{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,22]],"date-time":"2023-10-22T21:11:23Z","timestamp":1698009083612},"reference-count":8,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2007,3,21]],"date-time":"2007-03-21T00:00:00Z","timestamp":1174435200000},"content-version":"vor","delay-in-days":7749,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Systems &amp;amp; Computers in Japan"],"published-print":{"date-parts":[[1986,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>One of the factors in the deterioration of the reconstructed image of the single\u2010photon emission CT (SPECT) is the respective characteristics of the collimator used in the detection of the \u03b3\u2010ray. The characteristics depend on the shape and material of the collimator, and produce shiftvariant blurs on the reconstructed image. This kind of error cannot be eliminated by the deconvolution, which regards the blur as shift\u2010invariant. This paper discusses the effect in the spatial frequency domain, and it is shown that the effect of the blur by collimator can be approximated analytically by a shift\u2010invariant blur on the annular ring determined for each frequency. A method of improving the quality of the reconstructed image is proposed utilizing this property. By the numerical simulation using a computer, it is verified that the proposed method is effective independently of the attenuation and quantization noise.<\/jats:p>","DOI":"10.1002\/scj.4690170406","type":"journal-article","created":{"date-parts":[[2007,7,7]],"date-time":"2007-07-07T11:22:44Z","timestamp":1183807364000},"page":"43-50","source":"Crossref","is-referenced-by-count":4,"title":["Correction method for collimator effect of ECT"],"prefix":"10.1002","volume":"17","author":[{"given":"Satoshi","family":"Iwata","sequence":"first","affiliation":[]},{"given":"Chiaki","family":"Yoshida","sequence":"additional","affiliation":[]},{"given":"Masato","family":"Nakajima","sequence":"additional","affiliation":[]},{"given":"Koichi","family":"Ogawa","sequence":"additional","affiliation":[]},{"given":"Shinichi","family":"Yuta","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2007,3,21]]},"reference":[{"key":"e_1_2_1_2_2","first-page":"3","article-title":"SPECT: SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY","volume":"27","author":"Iaszczak R. J.","year":"1980","journal-title":"I.E.E.E. Trans. Nucl. Sci."},{"issue":"9","key":"e_1_2_1_3_2","first-page":"1021","article-title":"Proposal on Infrared Rays Emission CT","volume":"67","author":"Uchiyama H.","year":"1984","journal-title":"Trans. (D), I.E.C.E., Japan"},{"key":"e_1_2_1_4_2","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1109\/TNS.1978.4329385","article-title":"A method for attenuation correction in radionuclide computed tomography","volume":"25","author":"Chang L. T.","year":"1978","journal-title":"I.E.E.E. Trans. Nucl. Sci."},{"key":"e_1_2_1_5_2","doi-asserted-by":"crossref","first-page":"2","DOI":"10.1109\/TNS.1979.4330536","article-title":"Attenuation correction and incomplete projection in single photon emission computed tomography","volume":"26","author":"Chang L. T.","year":"1979","journal-title":"I.E.E.E., Trans. Nucl. Sci."},{"key":"e_1_2_1_6_2","first-page":"10","article-title":"Attenuation correction method for single photon emission CT","volume":"67","author":"Morozumi T.","year":"1983","journal-title":"Trans. (D), I.E.C.E., Japan"},{"key":"e_1_2_1_7_2","first-page":"7","article-title":"Attenuation correction method using the ratio of two projections calculated without and with the attenuation for SPECT","volume":"67","author":"Morozumi T.","year":"1984","journal-title":"Trans. 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