Dipolectric antenna for high-field MRI

被引:3
作者
Wenz, Daniel [1 ,2 ]
Xin, Lijing [1 ,2 ]
Dardano, Thomas [1 ,2 ]
Kuehne, Andre [3 ]
机构
[1] CIBM Ctr Biomed Imaging, Lausanne, Switzerland
[2] Ecole Polytech Fed Lausanne EPFL, Anim Imaging & Technol, Lausanne, Switzerland
[3] Brightmind AI GmbH, Vienna, Austria
关键词
7; T; brain MRI; dielectric resonator; dipole antenna; dipolectric; RF coil; DIELECTRIC RESONATOR; ARRAY; COIL; DESIGN; 8-CHANNEL; LOOP;
D O I
10.1002/mrm.29719
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Purpose: To introduce the dipolectric antenna: a novel RF coil design for high-field MRI using a combination of a dipole antenna with a loop-coupled dielectric resonator antenna. Methods: Simulations in human voxel model Duke involving 8-, 16-, and 38- channel dipolectric antenna arrays for brain MRI were conducted. An 8-channel dipolectric antenna for occipital lobe MRI at 7 T was designed and constructed. The array was built of four dielectric resonator antennas (dielectric constant= 1070) and four segmented dipole antennas. In vivo MRI experiments were conducted in one subject, and the SNR performance was benchmarked against a commercial 32-channel head coil. Results: A 38-channel dipolectric antenna array provided the highest whole-brain SNR (up to a 2.3-fold SNR gain in the center of the Duke's head vs. an 8-channel dipolectric antenna array). Dipolectric antenna arrays driven in dipole-only mode (with dielectric resonators used as receive-only) yielded the highest transmit performance. The constructed 8-channel dipolectric antenna array provided up to threefold higher in vivo peripheral SNR when compared with a 32-channel commercial head coil. Conclusion: Dipolectric antenna can be considered a promising approach to enhance SNR in human brain MRI at 7 T. This strategy can be used to develop novel multi-channel arrays for different high-field MRI applications.
引用
收藏
页码:1695 / 1712
页数:18
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