High Permittivity Dielectric Pads Improve High Spatial Resolution Magnetic Resonance Imaging of the Inner Ear at 7 T

被引:56
作者
Brink, Wyger M. [1 ]
van der Jagt, Annerie M. A. [2 ]
Versluis, Maarten J. [1 ]
Verbist, Berit M. [3 ,4 ]
Webb, Andrew G. [1 ]
机构
[1] Leiden Univ, Med Ctr, CJ Gorter Ctr High Field MRI, Dept Radiol, NL-2333 ZA Leiden, Netherlands
[2] Leiden Univ, Med Ctr, Dept Otorhinolaryngol Head & Neck Surg, NL-2333 ZA Leiden, Netherlands
[3] Leiden Univ, Med Ctr, Dept Radiol, NL-2333 ZA Leiden, Netherlands
[4] Radboud Univ Nijmegen, Med Ctr, Nijmegen, Netherlands
关键词
inner ear; 7 T MRI; B-1(+) inhomogeneity; dielectric pads; barium titanate; SPIN-ECHO; COCHLEAR NERVE; NORMAL-HEARING; OPTIMIZATION; HOMOGENEITY; LABYRINTH; VERTIGO; TESLA;
D O I
10.1097/RLI.0000000000000026
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
Objectives: The objective of this study was to evaluate the use of dielectric pads for improving high spatial resolution imaging of the inner ear at 7 T. Materials and Methods: Two sets of dielectric pads were designed using electromagnetic simulations and implemented using a deuterated suspension of barium titanate. Their effect on transmit efficiency, contrast homogeneity, and diagnostic image quality was evaluated in vivo (N = 10). In addition, their effect on the specific absorption rate was evaluated numerically. Results: Statistically significant improvements (P < 0.001) in several measures of the image quality were obtained by using dielectric pads. The dielectric pads lead to an increase in the transmit efficiency and uniformity at the location of the inner ear, which is reflected in both an increased contrast homogeneity and an increased diagnostic value. Simulations show that the dielectric pads do not increase the peak local specific absorption rate. Conclusions: Using geometrically tailored dielectric pads enables high spatial resolution magnetic resonance imaging of the human inner ear at 7 T. The high spatial resolution improves the depiction of the fine inner ear structures, showing the benefit of magnetic resonance imaging at ultrahigh fields.
引用
收藏
页码:271 / 277
页数:7
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