ABSORPTION COEFFICIENT IMAGE ESTIMATION METHOD, ABSORPTION COEFFICIENT IMAGE ESTIMATION PROGRAM, AND POSITRON CT DEVICE EQUIPPED WITH SAME

摘要

In this absorption coefficient image estimation method, an absorption coefficient value is corrected in step S8 (μ = μ'+α×μ_off) 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×μ_off obtained by multiplying an offset image μ_off by a factor α. Therefore, in the absorption coefficient image having the absorption coefficient value μ corrected by the step S8 (μ = μ'+α×μ_off), 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.