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Different excitation and reception distributions with a single‐loop transmit‐receive surface coil near a head‐sized spherical phantom at 300 MHz
Author(s) -
Collins C.M.,
Yang Q.X.,
Wang J.H.,
Zhang X.,
Liu H.,
Michaeli S.,
Zhu X.H.,
Adriany G.,
Vaughan J.T.,
Anderson P.,
Merkle H.,
Ugurbil K.,
Smith M.B.,
Chen W.
Publication year - 2002
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.10153
Subject(s) - imaging phantom , excitation , electromagnetic coil , physics , signal (programming language) , head (geology) , intensity (physics) , optics , nuclear magnetic resonance , precession , excited state , acoustics , atomic physics , computational physics , computer science , astronomy , quantum mechanics , geomorphology , programming language , geology
Calculations and experiments were used to examine the B 1 field behavior and signal intensity distribution in a 16‐cm diameter spherical phantom excited by a 10‐cm diameter surface coil at 300 MHz. In this simple system at this high frequency very complex RF field behavior exists, resulting in different excitation and reception distributions. Included in this work is a straightforward demonstration that coil receptivity is proportional to the magnitude of the circularly polarized component of the B 1 field that rotates in the direction opposite to that of nuclear precession. It is clearly apparent that even in very simple systems in head‐sized samples at this frequency it is important to consider the separate excitation and reception distributions in order to understand the signal intensity distribution. Magn Reson Med 47:1026–1028, 2002. © 2002 Wiley‐Liss, Inc.