| Literature DB >> 21402488 |
Alexander C Wright1, Rostislav Lemdiasov, Thomas J Connick, Yusuf A Bhagat, Jeremy F Magland, Hee Kwon Song, Steven P Toddes, Reinhold Ludwig, Felix W Wehrli.
Abstract
A Helmholtz-pair local transmit RF coil with an integrated four-element receive array RF coil and foot immobilization platform was designed and constructed for imaging the distal tibia in a whole-body 7T MRI scanner. Simulations and measurements of the B(1) field distribution of the transmit coil are described, along with SAR considerations for operation at 7T. Results of imaging the trabecular bone of three volunteers at 1.5T, 3T and 7T are presented, using identical 1.5T and 3T versions of the 7T four-element receive array. The spatially registered images reveal improved visibility for individual trabeculae and show average gains in SNR of 2.8× and 4.9× for imaging at 7T compared to 3T and 1.5T, respectively. The results thus display an approximately linear dependence of SNR with field strength and enable the practical utility of 7T scanners for micro-MRI of trabecular bone.Entities:
Mesh：
Year: 2011 PMID： 21402488 PMCID： PMC3085966 DOI： 10.1016/j.jmr.2011.02.019
Source DB: PubMed Journal: J Magn Reson ISSN： 1090-7807 Impact factor: 2.229