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Updated: May 14, 2026
Laser Doppler Perfusion Imaging in the Mouse Hindlimb
Published on: April 18, 2021
Rapid measurement of arterial input function in mouse tail from projection phases
Jennifer Moroz1, Clayton L Wong, Andrew C Yung
1Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada.
Purpose:
To measure the arterial input function (AIF) in a mouse tail at high temporal resolution with signal phase of MR projections.
Methods:
The technique involves the acquisition of one 2D image before injection, followed by a series of projections before, during, and after contrast injection. Differences in the signal phase, relative to the mean preinjection phase, were calculated and converted into a concentration of Gd.
Results:
An AIF with a temporal resolution of 100 ms was measured and verified with colorimetry (in a flow phantom) and mass spectrometry analysis (in vivo). The projection-based AIF is expected to better represent the rapid contrast kinetics in the blood following injection, thus improving the accuracy of quantitative dynamic contrast-enhanced-MRI analysis. Colorimetry experiments confirmed that signal phase is preferred over magnitude for a precise determination of an AIF. In-vivo experiments demonstrate the feasibility of our approach in mice.
Conclusion:
AIFs can be measured quickly and precisely using phase from projections. Phase data are sensitive to the flow velocity; but this sensitivity is significantly reduced when flow compensation was used.
