Title :
A variable power combiner for high-field 7-Tesla MRI
Author :
Yazdanbakhsh, Pedram ; Solbach, Klaus
Author_Institution :
Hochfrequenztech., Univ. Duisburg-Essen, Duisburg, Germany
Abstract :
This paper presents a variable power combiner which is designed and fabricated for our 7-Tesla Magnetic Resonance Imaging (MRI) system. Using this variable power combiner our 16-channel coil (Antenna) array system, consisting of a 16×16 Butler Matrix and 16-channel coil array, can be excited at different power distributions with prescribed both amplitudes and phases. Vector modulator phase and amplitude weights are calculated based on the S-matrix of the combiner network and the prescribed output amplitudes and phases. The design concepts and procedures are verified by a proof-of-concept experiment.
Keywords :
S-matrix theory; amplifiers; antenna arrays; coils; magnetic resonance imaging; Butler matrix; MRI; S-matrix; antenna array system; high-field MRI; magnetic resonance imaging; power distributions; proof-of-concept experiment; variable power combiner; vector modulator phase; Amplitude modulation; Butler matrix; Coils; Dielectric substrates; Magnetic resonance imaging; Phase modulation; Phased arrays; Power amplifiers; Power combiners; Radio frequency; Butler Matrix; Variable Power Combiner; Vector Modulator;
Conference_Titel :
Microwave Conference, 2010 German
Conference_Location :
Berlin
Print_ISBN :
978-1-4244-4933-0
Electronic_ISBN :
978-3-9812668-1-8
