Abstract #0316

Advanced Gradient-Free Selective Excitation Using the Bloch-Siegert Shift

Jonathan B Martin¹, Sai Abitha Srinivas¹, Christopher Vaughn¹, Heng Sun¹, Mark Griswold^2,3, and William Grissom^1,4

¹Biomedical Engineering, Vanderbilt University, Nashville, TN, United States, ²Department of Radiology, Case Western Reserve University, Cleveland, OH, United States, ³Biomedical Engineering, Case Western Reserve University, Cleveland, OH, United States, ⁴Electrical Engineering, Vanderbilt University, Nashville, TN, United States

Synopsis

A class of selective RF pulses which use the Bloch-Siegert shift to localize selective excitation without B₀ gradients has recently been proposed. Here we report an improved design method for both the frequency-gradient inducing component pulse and the frequency-selective component pulse, which reduces ripple in the magnetization profile and produces flatter passbands across the excited B₁⁺ range. The pulses’ production of multiphoton resonances across B₁⁺ and their suitability for fast gradient-free CPMG imaging are investigated. They are deployed for the first time on a low-field scanner to produce slice-selective selection.

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