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Abstract #2472

Inherent velocity encoding in EPI-based phase contrast MRI using a modified flyback approach

Simon Blömer1, Rüdiger Stirnberg1, and Tony Stöcker1,2
1Deutsches Zentrum für Neurodegenerative Erkrankungen, Bonn, Germany, 2University of Bonn, Bonn, Germany

Synopsis

Keywords: Velocity/Flow, Velocity & Flow

Motivation: Conventional EPI-based phase contrast (PC) suffers from reduced velocity encoding (Venc) accuracy. The interleaved flyback approach produces two images with inherent Venc in readout direction through alternating readout gradients.

Goal(s): To demonstrate, as a proof-of-concept, that the inherent Venc is not only time-efficient but also improves accuracy of EPI-based velocity encoding.

Approach: Velocity encoding is given by the phase difference between the positive and negative readout images obtained from the interleaved flyback method. Additional gradient moment smoothing reduces phase encoding artifacts.

Results: Preliminary results indicate alignment with the Venc of a GRE-based sequence with a 33% reduction in acquisition time.

Impact: Interleaved flyback EPI achieves velocity encoding through the readout gradients rather than Venc gradients and simultaneously addresses key limitations of conventional EPI-based Venc. If shown to match gold-standard accuracy, it could reduce acquisition times by one-third.

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Keywords