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Proceedings Paper

Optimal Slice Characterization In Circular Tomosynthesis
Author(s): Urs E. Ruttimann; Xiang-lin Qi; Richard L. Webber
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Paper Abstract

In circular tomosynthesis, object detail at a distance from the plane of interest is blurred according to the zero order Bessel function, whose main lobe defines slice thickness, while its ringing side lobes permit further outlying structures to "leak" through. Using the orthogonality of the Bessel functions, a set of sampling cone opening angles was specified such that the corresponding blurring functions formed an orthogonal basis over a finite distance from the reference plane. This basis set was used to synthesize by a Fourier- Bessel series a window function defining slice thickness with superior side lobe suppression. The window function that concentrates the most "energy" within a finite interval for a fixed number of sampling cones is the circular prolate function. Its application permitted tomosynthesis of 3 mm thick slices at a spatial resolution of 0.5 mm by using only 3 sampling cones with opening angles 1.9, 4.4, and 6.9°, yielding a suppression of the first side lobe of -38 dB, as compared to -8 dB achieved with the Bessel function.

Paper Details

Date Published: 27 June 1988
PDF: 8 pages
Proc. SPIE 0914, Medical Imaging II, (27 June 1988); doi: 10.1117/12.968706
Show Author Affiliations
Urs E. Ruttimann, NIH (United States)
Xiang-lin Qi, NIH (United States)
Richard L. Webber, NIH (United States)

Published in SPIE Proceedings Vol. 0914:
Medical Imaging II
Samuel J. Dwyer; Roger H. Schneider; Roger H. Schneider; Samuel J. Dwyer; Samuel J. Dwyer; Roger H. Schneider, Editor(s)

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