Inversion formulae for the $mathrm{cosh}$-weighted Hilbert transform

Inversion formulae for the $mathrm{cosh}$-weighted Hilbert transform
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$mathrm{cosh}$加权希尔伯特变换的反演公式

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发表时间:
2013
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通讯作者:
A. Tovbis
A. Tovbis
中科院分区:
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文献类型:
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作者:
M. Bertola;A. Katsevich;A. Tovbis

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在本文中,我们开发的公式反演所谓的余弦加权希尔伯特变换Hμ,这出现在单光子发射计算机断层扫描(SPECT)。该公式在理论上是精确的,需要的数据量最小,并且类似于有限希尔伯特变换(FHT)H 0的经典反演公式。我们还找到了Lp(p > 1)中Hμ的零空间和Hμ的取值范围。类似于FHT,零空间在Lp中是一维的,对于任何p ∈(1,2),并且对于p ≥ 2是平凡的。证明了当Hμ作用在Lp空间p ∈(1,∞),p = 2之间时,它是一个指标为−1的Fredholm算子.最后,在p = 2的情况下,我们找到了Hμ的值域条件,这与FHT H 0的值域条件相似。我们的工作是基于Riemann-Hilbert问题的方法。
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.