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. Author manuscript; available in PMC: 2009 Dec 28.
Published in final edited form as: IEEE Trans Med Imaging. 2008 Aug;27(8):1071–1083. doi: 10.1109/TMI.2008.918328

Fig. 5.

Fig. 5

Effect of using depth compression factors upon projection time (left) and accuracy measures (right). Here, the FWHM characterizes the axial profile of the 13-mm sphere in the NEMA phantom reconstructed image, and %RMSE provides a measure of accuracy for projections of the modified Shepp-Logan phantom at ring difference δ = 20. Projection times dropped quickly with compression factors up to about 8, whereas accuracy was largely unaffected for compression factors of 8 and below. These results indicate that using a compression factor of 4 or 8 (for a 128 × 128 image) offers significant speedup of the rotate-and-slant projector without a significant concomitant loss of accuracy.