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Time-Resolved MR Angiography: Optimal Parallel Imaging Method

J.-Y. Gauvrita,b, M. Lawb, J. Xuc, R. Carsonb, P. Sunenshineb and Q. Chenb

a Department of Neuroradiology, EA 2691, Salengro Hospital, University Hospital of Lille, Lille, France
b Department of Radiology, MRI Department, New York University Medical Center, New York, NY
c Siemens Medical Solutions USA Inc., New York, NY


Figure 1
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  		Fig 1. Wrap artifacts with IPAT 2 and 3. Note the wrap artifacts (arrows) due to the use of the higher IPAT 3 (B) reconstruction algorithm compared with the moderate IPAT 2 factor (A).


Figure 2
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  		Fig 2. Axial TR MRA maximum intensity projection reconstructions without IPAT (A) and with IPAT 2 (B) and 3 (C). Note the better visualization of distal MCA (arrows) without IPAT and the similar conspicuity of proximal arterial branches (head arrows) without IPAT (A) compared with IPAT 2 (B). In contrast to the MRA without and with IPAT 2, the noise was slightly increased at IPAT 3 (C).


Figure 3
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  		Fig 3. Axial TR MRA maximum intensity projection reconstructions without IPAT (A) and with IPAT 2 (B) and 3 (C). Note the simultaneous visualization of arterial and venous vessels (arrows) with TR MRA without IPAT (A), whereas the TR MRA with IPAT (B, C) provides the visualization of one arterial phase without venous opacification and the similar conspicuity of proximal arterial branches (head arrows) without IPAT (A) compared with IPAT 2 (B).


Figure 4
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  		Fig 4. Axial TR MRA MIP reconstructions with IPAT 2 after an injection of 10 mL of contrast media. The increased volume of contrast media provides a better visualization of both proximal (head arrows) and distal (arrows) arterial vessels.





Copyright © 2008 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X