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Improvement of a 4-Channel Spiral-Loop RF Coil Array for TMJ MR Imaging at 7T  

Kim, Kyoung-Nam (Neuroscience Research Institute, Gachon University)
Kim, Young-Bo (Neuroscience Research Institute, Gachon University)
Cho, Zang-Hee (Neuroscience Research Institute, Gachon University)
Publication Information
Investigative Magnetic Resonance Imaging / v.16, no.2, 2012 , pp. 103-114 More about this Journal
Abstract
Purpose : In an attempt to further improve the radiofrequency (RF) magnetic ($B_1$) field strength in temporomandibular joint (TMJ) imaging, a 4-channel spiral-loop coil array with RF circuitry was designed and compared with a 4-channel single-loop coil array in terms of $B_1$ field, RF transmit (${B_1}^+$), signal-to-noise ratio (SNR), and applicability to TMJ imaging in 7T MRI. Materials and Methods: The single- and 4-channel spiral-loop coil arrays were constructed based on the electromagnetic (EM) simulation for the investigation of $B_1$ field. To evaluate the computer simulation results, the $B_1$ field and ${B_1}^+$ maps were measured in 7T. Results: In the EM simulation result and MRI study at 7T, the 4-channel spiral-loop coil array found a superior $B_1$ performance and a higher ${B_1}^+$ profile inside the human head as well as a slightly better SNR than the 4-channel single-loop coil array. Conclusion: Although $B_1$ fields are produced under the influence of the dielectric properties of the subject rather than the coil configuration alone at 7T, each RF coil exhibited not only special but also specific characteristics that could make it suited for specific application such as TMJ imaging.
Keywords
Radiofrequency (RF); Magnetic resonance imaging (MRI); Ultrahigh-Field (UHF); $B_1$ transmit; Temporomandibular joint (TMJ);
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