Method for determining constant in relational expression concerning end-tidal air velocity constant and arterial blood velocity constant and xenon CT apparatus
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United States of America Patent
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Jan 8, 2002
Grant Date -
N/A
app pub date -
Aug 1, 2000
filing date -
Mar 30, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
It is intended to correctly determine the cerebral blood flow in a successful manner. When a constant .gamma. is determined in a relational expression of {Ka=.gamma..times.(1-exp(-Ke/.gamma.))} 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 .lambda..alpha. of a brain/blood distribution coefficient .lambda. from temporary calculated values Kai.alpha., Kao.alpha. obtained by a Ke/Ka conversion means on the basis of an assumed value .gamma..alpha. of the Ke/Ka conversion constant .gamma. set by an assumed value-setting means. In this case, the assumed value-setting means varies the assumed value .gamma..alpha. within a desired range. A .gamma. value-establishing means establishes, as a true Ke/Ka conversion constant .gamma., the assumed value .gamma..alpha. obtained when the temporary calculated value .lambda..alpha. most closely approaches a target value .lambda..tau. by comparing the temporary calculated value .lambda..alpha. with the target value .lambda..tau. from a target .lambda. value-calculating means.
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