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Parameter Calculation

YZ Yahui Zhang
ZM Zhouming Mai
JD Jianhang Du
WZ Wenjuan Zhou
WW Wenbin Wei
HW Hui Wang
CY Chun Yao
XZ Xinxia Zhang
HH Hui Huang
GW Guifu Wu
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Parameters, PSV, RI, peak diastolic velocity (VD), PSV/VD (VS/VD), and velocity-time integral (VTI) in the CCAs were continuously recorded for 10 s and then were calculated for mean value.

The mean IDs of all arteries were calculated as:

where IDsys and IDdia are the systolic and diastolic diameters, respectively.

RI was analyzed only in the carotid arteries because, as a measure of cerebral resistance, it is closely associated with cardiovascular risk was calculated as:

where PSV is the peak systolic velocity (PSV), and EDV is the end-diastolic velocity (EDV).

Flow rate (FR) was calculated from the vessel diameter, cardiac period, and velocity-time integral as:

where VTI is the averaged velocity-time integral, and T is the averaged cardiac cycle time.

Copyright and License information:  ©2021 Zhang, Mai, Du, Zhou, Wei, Wang, Yao, Zhang, Huang and Wu.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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