Conjecture on the refined reconstruction formula for discrete Radon transform data

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Let x0x_0 be a generic point, let H0H_0 have well-behaved level sets in the sense that any open interval of length L≥L0L\ge L_0 contains at most ρL\rho L points of any level set H0−1(t^)H_0^{-1}(\hat t), and assume the hypotheses of the paper's main resolution theorem. Let KK be the reconstruction kernel, fϵf_\epsilon the reconstructed function, and fϵrecf_\epsilon^{\mathrm{rec}} the reconstructed output. For xˇ\check x in a compact set, the proposed refined formula is Refined DTB conjecture.

fϵrec(x0+ϵxˇ)=1ϵ2∬K((x0+ϵxˇ)−yϵ)fϵ(y) dy+O(ϵ1/2ln⁡(1/ϵ)),ϵ→0,f_\epsilon^{\mathrm{rec}}(x_0+\epsilon\check x)=\frac{1}{\epsilon^2}\iint K\left(\frac{(x_0+\epsilon\check x)-y}{\epsilon}\right)f_\epsilon(y)\,\mathrm{d}y+O(\epsilon^{1/2}\ln(1/\epsilon)),\qquad \epsilon\to0,

with the big-OO term uniform for xˇ\check x in any compact set. This conjecture is guided by numerical evidence and the preceding partial lemma; the supplied text does not state that it has been proved or disproved.

References

Primary source

Alexander Katsevich, “Resolution of 2D reconstruction of functions with nonsmooth edges from discrete Radon transform data”, arXiv:2112.10286 (2021).

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