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Interpretation and applicability of empirical tissue enhancement metrics in dynamic contrast-enhanced MRI based on a multiple pathway model

机译:基于多路径模型的动态对比增强MRI中经验性组织增强指标的解释和适用性

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摘要

Computer simulations based on a physiologically realistic tracer kinetic model with multiple pathways was used to provide insights on the applicability and interpretation of tissue enhancement metrics such as the maximum slope, peak enhancement and area under curve, commonly used in dynamic contrast-enhanced (DCE) MRI. Results show that physiological conditions of the tissue that could affect the accuracy of the maximal slope method include a high blood flow, increased variability of flow within the vasculature or a low vascular volume. Interestingly, changes in permeability and interstitial volume might not affect the accuracy of the maximal slope method. Time-to-peak and peak value of the tissue enhancement curve are not strictly properties of the tissue alone, and they cannot be linearly related to intrinsic tissue parameters such as blood flow, blood volume, capillary permeability, interstitial volume and mean transit time. Similar to the normalized initial area under tissue concentration curve, an alternative estimate of the total tracer distribution volume can be simply given by the ratio of tracer concentration in the tissue and artery sampled at the final DCE scan.
机译:基于具有多种途径的生理逼真的示踪剂动力学模型的计算机模拟用于提供对组织增强指标(例如最大斜率,峰增强和曲线下面积)的适用性和解释的见解,这些指标通常用于动态对比增强(DCE)中核磁共振结果表明,可能影响最大斜率方法准确性的组织生理状况包括高血流量,脉管系统内血流变异性增加或低血管体积。有趣的是,渗透率和间隙体积的变化可能不会影响最大斜率方法的准确性。组织增强曲线的峰峰值和峰值并不是严格意义上的组织性质,它们与内在组织参数(如血流量,血容量,毛细血管通透性,间质容积和平均通过时间)不是线性相关的。类似于组织浓度曲线下的标准化初始面积,可以通过在最终DCE扫描中采样的组织和动脉中的示踪剂浓度之比,简单地给出总示踪剂分布体积的替代估计。

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