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1. (WO2018220686) ABSORPTION COEFFICIENT IMAGE ESTIMATION METHOD, ABSORPTION COEFFICIENT IMAGE ESTIMATION PROGRAM, AND POSITRON CT DEVICE EQUIPPED WITH SAME

Pub. No.:    WO/2018/220686    International Application No.:    PCT/JP2017/019944
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Tue May 30 01:59:59 CEST 2017
IPC: G01T 1/161
Applicants: SHIMADZU CORPORATION
株式会社島津製作所
Inventors: KOBAYASHI Tetsuya
小林 哲哉
Title: ABSORPTION COEFFICIENT IMAGE ESTIMATION METHOD, ABSORPTION COEFFICIENT IMAGE ESTIMATION PROGRAM, AND POSITRON CT DEVICE EQUIPPED WITH SAME
Abstract:
In this absorption coefficient image estimation method, an absorption coefficient value is corrected in step S8 (μ = μ'+α×μoff) on the basis of a mathematical relationship in which the difference between a value of a non-quantitative image μ' in a region Ω and a known absorption coefficient value (a value of a true absorption coefficient image) can be approximated by α×μoff obtained by multiplying an offset image μoff by a factor α. Therefore, in the absorption coefficient image having the absorption coefficient value μ corrected by the step S8 (μ = μ'+α×μoff), a systematic error becomes small. As a result, a quantitative absorption coefficient image can be created, and accurate absorption correction of a radioactive image becomes possible.