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MRI with zero echo time


Weiger, M; Pruessmann, K P (2012). MRI with zero echo time. In: Harris, R K; Wasylishen, R E. Encyclopedia of Magnetic Resonance. Chichester: John Wiley, 311-321.

Abstract

MRI with zero echo time is a robust, fast, and silent approach for three-dimensional (3-D) imaging of samples with short transverse relaxation times. In this article, the principles of acquiring and reconstructing data with zero echo time are described and complemented by discussions of implementation details, potential limitations, and selected applications, as well as advanced and related techniques.
MR imaging of samples with very short T2s requires spatial encoding and data acquisition to be started and completed rapidly after signal creation. One powerful way of meeting these requirements is with 3-D radial center-out k-space encoding. In particular, when RF excitation is performed after switching on the projection gradient, such schemes achieve an echo time of zero and immediately have available maximum k-space speed.
MRI with zero echo time poses two major challenges. First, RF pulses need to be of high bandwidth to uniformly excite the full range of Larmor frequencies induced by the projection gradient. Second, transmit–receive switching results in an initial period of dead time, because of which a certain range of data in the center of k-space is not acquired. This can be handled by acquisition oversampling in conjunction with algebraic image reconstruction.

Abstract

MRI with zero echo time is a robust, fast, and silent approach for three-dimensional (3-D) imaging of samples with short transverse relaxation times. In this article, the principles of acquiring and reconstructing data with zero echo time are described and complemented by discussions of implementation details, potential limitations, and selected applications, as well as advanced and related techniques.
MR imaging of samples with very short T2s requires spatial encoding and data acquisition to be started and completed rapidly after signal creation. One powerful way of meeting these requirements is with 3-D radial center-out k-space encoding. In particular, when RF excitation is performed after switching on the projection gradient, such schemes achieve an echo time of zero and immediately have available maximum k-space speed.
MRI with zero echo time poses two major challenges. First, RF pulses need to be of high bandwidth to uniformly excite the full range of Larmor frequencies induced by the projection gradient. Second, transmit–receive switching results in an initial period of dead time, because of which a certain range of data in the center of k-space is not acquired. This can be handled by acquisition oversampling in conjunction with algebraic image reconstruction.

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Additional indexing

Item Type:Book Section, not refereed, further contribution
Communities & Collections:04 Faculty of Medicine > Institute of Biomedical Engineering
Dewey Decimal Classification:170 Ethics
610 Medicine & health
Language:English
Date:15 June 2012
Deposited On:20 Feb 2013 09:36
Last Modified:07 Dec 2017 19:40
Publisher:John Wiley
Publisher DOI:https://doi.org/10.1002/9780470034590.emrstm1292
Related URLs:http://www.zora.uzh.ch/56458/

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