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Temporal phase unwrapping for cine velocity imaging

✍ Scribed by Qing-San Xiang

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
753 KB
Volume
5
Category
Article
ISSN
1053-1807

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✦ Synopsis

Abstract

A simple algorithm named temporal phase unwrapping (TPU) is introduced to address the phase aliasing problem in time‐dependent pa contrast (CINE‐PC) velocity imaging. The method exploits the temporal continuity of velocity field and unwraps the phmc along time. TPU only involver a one‐dimensional (1D) temporal integration: therefore. many complications in 2D or 3D spatial phpee unwrapping are avoided. Differential velocity map (DVM) between adjacent movie framer arc first calculated from the complex MR imager. The DVM. have no phase aliasing no the differential velocities arc much smaller than the absolute velocities. ‐–free velocity maps are obtained by integrating the DVMs along the time direction provided M aliasing‐free reference velocity map (RVM) is found as a starting point of the integration. typically, much RVMs are always available within the cardiac cycle, especially in diastole where the blood flow is the lowest. In vivo rceults from fully automated processing and detailed discussion on noise behavior are presented.

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