Premium
Transmit and receive transmission line arrays for 7 Tesla parallel imaging
Author(s) -
Adriany Gregor,
Van de Moortele PierreFrancois,
Wiesinger Florian,
Moeller Steen,
Strupp John P.,
Andersen Peter,
Snyder Carl,
Zhang Xiaoliang,
Chen Wei,
Pruessmann Klaas P.,
Boesiger Peter,
Vaughan Tommy,
Uğurbil Kāmil
Publication year - 2005
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.20321
Subject(s) - stripline , parallel communication , electromagnetic coil , transmission (telecommunications) , channel (broadcasting) , radiofrequency coil , transmission line , sensitivity (control systems) , signal (programming language) , head (geology) , line (geometry) , physics , computer science , nuclear magnetic resonance , optics , electronic engineering , telecommunications , mathematics , engineering , geometry , geomorphology , geology , programming language , quantum mechanics
Transceive array coils, capable of RF transmission and independent signal reception, were developed for parallel, 1 H imaging applications in the human head at 7 T (300 MHz). The coils combine the advantages of high‐frequency properties of transmission lines with classic MR coil design. Because of the short wavelength at the 1 H frequency at 300 MHz, these coils were straightforward to build and decouple. The sensitivity profiles of individual coils were highly asymmetric, as expected at this high frequency; however, the summed images from all coils were relatively uniform over the whole brain. Data were obtained with four‐ and eight‐channel transceive arrays built using a loop configuration and compared to arrays built from straight stripline transmission lines. With both the four‐ and the eight‐channel arrays, parallel imaging with sensitivity encoding with high reduction numbers was feasible at 7 T in the human head. A one‐dimensional reduction factor of 4 was robustly achieved with an average g value of 1.25 with the eight‐channel transmit/receive coils. Magn Reson Med 53:434–445, 2005. © 2005 Wiley‐Liss, Inc.