title: [The Optimal Reconstruction Parameters by Scatter and Attenuation Corrections Using Multi-focus Collimator System in Thallium-201 Myocardial Perfusion SPECT Study].
abstract: The aim of this study was to reveal the optimal reconstruction parameters of ordered subset conjugates gradient minimizer (OSCGM) by no correction (NC), attenuation correction (AC), and AC+scatter correction (ACSC) using IQ-single photon emission computed tomography (SPECT) system in thallium-201 myocardial perfusion SPECT. Myocardial phantom acquired two patterns, with or without defect. Myocardial images were performed 5-point scale visual score and quantitative evaluations using contrast, uptake, and uniformity about the subset and update (subset×iteration) of OSCGM and the full width at half maximum (FWHM) of Gaussian filter by three corrections. We decided on optimal reconstruction parameters of OSCGM by three corrections. The number of subsets to create suitable images were 3 or 5 for NC and AC, 2 or 3 for ACSC. The updates to create suitable images were 30 or 40 for NC, 40 or 60 for AC, and 30 for ACSC. Furthermore, the FWHM of Gaussian filters were 9.6 mm or 12 mm for NC and ACSC, 7.2 mm or 9.6 mm for AC. In conclusion, the following optimal reconstruction parameters of OSCGM were decided; NC: subset 5, iteration 8 and FWHM 9.6 mm, AC: subset 5, iteration 8 and FWHM 7.2 mm, ACSC: subset 3, iteration 10 and FWHM 9.6 mm.
authors.affiliation: Department of Quantum Medical Technology, Faculty of Health Sciences, Kanazawa University.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Shibutani
authors.forename: Masahisa
authors.initials: M
authors.lastname: Onoguchi
authors.forename: Risa
authors.initials: R
authors.lastname: Funayama
authors.forename: Kenichi
authors.initials: K
authors.lastname: Nakajima
authors.forename: Shinro
authors.initials: S
authors.lastname: Matsuo
authors.forename: Hiroto
authors.initials: H
authors.lastname: Yoneyama
authors.forename: Takahiro
authors.initials: T
authors.lastname: Konishi
authors.forename: Seigo
authors.initials: S
authors.lastname: Kinuya
mesh_terms: D006801:Humans; D055414:Myocardial Perfusion Imaging / Q000295:instrumentation / Q000379:methods*; D009206:Myocardium; D019047:Phantoms, Imaging; D012542:Scattering, Radiation; D013794:Thallium Radioisotopes / Q000032:analysis*; D015899:Tomography, Emission-Computed, Single-Photon / Q000295:instrumentation / Q000379:methods*
chemical_list: D013794:Thallium Radioisotopes