Pulsatile motion effects on 3D magnetic resonance angiography: implications for evaluating carotid artery stenoses

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
O Al-KwifiGraham A Wright

Abstract

In-plane carotid artery motion during a 3D MR angiography (MRA) scan can significantly degrade the resulting image resolution. This study characterizes the effect of cardiac pulsatility on 3D contrast-enhanced (CE) MRA with elliptical centric acquisitions using a point-spread function (PSF) analysis. Internal carotid artery (ICA) motion was collected from volunteers and patients using both MR and ultrasound (US) scans. After measuring the carotid artery motion displacement, a simulation was performed which calculated the blurring effects for three different protocols: nongated and two different cardiac gating schemes. The motion sensitivity of each protocol was evaluated for different spatial resolutions. The selection of optimal imaging parameters for a given scan time was investigated. The final results showed that cardiac-gated acquisitions only over a limited region of k-space high spatial frequencies are more time-efficient than cardiac gating for the entire k-space, as it allows for higher resolutions to be achieved and for capturing the arterial phase with low spatial frequencies. Selecting the optimal gating parameters depends directly on the motion characteristics of each individual. Our initial clinical experience is ...Continue Reading

References

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Citations

Jul 16, 2011·Journal of Magnetic Resonance Imaging : JMRI·Dean JefferyAlan H Wilman
Jul 25, 2012·Journal of Magnetic Resonance Imaging : JMRI·Maarten A G MerkxMarcel Breeuwer
Jun 28, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jason MendesSeong-Eun Kim
Dec 14, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Zhaoyang FanDebiao Li
Jun 15, 2006·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Raphael R RonenBrian K Rutt
Feb 8, 2006·Journal of Magnetic Resonance Imaging : JMRI·Loic BousselJean Michel Serfaty

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