New high dielectric constant materials for tailoring the B-1(+) distribution at high magnetic fields

作者：Haines K; Smith N B; Webb A G^*

来源：Journal of Magnetic Resonance, 2010, 203(2): 323-327.

DOI：10.1016/j.jmr.2010.01.003

• Dielectric materials
• High-field MRI
• Transmit arrays
• Electromagnetics

The spatial distribution of electromagnetic fields within the human body can be tailored using external dielectric materials. Here, we introduce a new material with high dielectric constant, and also low background MRI signal. The material is based upon metal titanates, which can be made into a geometrically-formable suspension in de-ionized water. The material properties of the suspension are characterized from 100 to 400 MHz. Results obtained at 7 T show a significant increase in image intensity in areas such as the temporal lobe and base of the brain with the new material placed around the head, and improved performance compared to purely water-based gels.

• 出版日期2010-4