Abstract
Electrical loops are the standard element for the reception of NMR and MRI signals. For the last 20 years, arrays of loops have been employed for imaging extended fields of view with the highest signal-to-noise ratio available. In MRI, traditional excitation has been produced using a built-in body coil that has a relatively uniform radio frequency (RF) magnetic field. Two factors are changing this paradigm. First, whole body MRI systems with field strengths of 3 T or greater are becoming very common with many systems at 7 T. It is impossible to produce a uniform magnetic field through a large region of the body at Larmor frequencies in this range using a single large coil, because of the electrical properties of tissue. Second, new techniques for correction of nonuniformities of excitation and for acceleration of inner volume excitations have been recently developed. Transmit arrays that have the potential to produce a wide range of magnetic field distributions are necessary to take advantage of these techniques. Many challenges confront the developer of robust systems for high-field MRI transmit-array systems but the potential to improve image quality continues to spur innovation to overcome these challenges.
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