- Oral presentation
- Open Access
Body-coil nonenhanced MR angiography using highly undersampled radial QISS
© Edelman et al; licensee BioMed Central Ltd. 2013
- Published: 30 January 2013
- Magnetic Resonance Angiography
- Peripheral Arterial Disease
- Acceleration Factor
- Phase Array Coil
- Single Shot Acquisition
Current approaches for magnetic resonance angiography (MRA) require the use of parallel imaging in order to keep scan times short and obtain adequate slice coverage and spatial resolution. However, parallel imaging necessitates the use of phased array coils, which increases setup time and restricts the vascular territory that can be imaged. We hypothesized that using Quiescent-Inflow Single-Shot (QISS) MRA with only the body coil for signal reception and a highly undesampled radial k-space trajectory could obviate the need for phased array coils.
The Institutional Review Board approved the study. Two healthy subjects were imaged on a 1.5T MRI. In addition, four patients with peripheral arterial disease (PAD) were studied. The combination of contrast-enhanced TWIST and stepping table MRA was used as the reference standard. Body array, peripheral and spine phased array elements were used for signal reception with generalized auto-calibrating partially parallel acquisition (GRAPPA) and acceleration factor of 2 for CE-MRA and nonenhanced QISS MRA using a Cartesian k-space trajectory. For body-coil radial QISS, a matrix of 352 projections was obtained using either a single shot acquisition with 60 views and 2 signal averages (undersampling factor = 9.2) or a two-shot acquisition with 180 views and 1 signal average (undersampling factor = 6.1). A phase-based fat suppression technique was applied for two-shot, 180 view radial QISS only.
Using body-coil radial QISS, diagnostic MR angiograms of the peripheral arteries can be obtained using acceleration factors up to 9.2. Streak artifacts from radial undersampling were minimized since QISS images are naturally sparse due to the combination of fat suppression and in-plane RF saturation. Moreover, by eliminating the need for phased array coils, this approach enables extended field of view vascular applications, including whole body vascular imaging, within practical scan times.
This work was supported by The Grainger Foundation and 1R01HL096916.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.