CN1194815A - 计算机层析x射线摄影机 - Google Patents
计算机层析x射线摄影机 Download PDFInfo
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- CN1194815A CN1194815A CN 98104234 CN98104234A CN1194815A CN 1194815 A CN1194815 A CN 1194815A CN 98104234 CN98104234 CN 98104234 CN 98104234 A CN98104234 A CN 98104234A CN 1194815 A CN1194815 A CN 1194815A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4035—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating
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Abstract
一种计算机层析X射线摄影机,对其进行改进设计后,使之能以更简单的方式形成相应于不同光谱的数据。探测器由至少两个平行设置的探测器行(3a,3b)组成,投射到至少一个探测器行(3b)上的X射线束预先由一射束过滤器(13)来过滤。
Description
本发明涉及一种计算机层析X射线摄影机。
不同的组织,例如软组织或骨组织在受计算机层析X射线摄影机的X射线照射时,呈现不同的光谱吸收特性。为了在总体衰减的基础上,获得更多关于受照射物的信息,可充分利用上述特性。
本发明的目的在于设计一种带有一X射线源并具有多色光谱的计算机层析X射线摄影机,使得其中的探测器提供光谱方面的信息。
本发明的目的是通过这样一种计算机层析X射线摄影机来实现的,它具有一个由一X射线源和一探测器组成的测量装置,该探测器接收由X射线源发射出的穿过测量场的X射线束,其中设有一用于遮挡X射线束的初级射线光阑,该探测器由至少两个平行的探测器行组成,其中的每个探测器行由一列探测器元件组成,其中投射到至少一个探测器行上的X射线束通过一射束过滤器被过滤。
在本发明的计算机层析X射线摄影机中,探测器具有至少两列相互平行的且分别由一列探测元件构成的探测行。在此,其中一列探测行相对另一列探测行有不同的光谱权重,因为在其照射通道上有一个设置在初级射线光阑区域的射束过滤器。
下面借助于附图所示实施例对本发明作进一步的详细说明,附图中:
图1所示为用于阐述本发明构思的计算机层析X射线摄影机的主要部件;
图2为图1所示本发明计算机层析X射线摄影机的主要部件沿箭头II方向的视图。
图1所示计算机层析X射线摄影机具有一个由一X射线源1和一探测器3构成的测量单元,该X射线源发射一扇形X射线束2,探测器3由一列,例如512个单个探测器组成。焦点用11表示。待检查的病人4躺在病榻5上,测量单元1,3绕病人4所在的测量场旋转360°,以对病人4进行扫描。旋转轴线用10来表示。在这种情况下,由X射线发生器6馈电的X射线源1以脉冲形式或持续照射形式工作。测量单元1,3处于预定角度位置时,产生数据组,这些数据由探测器3输送给一计算机7,计算机由产生的数据组计算出预定像点的衰减系数并在一显示设备8上示出。在显示设备8上相应地示出病人的透射层的图像。
图2示出病人4的透射层的厚度由一初级射线光阑12来确定,该光阑对X射线束2作相应遮挡并设置在焦点11附近。探测器3由两列平行的分别由一列探测元件构成的探测器行3a,3b组成,X射线束2投射在探测器行3b上的部分通过一位于焦点附近的射束过滤器13被预先过滤。因此,探测器行3a,3b的数据表示两个不相关的数据组,用通常的算法可重现一CT图,这两个数据组包含不同的,计算出的光谱吸收值,这两个数据组相互结合,包含了病人4中的元素组成(Elementzusammense tzung)的附加信息。这些信息能够显示在图像中。
一般也可想象,设置多于两个的并具有相应多的射束过滤器的探测器行。在一个多层系统中,可以用同一光谱分别对每一整组探测器行进行照射。
在产生一宏观摄影(低倍照像)图片时,测量装置1、3被锁定停止转动,在测量装置1、3和病榻5之间产生一沿系统轴线10方向的相对运动,可同时用不同的光谱进行两次或多次投影测量,并按上述方法显示出来。
Claims (2)
1.一种计算机层析X射线摄影机,其具有一个由一X射线源(1)和一探测器(3)组成的测量装置,该探测器接收由X射线源(1)发射出的穿过测量场(9)的X射线束(2),其中设有一用于遮挡X射线束(2)的初级射线光阑(12),该探测器(3)由至少两个平行的探测器行(3a,3b)组成,其中的每个探测器行由一列探测器元件组成,其中投射到至少一个探测器行(3b)上的X射线束通过一射束过滤器被过滤。
2.如权利要求1所述的计算机层析X射线摄影机,其中,所述射束过滤器(13)设置在靠近初级射线光阑(12)之处。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997113400 DE19713400A1 (de) | 1997-04-01 | 1997-04-01 | Röntgen-Computertomograph |
DE19713400.9 | 1997-04-01 |
Publications (1)
Publication Number | Publication Date |
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CN1194815A true CN1194815A (zh) | 1998-10-07 |
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CN 98104234 Pending CN1194815A (zh) | 1997-04-01 | 1998-01-14 | 计算机层析x射线摄影机 |
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Country | Link |
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JP (1) | JPH10323348A (zh) |
CN (1) | CN1194815A (zh) |
DE (1) | DE19713400A1 (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE10048775B4 (de) | 2000-09-29 | 2006-02-02 | Siemens Ag | Röntgen-Computertomographieeinrichtung |
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CA1136776A (en) * | 1979-03-23 | 1982-11-30 | Brian K. Rutt | Split filter ct |
DE4209376A1 (de) * | 1992-03-23 | 1993-09-30 | Siemens Ag | Flächerstrahl-Computertomograph |
-
1997
- 1997-04-01 DE DE1997113400 patent/DE19713400A1/de not_active Ceased
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1998
- 1998-01-14 CN CN 98104234 patent/CN1194815A/zh active Pending
- 1998-03-31 JP JP10086432A patent/JPH10323348A/ja not_active Withdrawn
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DE19713400A1 (de) | 1998-10-15 |
JPH10323348A (ja) | 1998-12-08 |
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