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It is intended to correctly determine the cerebral blood flow in a successful manner. When a constant γ is determined in a relational expression of {Ka=γ×(1−exp(−Ke/γ))} provided that Ke represents an end-tidal air velocity constant and Ka represents an arterial blood velocity constant concerning a xenon CT examination, a K-S-calculating means determines a temporary calculated value λα of a brain/blood distribution coefficient λ from temporary calculated values Kaiα, Kaoα obtained by a Ke/Ka conversion means on the basis of an assumed value γα of the Ke/Ka conversion constant γ set by an assumed value-setting means. In this case, the assumed value-setting means varies the assumed value γα within a desired range. A γ value-establishing means establishes, as a true Ke/Ka conversion constant γ, the assumed value γα obtained when the temporary calculated value λα most closely approaches a target value λτ by comparing the temporary calculated value λα with the target value λτ from a target λ value-calculating means.
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