：
3.5
通讯作者：
Quanzeng Wang;W. Cheng;N. Suresh;H. Hua
中科院分区：
文献类型：
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作者：
Quanzeng Wang;W. Cheng;N. Suresh;H. Hua
抽象的。随着诊断能力的提高和复杂的光学设计，内窥镜技术正在进步。几何失真作为几种重要的光学性能特征之一，会对尺寸估计和特征识别相关诊断产生负面影响。因此，对于内窥镜行业和医疗器械监管机构来说，一种定量和简单的失真评估方法势在必行。然而，目前还没有这样的方法可用。虽然图像校正技术已经相当成熟，但它们对基于复杂数学模型的多维图像数据的处理严重依赖于计算能力，即难以理解。一些常用的失真评估方法，如图像高度失真(DPH)或径向失真(DRAD)，要么过于简单，无法准确描述失真，要么容易产生参考图像的误差。我们开发了评估内窥镜失真的基本局部放大率(ML)方法。在此基础上，我们还提出了DPH和DRAD的计算方法。该方法克服了上述局限性，在整个视野内具有清晰的物理意义，有助于诊断时对病变大小的估计。最重要的是，该方法可以促进内窥镜技术推向市场，并有可能在国际内窥镜标准中采用。
Abstract. With improved diagnostic capabilities and complex optical designs, endoscopic technologies are advancing. As one of the several important optical performance characteristics, geometric distortion can negatively affect size estimation and feature identification related diagnosis. Therefore, a quantitative and simple distortion evaluation method is imperative for both the endoscopic industry and the medical device regulatory agent. However, no such method is available yet. While the image correction techniques are rather mature, they heavily depend on computational power to process multidimensional image data based on complex mathematical model, i.e., difficult to understand. Some commonly used distortion evaluation methods, such as the picture height distortion (DPH) or radial distortion (DRAD), are either too simple to accurately describe the distortion or subject to the error of deriving a reference image. We developed the basic local magnification (ML) method to evaluate endoscope distortion. Based on the method, we also developed ways to calculate DPH and DRAD. The method overcomes the aforementioned limitations, has clear physical meaning in the whole field of view, and can facilitate lesion size estimation during diagnosis. Most importantly, the method can facilitate endoscopic technology to market and potentially be adopted in an international endoscope standard.