{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,23]],"date-time":"2023-10-23T06:41:24Z","timestamp":1698043284807},"reference-count":13,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2007,3,22]],"date-time":"2007-03-22T00:00:00Z","timestamp":1174521600000},"content-version":"vor","delay-in-days":5924,"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":[[1991,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>It is expected in magnetic resonance imaging (MRI) that the measurement of the longitudinal relaxation time (<jats:italic>T<\/jats:italic><jats:sub>1<\/jats:sub>) will be useful in the diagnosis of cancer and in the tissue characterization. The present problem in this regard is the deterioration of the accuracy due to the various factors such as the rotation angle error of 180 deg pulse and the finite repetition time for imaging.<\/jats:p><jats:p>From such a viewpcint, this paper derived an expression for the signal intensity for the inversion recovery image (IR image) considering those factors, and it is shown that a highly accurate <jats:italic>T<\/jats:italic><jats:sub>1<\/jats:sub> image with small error can be constructed by the proposed method from at least three images with different inversion times. Then a simplified method is proposed which can derive analytically the <jats:italic>T<\/jats:italic><jats:sub>1<\/jats:sub> image from three IR images obtained without using the iterative calculation, by controlling the inversion times so that they form an arithmetic progression. It was verified by a computer simulation that the error in the <jats:italic>T<\/jats:italic><jats:sub>1<\/jats:sub> image due to the forementioned factors can be kept below 1 percent by the proposed method. Using the MRI system, the <jats:italic>T<\/jats:italic><jats:sub>1<\/jats:sub> image as well as the proton density (rH) image are obtained from a copper\u2010sulfate phantom. The error between the object and the reconstructed image, which has been as large as 7 to 15 percent, is now suppressed to approximately 1 percent by the proposed method. Thus, the accuracy improvement in <jats:italic>T<\/jats:italic><jats:sub>1<\/jats:sub> and rH images is verified.<\/jats:p>","DOI":"10.1002\/scj.4690220507","type":"journal-article","created":{"date-parts":[[2007,7,7]],"date-time":"2007-07-07T20:51:34Z","timestamp":1183841494000},"page":"60-69","source":"Crossref","is-referenced-by-count":0,"title":["High\u2010precision t<sub>1<\/sub> imaging method for magnetic resonance imaging"],"prefix":"10.1002","volume":"22","author":[{"given":"Shinichi","family":"Satou","sequence":"first","affiliation":[]},{"given":"Koichi","family":"Sano","sequence":"additional","affiliation":[]},{"given":"Tetsuo","family":"Yokoyama","sequence":"additional","affiliation":[]},{"given":"Hideaki","family":"Koizumi","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2007,3,22]]},"reference":[{"issue":"1","key":"e_1_2_1_2_2","first-page":"17","volume":"1","year":"1984","journal-title":"Jap. Soc. NMR Med. 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Proc. SMRM 4th Annual Meeting p.15(1985)."},{"issue":"23","key":"e_1_2_1_9_2","first-page":"1173","article-title":"Pulse sequence and measured information in NMR imaging","volume":"15","author":"Inoue T.","year":"1983","journal-title":"Image Inf."},{"key":"e_1_2_1_10_2","unstructured":"GiovanniBorasi.Quantitative images in magnetic resonance. Proc. SMRM 4th Annual Meeting pp.26\u201327(1985)."},{"key":"e_1_2_1_11_2","unstructured":"T. E.Conturo.Low\u2010noise T1and T2images by three\u2010parameter fit to multidelay multi\u2010echo MRI data. Proc. SMRM 5th Annual Meeting pp.233\u2013234(1986)."},{"key":"e_1_2_1_12_2","unstructured":"M.O'Donnel.An automated system for NMR imaging I: Efficient pulse sequences for simultaneous T1\u2013 T2imaging. Proc. SMRM 4th Annual Meeting pp.90\u201391(1985)."},{"key":"e_1_2_1_13_2","unstructured":"T.Kadota.Expression for signal intensity and relaxation time in CPMG method. Abstract 7th Meeting Jap. Soc. NMR Med. p.68(1986)."},{"key":"e_1_2_1_14_2","unstructured":"S.Naruse.Clinical evaluation of synthetic MR images in intracranial diseases. Proc. SMRM 5th Annual Meeting pp.762\u2013763(1986)."}],"container-title":["Systems and Computers in Japan"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2Fscj.4690220507","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/scj.4690220507","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,23]],"date-time":"2023-10-23T01:34:45Z","timestamp":1698024885000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/scj.4690220507"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1991,1]]},"references-count":13,"journal-issue":{"issue":"5","published-print":{"date-parts":[[1991,1]]}},"alternative-id":["10.1002\/scj.4690220507"],"URL":"https:\/\/doi.org\/10.1002\/scj.4690220507","archive":["Portico"],"relation":{},"ISSN":["0882-1666","1520-684X"],"issn-type":[{"value":"0882-1666","type":"print"},{"value":"1520-684X","type":"electronic"}],"subject":[],"published":{"date-parts":[[1991,1]]}}}