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Parallel transmit and receive technology in high‐field magnetic resonance neuroimaging
Author(s) -
Webb Andrew G.,
Collins Christopher M.
Publication year - 2010
Publication title -
international journal of imaging systems and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.359
H-Index - 47
eISSN - 1098-1098
pISSN - 0899-9457
DOI - 10.1002/ima.20219
Subject(s) - neuroimaging , preamplifier , sensitivity (control systems) , computer science , signal (programming language) , flexibility (engineering) , homogeneous , acceleration , nuclear magnetic resonance , power (physics) , physics , acoustics , electronic engineering , amplifier , telecommunications , engineering , neuroscience , mathematics , bandwidth (computing) , statistics , classical mechanics , quantum mechanics , biology , programming language , thermodynamics
The major radiofrequency engineering challenges of high‐field MR neuroimaging are as follows: (1) to produce a strong, homogeneous transmit B 1 field, while remaining within regulatory guidelines for tissue power deposition and (2) to receive the signal with the maximum signal‐to‐noise and the greatest flexibility in terms of utilizing the benefits of parallel imaging. Borrowing from developments in electromagnetic hyperthermia, the first challenge has been met by the use of transmit arrays, in which the input power to each element of the array can be varied in terms of magnitude and phase. Optimization of these parameters, as well as the form of the applied RF pulse, leads to very homogeneous B 1 fields throughout the brain. The design of large receive arrays, using impedance‐mismatched preamplifiers and geometrical overlap for interelement isolation, has resulted in significant sensitivity improvements as well as large acceleration factors in parallel imaging. © 2010 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 20, 2–13, 2010