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Errors in T2 estimation using multislice multiple-echo imaging

✍ Scribed by A. P. Crawley; R. M. Henkelman

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 801 KB
Volume: 4
Category: Article
ISSN: 0740-3194
DOI: 10.1002/mrm.1910040105

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✦ Synopsis

Accurate T2 images calculated from multiple-echo sequences are difficult to obtain over a number of contiguous slices due to the presence of unwanted echoes that are generated at the slice edges. This problem is similar to problems encountered in single-slice imaging in the presence of rf pulse imperfections. In this paper, we use computer simulations to show that all unwanted echoes can be eliminated by defocusing them using additions to the slice-selection gradients. Accurate T2 images may then be calculated from the remaining echoes. We also present a method of experimentally displaying the slice shapes of unwanted echoes generated by a multislice imaging sequence.

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