Abstract
In recent years, considerable progress has been made in creating more realistic models of the cardiovascular system, often based on patient-specific anatomic data, whereas comparatively little progress has been made on incorporating measured physiological data. We have developed a method to systematically adjust the parameters of three-element windkessel outlet boundary conditions of three-dimensional blood flow models such that desired features of pressure and flow waveforms are achieved. This tuning method was formulated as the solution of a nonlinear system of equations and employed a quasi-Newton method that was informed by a reduced-order model. The three-dimensional hemodynamic models were solved using a stabilized finite-element method incorporating deformable vessel walls. The tuning method was applied to an idealized common carotid artery, an idealized iliac arterial bifurcation, and a patient-specific abdominal aorta. The objectives for the abdominal aortic model were values of the maximum and minimum of the pressure waveform, an indicator of the pressure waveform’s shape, and the mean, amplitude, and diastolic mean of the flow waveform for an infrarenal measurement plane. The hemodynamic models were automatically generated and tuned by custom software with minimal user input. This approach enables efficient development of cardiovascular models for applications including detailed evaluation of cardiovascular mechanics, simulation-based design of medical devices, and patient-specific treatment planning.
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Acknowledgments
The authors are grateful to Nathan M. Wilson, Irene E. Vignon-Clementel, C. Alberto Figueroa, Hyun Jin Kim, and Peter H. Feenstra for software contributions. This research was supported by the National Science Foundation under Grant No. 0205741 and the Benchmark Capital Congenital Cardiovascular Bioengineering Fellowship. The authors acknowledge computing resources provided by the National Science Foundation under Grant No. CNS-0619926.
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Associate Editor Larry V. McIntire oversaw the review of this article.
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Spilker, R.L., Taylor, C.A. Tuning Multidomain Hemodynamic Simulations to Match Physiological Measurements. Ann Biomed Eng 38, 2635–2648 (2010). https://doi.org/10.1007/s10439-010-0011-9
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DOI: https://doi.org/10.1007/s10439-010-0011-9