BACKGROUND The development of any disturbance in the Circle of Willis (COW) can change the hemodynamics of blood flow and result in damage to the vascular system. Clinical methods such as TCD for diagnosing an aneurysm or growth factors and rupture can measure blood velocity. Several factors influence the accuracy of TCD that can lead to wrong evaluations and affect the treatment planning. OBJECTIVE In this study, the conformity between CFD and TCD was accomplished for investigating the accuracy of the clinical method (TCD) in different vessels of the Circle of Willis. METHODS The realistic three-dimensional models have been produced from angiography images. Considering fluid-structure interaction, a domain of the blood flow and vessel wall has been simulated by the ANSYS.CFX software. The velocity in the cerebral arteries has been calculated and compared with the velocity acquired from TCD. RESULTS According to the findings, there were significant differences between the results obtained from computational fluid dynamics and Doppler test in different vessels of the Circle of Willis. In some areas, differences close to 80 cm/s were also reported. CONCLUSION According to the results, there are possibilities of errors in carrying out a Doppler test in some arteries and can lead to wrong estimates and ultimately incorrect decisions.

中文翻译：

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特定患者的Willis环动脉瘤的经颅多普勒血流速度与数值方法的比较。

背景技术威利斯环（COW）的任何紊乱的发展都会改变血流的血液动力学，并导致对血管系统的损害。诸如TCD的诊断动脉瘤或生长因子以及破裂的临床方法可以测量血流速度。有几个因素影响TCD的准确性，这可能导致错误的评估并影响治疗计划。目的在这项研究中，CFD和TCD之间的一致性是为了研究Willis环不同血管中临床方法（TCD）的准确性。方法已经从血管造影图像产生了逼真的三维模型。考虑到流体-结构的相互作用，ANSYS.CFX软件已模拟了血流和血管壁的区域。已经计算出脑动脉的速度，并将其与从TCD获得的速度进行比较。结果根据发现，在威利斯环岛的不同血管中，从计算流体动力学和多普勒检验获得的结果之间存在显着差异。在某些地区，也报告了接近80 cm / s的差异。结论根据结果，在某些动脉中进行多普勒测验存在错误的可能性，并可能导致错误的估计并最终导致错误的决定。还报告了接近80 cm / s的差异。结论根据结果，在某些动脉中进行多普勒测验存在错误的可能性，并可能导致错误的估计并最终导致错误的决定。还报告了接近80 cm / s的差异。结论根据结果，在某些动脉中进行多普勒测验存在错误的可能性，并可能导致错误的估计并最终导致错误的决定。