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method for determining a constant in a relationausdruck on endexpiratorischer luftgeschwindigkeitskonstante and arterial blutgeschwindigkeitskonstante and xenon ct device
method for determining a constant in a relationausdruck on endexpiratorischer luftgeschwindigkeitskonstante and arterial blutgeschwindigkeitskonstante and xenon ct device
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机译:呼气末风速常数与动脉血流速度常数及氙ct装置的关系式中的常数的确定方法
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摘要
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 äKa = gamma x (1 - exp(-Ke/ gamma ))ü 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 (124) 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 (112) on the basis of an assumed value gamma alpha of the Ke/Ka conversion constant gamma set by an assumed value-setting means (114). In this case, the assumed value-setting means (114) varies the assumed value gamma alpha within a desired range. A gamma value-establishing means (126) 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 (122). IMAGE
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