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dc.contributor.authorIramina, Hiraku
dc.contributor.authorHamaguchi, Takumi
dc.contributor.authorNakamura, Mitsuhiro
dc.contributor.authorMizowaki, Takashi
dc.contributor.authorKanno, Ikuo
dc.contributor.alternative伊良皆, 拓
dc.contributor.alternative濱口, 拓
dc.contributor.alternative中村, 光宏
dc.contributor.alternative溝脇, 尚志
dc.contributor.alternative神野, 郁夫
dc.date.accessioned2019-02-26T07:27:12Z-
dc.date.available2019-02-26T07:27:12Z-
dc.date.issued2018-07
dc.identifier.issn0449-3060
dc.identifier.urihttp://hdl.handle.net/2433/236636-
dc.description.abstractWe evaluated two dual-energy cone-beam computed tomography (DE-CBCT) methodologies for a bench-top micro-CBCT system to reduce metal artifacts on reconstructed images. Two filter-based DE-CBCT methodologies were tested: (i) alternative spectral switching and (ii) simultaneous beam splitting. We employed filters of 0.6-mm-thick tin and 0.1-mm-thick tungsten to generate high- and low-energy spectra from 120 kVp X-rays, respectively. The spectral switching method was imitated by two half scans with different filters (pseudo-switching). Filters were placed and between the X-ray tube and a phantom (‘1-u, ’ ‘2-u’), a phantom and a flat panel detector (‘1-d, ’ ‘2-d’), and compared with (iii) two half scans at 80 and 140 kVp [pseudo-(80, 140)]. For the splitting method, two half-width filters were aligned along a rotating axis. Projections were separated into halves and merged with corresponding areas of opposed projections after one full rotation. A solid 30-mm-diameter acrylic phantom and an acrylic phantom with four 5-mm-diameter titanium rods were used. DE images were generated by weighted summation of the high- and low-energy images. The blending factor was changed from 0 to +5 in increments of 0.01. Relative errors (REs) of the linear attenuation coefficients of the two phantoms and the contrast-to-noise ratios (CNRs) between the titanium and acrylic regions were compared. All methods showed zero REs except for the method (2-d). CNRs for pseudo-switching with upstream placement were 1.4-fold larger than CNRs for the pseudo-(80, 140) method. CNRs for the downstream placements were small. It was concluded that the pseudo-switching method with upstream placement is appropriate for reducing metal artifacts.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherOxford University Press (OUP)
dc.rights© The Author(s) 2018. Published by Oxford University Press on behalf of The Japan Radiation Research Society and Japanese Society for Radiation Oncology. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
dc.titleMetal artifact reduction by filter-based dual-energy cone-beam computed tomography on a bench-top micro-CBCT system: concept and demonstration
dc.type.niitypeJournal Article
dc.identifier.jtitleJournal of radiation research
dc.identifier.volume59
dc.identifier.issue4
dc.identifier.spage511
dc.identifier.epage520
dc.relation.doi10.1093/jrr/rry034
dc.textversionpublisher
dc.addressDepartment of Nuclear Engineering, Graduate School of Engineering, Kyoto University・Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University
dc.addressDepartment of Nuclear Engineering, Graduate School of Engineering, Kyoto University
dc.addressDepartment of Nuclear Engineering, Graduate School of Engineering, Kyoto University・Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University
dc.addressDepartment of Nuclear Engineering, Graduate School of Engineering, Kyoto University
dc.addressDepartment of Nuclear Engineering, Graduate School of Engineering, Kyoto University
dc.identifier.pmid29718315
dc.identifier.kaken16J08928
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