Spiral volume coil for improved RF field homogeneity at high static magnetic field strength

被引:78
作者
Alsop, DC [1 ]
Connick, TJ [1 ]
Mizsei, G [1 ]
机构
[1] Univ Penn, Med Ctr, Dept Radiol, Philadelphia, PA 19104 USA
关键词
RF coils; high-field MRI; brain;
D O I
10.1002/mrm.1910400107
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
Biological samples have a high dielectric constant that can shorten RF wavelengths by a factor of 8 relative to the vacuum. At high field strengths, finite wavelength effects within larger samples are the dominant cause of RF field nonuniformity. A coil design is presented that can reduce and even eliminate this inhomogeneity; 4-T images in phantoms and in the head of a normal volunteer are presented, which demonstrate improved homogeneity relative to a standard coil. This coil design should aid in realizing the potential advantages of imaging large samples at high field strengths.
引用
收藏
页码:49 / 54
页数:6
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