{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,21]],"date-time":"2023-10-21T16:41:21Z","timestamp":1697906481609},"reference-count":9,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2007,9,5]],"date-time":"2007-09-05T00:00:00Z","timestamp":1188950400000},"content-version":"vor","delay-in-days":8282,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Systems &amp; Computers in Japan"],"published-print":{"date-parts":[[1985,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>This paper attempts to apply the actual redundancy involved in X\u2010ray CT projection data which have been treated as independent data for the improvement of the image quality of a reconstructed image. It is known that the projection data of an X\u2010ray CT contains random noise, such as photon noise, which has a negative effect on image quality. A simple smoothing filter which generally is used to reduce this effect, causes the degradation of image resolution. Therefore, it is possible to suppress only high\u2010frequency noise components. However, when the structure of the projection data was analyzed, it became clear that projection data contain a large redundancy in determining the lower\u2010frequency components of the image. By properly taking advantage of this redundancy for image reconstruction, it is possible to suppress the low\u2010frequency component. This paper clarifies quantitatively the noise suppression effect using redundancy by comparing the case where redundancy is not used at all with the case where redundancy is used completely.<\/jats:p>","DOI":"10.1002\/scj.4690160410","type":"journal-article","created":{"date-parts":[[2007,7,7]],"date-time":"2007-07-07T10:18:13Z","timestamp":1183803493000},"page":"87-96","source":"Crossref","is-referenced-by-count":0,"title":["Redundancy of projection data and its application to improve the quality of a reconstructed image"],"prefix":"10.1002","volume":"16","author":[{"given":"Itsuo","family":"Kumazawa","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taizo","family":"Iijima","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2007,9,5]]},"reference":[{"issue":"3","key":"e_1_2_1_2_2","first-page":"206","article-title":"New image reconstruction theory for computer tomography","volume":"64","author":"Taizo Iijima","year":"1981","journal-title":"Trans. I.E.C.E., Japan, (D)"},{"issue":"7","key":"e_1_2_1_3_2","first-page":"834","article-title":"Cross\u2010section image reconstruction method from projection image\u2010Equivalent series expansion method to Fourier Transform","volume":"65","author":"Hidemitsu Ogawa","year":"1982","journal-title":"Trans. I.E.C.E., Japan, (D)"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1215\/S0012-7094-75-04256-8"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/0022-247X(74)90078-X"},{"key":"e_1_2_1_6_2","volume-title":"CT Scanner","author":"Iwai Yoshinori"},{"issue":"5","key":"e_1_2_1_7_2","first-page":"271","article-title":"Pseudo\u2010orthogonality Theory","volume":"58","author":"Ogawa","year":"1975","journal-title":"Trans. I.E.C.E., Japan, (D)"},{"issue":"5","key":"e_1_2_1_8_2","first-page":"279","article-title":"Proportional noise suppression method in spatial information transmission systems","volume":"58","author":"Sato","year":"1975","journal-title":"Trans. I.E.C.E., Japan, (D)"},{"issue":"10","key":"e_1_2_1_9_2","first-page":"854","article-title":"A consideration of the even\u2010odd property of sampled points from the standpoint of pseudo\u2010orthogonality","volume":"60","author":"Ogawa","year":"1977","journal-title":"Trans. I.E.C.E., Japan, (D)"},{"issue":"2","key":"e_1_2_1_10_2","article-title":"Coding of real number sequences for.error correction: a digital signal processing problem","volume":"2","author":"Marshall T.G.","year":"1984","journal-title":"I.E.E.E. Jour. Selected areas in communications"}],"container-title":["Systems and Computers in Japan"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2Fscj.4690160410","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/scj.4690160410","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,20]],"date-time":"2023-10-20T15:25:20Z","timestamp":1697815520000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/scj.4690160410"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1985,1]]},"references-count":9,"journal-issue":{"issue":"4","published-print":{"date-parts":[[1985,1]]}},"alternative-id":["10.1002\/scj.4690160410"],"URL":"https:\/\/doi.org\/10.1002\/scj.4690160410","archive":["Portico"],"relation":{},"ISSN":["0882-1666","1520-684X"],"issn-type":[{"value":"0882-1666","type":"print"},{"value":"1520-684X","type":"electronic"}],"subject":[],"published":{"date-parts":[[1985,1]]}}}