Rapid flow quantification in iliac arteries with spiral phase-contrast MRI

Abstract

Phase contrast MRI is a powerful tool for blood flow quantification. Conventional cartesian phase contrast sequences require lengthy acquisition on the order of several minutes. Spiral acquisition phase-contrast (PC) MRI is capable of reducing the TR and TE in order to minimize flow dependent artifacts and total imaging time. Despite this, in general, spiral phase contrast sequences suffer from off-resonance artifacts and inconsistent data artifacts. In this work, we show that short interleaved spiral readout trajectories have the capability to obtain high spatio-temporal resolution flow images in the common iliac artery distal to the aortoiliac bifurcation with little or no artifacts and with significant savings in image acquisition time over the Cartesian trajectory. To verify the accuracy, we compare our results with a Conventional cartesian trajectory.

Radiofrequency saturation induced bias in aqueductal cerebrospinal fluid flow quantification obtained using two‐dimensional cine phase contrast magnetic resonance imaging

“…Motion artifacts are also a cause for concern for PCMRI data acquired using Cartesian trajectories. Artifacts due to pulsatile flow observed in Cartesian acquisitions can be mitigated using non-Cartesian acquisitions (7,8). In this work, the in vivo data were collected using spiral trajectories to mitigate these effects.…”

4D reduced TE (RTE) spiral phase contrast NRI for rapid quantification and visualization of blood flow and hemodynamics.

“…Similar to Nayak et al, previously a rapid 2D Spiral Phase Contrast technique with short echo and scan times for imaging the iliac artery was proposed [50]. Scan parameters were: spatial resolution = 1.5*1.5 mm 2 , slice thickness = 5 mm, FOV = 250*250 mm 2 , Venc = 100 cm/s, segmentation factor (TFE factor) = 3, temporal resolution = 42 ms, TE/TR = 2.6 / 7 ms for spiral acquisition and TE/TR= 4.1/7 ms for Cartesian acquisition.…”

“…Time resolved 2D Cine PC MRI is an acquisition gated to the ECG signal which makes it possible to observe temporal variation of velocities and flow at a single 2D slice location within a breath-hold [26,50]. 4D flow imaging is a 3D gated acquisition and offers the ability to encode all three velocity directions in a 3D spatial volume through time.…”

4D ultra-short TE (UTE) phase-contrast MRI for assessing stenotic flow and hemodynamics.

“…The proposed 3-D UTE PC MRI technique was compared with the conventional Cartesian PC MRI technique as well as with our group's previously published spiral PC MRI method [187]. With reduced TE, the spiral acquisition resulted in reduced signal loss and phase error in the magnitude and the velocity image.…”