Extraction of patient-specific boundary conditions from 4D-DSA and their influence on CFD simulations of cerebral aneurysms

Yuya Uchiyama, Soichiro Fujimura, Hiroyuki Takao, Hiroshi Ono, Keigo Katayama, Takashi Suzuki, Toshihiro Ishibashi, Katharina Otani, Kostadin Karagiozov, Koji Fukudome, Yuichi Murayama and Makoto Yamamoto

Computer Methods in Biomechanics and Biomedical Engineering, 2022, vol. 25, issue 11, 1222-1234

Abstract: We developed a new technique for extracting patient-specific inflow conditions, such as the pulse cycle duration and blood flow velocity, from four-dimensional digital subtraction angiography images and experimentally examined its validity. The maximum error between the values extracted by the technique and measured values was 14.3%. We performed blood flow simulations and calculated representative haemodynamic parameters. The maximum differences between the parameters obtained using general and patient-specific inflow conditions were approximately 400%, 150%, and 50% for the velocity, normalised wall shear stress, and pressure loss coefficient, respectively. These results indicate that patient-specific conditions are critical for accurately reproducing aneurysmal haemodynamics.

Date: 2022
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DOI: 10.1080/10255842.2021.2005035

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