Key result
Phase-encoding reordered cardiac gating boosts MRA signal intensity over conventional techniques with minimal time penalty.
Why the study?
The appearance of MR angiographic images of pulsatile flow depends on the relationship of phase-encoding steps to the pulsatile flow waveform, and optimal k-space encoding strategies need evaluation.
Cardiac-phase gating with phase-encoding reordering can improve signal intensity in MR angiography of pulsatile flow with minimal acquisition time penalties.
May improve pulsatile-flow MR angiography; leaves open clinical cardiac translation from phantom data.
Signal strength in time-of-flight magnetic resonance (MR) angiography of pulsatile flow is modulated by the time-varying intraluminal magnetization strength. The specific appearance of MR angiographic images therefore depends on the relationship of different phase-encoding steps to the pulsatile flow waveform. Cardiac-phase gating can be applied with phase-encoding reordering to acquire different regions of k-space during the desired phases of the cardiac cycle. The authors have developed a simulation program for evaluating the merits of different encoding strategies for pulsatile flow. The model was validated with phantom studies. High signal intensity relative to that in conventional MR angiographic studies can be attained with strategies that impose relatively small penalties in total acquisition time.
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Franck et al. (1995) studied Pulsatile flow imaging. Cardiac-phase gating with phase-encoding reordering vs. Conventional MR angiographic studies was evaluated on Signal intensity. Cardiac-phase gating with phase-encoding reordering attained high signal intensity relative to conventional MR angiography with relatively small penalties in total acquisition time in phantom studies.
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