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K-T Points Design Choices

K-T Points Design Choices. Scan Parameters. Phantom @7T, sagittal 2D 64x64 B-S B1 map 5mm slice resolution Ran many iterations of kzfast3d_1ch.m to explore the design space and its predicted output B1 B0 inhomogeneity is ignored. Design Requirements.

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K-T Points Design Choices

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  1. K-T Points Design Choices

  2. Scan Parameters • Phantom @7T, sagittal • 2D 64x64 B-S B1 map • 5mm slice resolution • Ran many iterations of kzfast3d_1ch.m to explore the design space and its predicted output B1 • B0 inhomogeneity is ignored

  3. Design Requirements • Choose parameters that has best uniformity given these constraints: • TR < 5ms • Max FA >= 60 deg. • SAR, need to figure out how to relate computed RF power to this

  4. Partial Dependence on # Subpulses and RF Power Penalty

  5. Questions • What is the criterion used for uniformity? • Given a # of subpulses and their width, should the error criterion be monotonically increasing with greater RF penalty? • Will always be achieving less uniformity, so 1st term is always increasing, can weighted RF power term be any smaller with a change in penalty?

  6. Partial Dependence on Subpulse Width and RF Power Penalty

  7. Partial Dependence on # Subpulses and Subpulse Width

  8. # Subpulses vs. RF Power Penalty with Subpulse Width changing in time

  9. Conclusions • 12-18 subpulses • 1-7 RF penalty • 0.12-0.2 ms subpulse width, but depends on B0

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