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. Author manuscript; available in PMC: 2011 Jul 1.
Published in final edited form as: J Comput Assist Tomogr. 2010 Jul;34(4):570–574. doi: 10.1097/RCT.0b013e3181d564e8

Figure 1.

Figure 1

Comparison of the acquisition strategies for the interleaved (A) and non-interleaved (B) velocity encoding phase-contrast techniques. (A) Temporal window for each velocity/magnitude pair is 7 TRs (time to collect all positive or all negative encodings) with a 1TR offset between positively and negatively velocity encoded images, providing velocity measurements every 8 TRs. (B) Temporal window for each image is 4 TRs with a 4TR offset between positively and negatively velocity encoded images, which, with appropriate processing of ROIs, produces velocity measurements every 4 TRs. Phase-difference is derived from subtracting spline curves fit between the two sets of data points.