Title :
Fast B1 field localisation in high-field MRI systems
Author_Institution :
Dept. of Biomed. Eng., Univ. of Ulsan, Ulsan, South Korea
Abstract :
In high-magnetic magnetic resonance imaging (MRI) systems (7 T and above), the radio frequency (RF) field shows greater inhomogeneity compared with clinical MRI systems (1.5 and 3.0 T). In multi-channel RF coils, driving each coil element with convex optimisation can reduce non-uniformity of the RF field in a region of interest. In this Letter, a periodic compressed method (PCM) and a PCM after averaging are proposed in order to reduce RF coil control time at high fields. Simulation results were obtained using a human head model in 7 and 9.4 T systems, and the results are discussed in detail.
Keywords :
biomedical MRI; brain; coils; data compression; image coding; medical image processing; optimisation; clinical MRI systems; coil element; convex optimisation; fast B1 field localisation; high-field MRI systems; high-magnetic magnetic resonance imaging systems; human head model; magnetic flux density 1.5 T to 9.4 T; magnetic flux density 3.0 T; multichannel RF coils; periodic compressed method; radiofrequency field; region-of-interest;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2013.1335
