By Leondes C.T. (ed.)
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Extra info for Medical Imaging Systems Technology: Modalities
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13. Schematic illustration of the numerical phantom used in the aliasing studies described in the text. It comprises cylindrical disks of alternating high and low density. 20 CNaR (dB) 15 10 5 0 -5 -10 0 2 4 6 Pitch 8 Fig. 14. 175 mm−1 . Higher values of CNa R are better. This analysis suggests that pitches near 3, 4, and 5 are optimal and half-integer pitches are suboptimal for four-slice with narrow-kernel interpolation. 26 Patrick J. La Rivi` ere The analysis described implicitly blends sampling and interpolation eﬀects.
Working under the multiple parallel fanbeam approximation, we computed a global contrast-to-aliased noise (CNa R) ﬁgure of merit for each pitch, which we plot in Fig. 14. Higher values of CNa R are better. As expected, the curve is far from monotonic. Local maxima are evident around pitches 3, 4, 5, and 6. Some complicated variation is evident between pitches 1 and 2, with pitch 2 being a clear minimum in the curve. Other minima occur at half-integer pitches. Fig. 13. Schematic illustration of the numerical phantom used in the aliasing studies described in the text.