Abstract
The aim of this study was to conduct a flow experiment using a cerebrovascular phantom and investigate whether magnetic resonance angiography (MRA) could replace three-dimensional rotational angiography (RA) and computed tomography angiography (CTA) to construct vascular models for computational fluid dynamics (CFD). We performed MRA and 3D cine phase-contrast (PC) MR imaging with a silicone cerebrovascular phantom of an internal carotid artery-posterior communicating artery aneurysm with blood-mimicking fluid, and controlled flow with a flowmeter. We also obtained RA and CTA data for the phantom. Four analysts constructed vascular models based on the three different modalities. These 12 constructed models used flow information based on 3D cine PC MR imaging for CFD. We compared RA-, CTA-, MRA-based CFD results using the micro-CT-based CFD result as the criterion standard to investigate whether MRA-based CFD was not inferior to RA- or CTA-based CFD. We also analyzed the inter-analyst variability. Wall shear stress (WSS) distributions and streamlines of RA- or MRA-based CFD and those of micro-CT-based CFD were similar, but the vascular models and WSS values were different. Accuracy in measurements of blood vessel diameter, cross-sectional maximum velocity, and spatially averaged WSS was the highest for RA-based CFD, followed by MRA-based and CTA-based CFD using micro-CT-based CFD result as the reference. Except maximum velocity from CTA, all other parameters had good inter-analyst agreement using different modalities. The results demonstrated that non-invasive MRA can be used for cerebrovascular CFD models with good inter-analyst agreements.
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Acknowledgements
This work was supported by JSPS KAKENHI (Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research) (Grant Number 25293264).
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This study was funded by JSPS KAKENHI (Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research) (Grant Number 25293264).
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Haruo Isoda has received JSPS KAKENHI (Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research) (Grant Number 25293264).Takafumi Kosugi is an employee of Renaissance of Technology Corporation, Hamamatsu, Japan. Yoshiaki Komori is an employee of Siemens Healthcare K.K., Tokyo, Japan. The remaining authors declare that they have no conflict of interest.
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Our research project has been approved by our institutional review board (IRB). All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants as analysts included in the study. The image data used to create the silicone model was a secondary use of the data used in the relevant previous work already done with informed consent.
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Yoneyama, Y., Isoda, H., Ishiguro, K. et al. Evaluation of magnetic resonance angiography as a possible alternative to rotational angiography or computed tomography angiography for assessing cerebrovascular computational fluid dynamics. Phys Eng Sci Med 43, 1327–1337 (2020). https://doi.org/10.1007/s13246-020-00936-6
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DOI: https://doi.org/10.1007/s13246-020-00936-6