首页> 外国专利> 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

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

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
机译:它旨在以成功的方式正确确定脑血流量。如果在关系表达式äKa=γx(1- exp(-Ke / gamma))ü中确定了恒定伽玛,则前提条件是Ke表示潮气末的空气速度常数,Ka表示关于氙气CT的动脉血流速度常数检查时,KS计算装置(124)基于由Ke / Ka转换装置(112)获得的临时计算值Kai alpha,Kao alpha来确定大脑/血液分布系数λ的临时计算值lambda alpha。由假设值设定装置(114)设定的Ke / Ka转换常数γ的假设值γalpha。在这种情况下,假定值设定装置(114)在期望范围内改变假定值γ。伽马值建立装置(126)通过比较临时计算值λα,将当临时计算值λα最接近目标值λtau时获得的假定值γα建立为真实的Ke / Ka转换常数γ。来自目标λ值计算装置(122)的目标值λtau。 <图像>

著录项

  • 公开/公告号DE60014316D1

    专利类型

  • 公开/公告日2004-11-04

    原文格式PDF

  • 申请/专利权人 ANZAI MEDICAL K.K. TOKIO/TOKYO;

    申请/专利号DE2000614316T

  • 发明设计人 SASE SHIGERU;

    申请日2000-07-31

  • 分类号A61B6/00;A61B5/08;

  • 国家 DE

  • 入库时间 2022-08-21 22:41:28

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