2017
DOI: 10.1088/1361-6560/aa82ab
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Compton scatter tomography in TOF-PET

Abstract: Scatter coincidences contain hidden information about the activity distribution on the positron emission tomography (PET) imaging system. However, in conventional reconstruction, the scattered data cause the blurring of images and thus are estimated and subtracted from detected coincidences. List mode format provides a new aspect to use time of flight (TOF) and energy information of each coincidence in the reconstruction process. In this study, a novel approach is proposed to reconstruct activity distribution … Show more

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Cited by 13 publications
(9 citation statements)
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“…It should be noted that due to computational complexity, 2-D considerations are not uncommon in recent studies regarding image reconstruction from scattered photons [20, 26, 43]. Furthermore, a more sophisticated imaging model that offers more realistic system matrix components A λ and would be subject to the same measurement equations and lead to the same derivation of MLGA.…”
Section: Discussionmentioning
confidence: 99%
“…It should be noted that due to computational complexity, 2-D considerations are not uncommon in recent studies regarding image reconstruction from scattered photons [20, 26, 43]. Furthermore, a more sophisticated imaging model that offers more realistic system matrix components A λ and would be subject to the same measurement equations and lead to the same derivation of MLGA.…”
Section: Discussionmentioning
confidence: 99%
“…There exists a simple geometrical symmetry for single scattering, as all possible scattering points lie on two circular arcs encompassing the real annihilation point in 2D-PET. The details of 2D loci (circular arcs) were discussed earlier by Conti et al [14] and Hemmati et al [15]. Figure 2 also presents the inner ring with scattering points A and B, corresponding to the original unscattered and tissue-scattered coincident photons, respectively.…”
Section: Locus Of Tissue-scattering Point and 3d Curvesmentioning
confidence: 80%
“…In literature, research for utilizing the scattered data in PET imaging is sparse. Two different approaches, one suggested by Conti et al [14] and another by Hemmati et al [15], are significant efforts in this direction. The former presents the concept of a broken line of response (broken-LOR) with the time of flight (TOF) information for single scattered events.…”
Section: Introductionmentioning
confidence: 99%
“…Incorporation of prior knowledge on the attenuation map can confine the local convergence of the likelihood function and also reduce the cross-talk error and noise in the resulting images. The prior information can be determined in the form of connected regions from MR images [9], local smoothness of the attenuation map [5], histogram-based priors [4,10] and scatter coincidences based information [11,12].…”
Section: Introductionmentioning
confidence: 99%