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. Author manuscript; available in PMC: 2014 Jun 7.
Published in final edited form as: Magn Reson Med. 2011 Dec 21;68(1):120–129. doi: 10.1002/mrm.23217

Table 1.

Average k-space deviations from the measured trajectory to the original trajectory and to trajectories estimated with the average delay and LTI models based on triangle and chirp waveforms.

Axial Spiral Oblique EPI 3D Cones
x y Overall x y z Overall x y z Overall
Signa Excite
Original 0.83 0.80 1.28 0.76 0.55 0.30 1.04 0.64 0.64 0.18 1.02
Average Delay 0.21 0.14 0.28 0.24 0.12 0.12 0.33 0.10 0.09 0.10 0.19
LTI (triangle) 0.13 0.05 0.15 0.25 0.10 0.08 0.31 0.10 0.06 0.04 0.14
LTI Delay (chirp) 0.21 0.14 0.27 0.23 0.12 0.13 0.34 0.10 0.08 0.09 0.18
LTI (chirp) 0.09 0.04 0.10 0.20 0.05 0.09 0.24 0.07 0.05 0.04 0.11

Signa HDxt
Original 0.83 0.74 1.21 0.70 0.50 0.21 0.93 0.72 0.62 0.17 1.06
Average Delay 0.14 0.15 0.22 0.14 0.11 0.09 0.23 0.11 0.08 0.08 0.18
LTI (triangle) 0.38 0.19 0.45 0.28 0.16 0.16 0.39 0.33 0.13 0.09 0.40
LTI Delay (chirp) 0.14 0.14 0.21 0.15 0.11 0.09 0.23 0.09 0.07 0.08 0.16
LTI (chirp) 0.08 0.04 0.09 0.08 0.09 0.09 0.19 0.08 0.04 0.04 0.12

Values are in units of 1/FOV. The overall error is calculated in 2D k-space for the spiral and EPI trajectories and 3D k-space for the 3D cones trajectory.