Optimal Slice Characterization In Circular Tomosynthesis

Urs E. Ruttimann; Xiang-lin Qi; Richard L. Webber

doi:10.1117/12.968706

27 June 1988 Optimal Slice Characterization In Circular Tomosynthesis

Urs E. Ruttimann, Xiang-lin Qi, Richard L. Webber

Proceedings Volume 0914, Medical Imaging II; (1988) https://doi.org/10.1117/12.968706
Event: Medical Imaging II, 1988, Newport Beach, CA, United States

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.

Citation Download Citation

Urs E. Ruttimann, Xiang-lin Qi, and Richard L. Webber "Optimal Slice Characterization In Circular Tomosynthesis", Proc. SPIE 0914, Medical Imaging II, (27 June 1988); https://doi.org/10.1117/12.968706

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