Inversion formulae for the $mathrm{cosh}$-weighted Hilbert transform
Inversion formulae for the $mathrm{cosh}$-weighted Hilbert transform
复制标题
$mathrm{cosh}$加权希尔伯特变换的反演公式
DOI:
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发表时间:
2013
期刊:
影响因子:
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通讯作者:
A. Tovbis
中科院分区:
文献类型:
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作者:
M. Bertola;A. Katsevich;A. Tovbis
In this paper we develop formulae for inverting the so-called coshweighted Hilbert transform Hμ, which arises in Single Photon Emission Computed Tomography (SPECT). The formulae are theoretically exact, require a minimal amount of data, and are similar to the classical inversion formulae for the finite Hilbert transform (FHT) H0. We also find the null-space and the range of Hμ in Lp with p > 1. Similarly to the FHT, the null-space turns out to be one-dimensional in Lp for any p ∈ (1, 2) and trivial – for p ≥ 2. We prove that Hμ is a Fredholm operator of index −1 when it acts between the Lp spaces, p ∈ (1,∞), p = 2. Finally, in the case where p = 2 we find the range condition for Hμ, which is similar to that for the FHT H0. Our work is based on the method of the Riemann-Hilbert problem.