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Abstract #0899

Nonlinear projection imaging with the Bloch-Siegert shift in an inhomogeneous B0 at low-field

Kartiga Selvaganesan1, Yonghyun Ha2, Basong Wu2, Kasey Hancock3, Charles Rogers III2, Sajad Hosseinnezhadian2, Gigi Galiana2, and Todd Constable2
1Biomedical Engineering, Yale University, New Haven, CT, United States, 2Radiology and Biomedical Imaging, Yale University, New Haven, CT, United States, 3Electrical Engineering, Yale University, New Haven, CT, United States

The ability to form an image without using spatial encoding gradients allows for cheaper MRI manufacturing costs, particularly in small low field devices suitable for point-of-care imaging. The Bloch-Siegert shift effect provides an RF alternative to spatial encoding with gradient coils. This work presents a new approach to evaluate and optimize nonlinear RF encoding schemes generated by transmit phased arrays. From thousands of possible encoding patterns, the algorithm finds the set that minimizes correlations between spatial patterns while maximizing the spatial encoding. Simulated images demonstrate that the nonlinear spatial encodings provided by Bloch-Siegert RF pulses can provide high image quality.

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