title: Transmit and receive transmission line arrays for 7 Tesla parallel imaging.
abstract: Transceive array coils, capable of RF transmission and independent signal reception, were developed for parallel, 1H 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 1H 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.
authors.affiliation: Center for Magnetic Resonance Research, Department of Radiology, School of Medicine, University of Minnesota, Minneapolis, Minnesota 55455, USA. gregor@cmrr.umn.edu
authors.forename: Gregor
authors.initials: G
authors.lastname: Adriany
authors.forename: Pierre-Francois
authors.initials: PF
authors.lastname: Van de Moortele
authors.forename: Florian
authors.initials: F
authors.lastname: Wiesinger
authors.forename: Steen
authors.initials: S
authors.lastname: Moeller
authors.forename: John P
authors.initials: JP
authors.lastname: Strupp
authors.forename: Peter
authors.initials: P
authors.lastname: Andersen
authors.forename: Carl
authors.initials: C
authors.lastname: Snyder
authors.forename: Xiaoliang
authors.initials: X
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Klaas P
authors.initials: KP
authors.lastname: Pruessmann
authors.forename: Peter
authors.initials: P
authors.lastname: Boesiger
authors.forename: Tommy
authors.initials: T
authors.lastname: Vaughan
authors.forename: Kāmil
authors.initials: K
authors.lastname: Uğurbil
mesh_terms: D001921:Brain / Q000033:anatomy & histology* / Q000502:physiology*; D001931:Brain Mapping / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation* / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000295:instrumentation* / Q000379:methods; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers