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Angiogenesis imaging by spatiotemporal analysis of ultrasound contrast agent dispersion kinetics

机译:时空分析超声造影剂弥散动力学的血管生成成像

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The key role of angiogenesis in cancer growth has motivated extensive research with the goal of noninvasive cancer detection by blood perfusion imaging. However, the results are still limited and the diagnosis of major forms of cancer, such as prostate cancer, are currently based on systematic biopsies. The difficulty in the detection of angiogenesis partly resides in a complex relationship between angiogenesis and perfusion. This may be overcome by analysis of the dispersion kinetics of ultrasound contrast agents. Determined by multipath trajectories through the microvasculature, dispersion permits a better characterization of the microvascular architecture and, therefore, more accurate detection of angiogenesis. In this paper, a novel dispersion analysis method is proposed for prostate cancer localization. An ultrasound contrast agent bolus is injected intravenously. Spatiotemporal analysis of the concentration evolution measured at different pixels in the prostate is used to assess the local dispersion kinetics of the injected agent. In particular, based on simulations of the convective diffusion equation, the similarity between the concentration evolutions at neighbor pixels is the adopted dispersion measure. Six measurements in patients, compared with the histology, provided a receiver operating characteristic curve integral equal to 0.87. This result was superior to that obtained by the previous approaches reported in the literature.
机译:血管生成在癌症生长中的关键作用激发了广泛的研究,其目标是通过血液灌注成像检测无创癌症。但是,结果仍然有限,目前主要基于系统活检来诊断主要形式的癌症,例如前列腺癌。检测血管生成的困难部分在于血管生成和灌注之间的复杂关系。这可以通过分析超声造影剂的分散动力学来克服。由通过微血管的多径轨迹确定,分散可以更好地表征微血管结构,因此可以更精确地检测血管生成。本文提出了一种用于前列腺癌定位的新的弥散分析方法。超声造影剂推注静脉内注射。在前列腺中不同像素处测量的浓度变化的时空分析用于评估注射剂的局部分散动力学。特别地,基于对流扩散方程的模拟,在相邻像素处的浓度演变之间的相似性是所采用的色散度量。与组织学相比,对患者进行的六次测量提供的接收器工作特征曲线积分等于0.87。该结果优于文献中报道的先前方法获得的结果。

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