CN108076578B - X光成像中产生x光脉冲的方法、计算机程序产品和设备 - Google Patents
X光成像中产生x光脉冲的方法、计算机程序产品和设备 Download PDFInfo
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Abstract
本发明涉及用于在X光成像中产生X光脉冲的方法、计算机程序产品、计算机可读介质和装置。本发明说明了一种用于在X光成像中产生X光脉冲的方法,具有以下步骤:‑自动地关断X光管的高电压,‑由此管电压降低,和‑在关断高电压之后在达到管电压的可预给定的阈值或达到可预给定的等待时间时,自动接通布置在X光管的发射体和阳极之间的光栅的光栅电压,‑由此,没有电子能够从发射体到达阳极,并且管电流下降到零值。本发明也说明了用于在X光成像中产生X光脉冲的设备、附属的计算机程序产品和附属的计算机可读介质。本发明提供以下优点:能够将用于阻断管电流的两种已知变型方案的优点组合,也即,因此不仅能够切换高管电流、也能够防止低能量X射线。
Description
技术领域
本发明涉及用于在X光成像中产生X光脉冲的方法、计算机程序产品、计算机可读介质和设备。在此,X光管的高电压被关断并且在X光管的阳极和发射体之间的光栅被激活。
背景技术
在基于X光的成像中通常使用X光辐射器作为粒子源。经常,X光辐射器脉动,以便例如在医疗成像情况下将患者剂量保持得小。X光辐射器或者说X光管的构造根据现有技术在图1中示意性示出。
图1以横截面示出了X光辐射器。在真空管1中,通过将发射体2(=阴极)加热来将电子3释放到真空中。电子3通过施加在发射体2和阳极4之间的高电压被加速到阳极4上。在碰撞到阳极4上时,电子3的能量的大约1%被转换为X射线5,剩余的能量转化为热。所产生的热必须持续地从阳极4取走,否则面临在阳极4上的燃烧带的融化。因此在高功率管情况下,旋转阳极(Drehanoden)大多与直接冷却的轴承组合地使用。X射线5通过出口窗6离开真空管1。借助马达驱动装置7使旋转阳极4置于旋转。
对于血管造影术(Angiografie),例如需要脉动的X射线用于减少患者的X射线负荷。在X光管中的脉冲产生可以通过两种方法来实现。
最简单的情况是,将施加在发射体2和阳极4之间的高电压接通和关断(=初级脉动的X射线5)。代替地,可以在发射体2和阳极4之间布置光栅8,或者在发射体2周围布置金属体,对所述光栅或金属体施加脉冲反向电压,由此电子3被屏蔽至高电压区域。换句话说,光栅8被接通或关断,由此所述光栅8交替地截止和导通(=次级脉动的X射线5)。
第一种方法可以简单地被实现。然而,由于线缆等引起的高电容在操控中具有以下缺点:其放电必须经由X光管来进行。由此,具有较少能量的电子3也短时地碰到阳极4,也即,经受了较小的加速电压。但是,低能量电子仅仅产生低能量X射线,所述低能量X射线例如在医疗成像中引起不必要的高患者剂量,而不对成像作出贡献。
因为管电流在非常短的开关时间中可以被屏蔽,所以第二种方法实现了干净的在时间上受限的X光脉冲。在公开文献DE 10 2009 004 186 A1中示例性地公开了一种光栅装置。然而,在高功率X光管中管电流是非常高的。为了产生这样高的管电流,发射体2的大的发射面是有帮助的。但是,大的发射面很难被阻断。就此而言,在具有大电流的X光管中,次级脉动是困难的。
发明内容
本发明的任务是,说明用于在X光成像中产生X光脉冲的方法、计算机程序产品、计算机可读介质和设备,其避免上述缺点和限制并且使得能够在高功率X光管中产生脉动的X射线。
按照本发明,利用独立权利要求的方法、计算机程序产品、计算机可读介质和设备来解决所提任务。在从属权利中说明有利的改进方案。
按照本发明,将两种已知方法进行相互组合,使得即使在高的管电流情况下也能产生清楚分辨的X光脉冲。该流程如下:
a)首先关断X光管的高电压。该高电压在X光管中强电流情况下下降。
b)一旦管电压达到了阈值,所述光栅就被激活,在该阈值的情况下发射体可以通过光栅暂时(zeitlich)完全与高电压分离。所施加的高电压于是保持在该值上。
通过按照本发明将这两种方法组合,可以一方面使用高电流,另一方面防止在医疗成像中不期望的低能量射线。
本发明请求保护一种用于在X光成像中产生X光脉冲的方法,其具有下面的步骤:
-自动地关断X光管的高电压,
-由此管电压降低,和
-在关断高电压之后在达到管电压的可预给定的阈值或达到可预给定的等待时间时,自动接通布置在X光管的发射体和阳极之间的光栅的光栅电压,
-由此,没有电子能够从发射体到达阳极,并且管电流下降到零值。
本发明提供以下优点:用于截止管电流的已知变型方案的优点能够被组合,也即因此不仅能够切换高管电流也能够防止低能量X射线。
在一种改进方案中选择阈值或等待时间,使得发射体能够通过光栅完全地与高电压分离。
在另一实施方式中,阈值或者等待时间可以通过实验方式或计算方式来确定。
本发明还请求保护一种计算机程序产品,包括计算机程序,其中计算机程序可以被加载到控制单元的存储器装置中,其中当计算机程序在控制单元上被实施时,利用该计算机程序来实施按照本发明方法的步骤。
本发明也请求保护一种计算机可读介质,在该计算机可读介质上存储有计算机程序,其中该计算机程序可加载到控制单元的存储器装置中,其中当计算机程序在控制单元上被实施时,利用该计算机程序来实施按照本发明方法的步骤。
此外,本发明还请求保护一种用于在X光成像时产生X光脉冲的设备,其具有:
-带有发射体和阳极的X光管,
–高电压产生单元,其被构造用于在发射体和阳极之间建立高电压,
–在发射体和阳极之间的光栅,其被构造用于在施加光栅电压时对发射体的电子进行偏转,
–光栅电压产生单元,其被构造用于建立光栅电压,和
–控制单元,其被构造和设立用于:自动关断高电压供电单元的高电压,并且在关断高电压之后在达到管电压的可预给定的阈值时或者达到可预给定的等待时间时自动接通光栅电压产生单元的光栅电压。
在一种改进方案中,该设备具有与控制单元电连接的管电压测量单元,所述管电压测量单元被构造用于确定X光管的管电压并且将其传输给控制单元。
附图说明
本发明的另外的特点和优点从实施例的下面的阐述根据示意图变得显而易见。
其中:
图1以横截面示出X光管,
图2示出在初级脉动的X射线的情况下的管电压变化曲线,
图3示出在次级脉动的X射线的情况下的管电压变化曲线,
图4示出按照本发明的方法的流程图,
图5示出按照本发明的管电压变化曲线,和
图6示出用于产生X光脉冲的设备的框图。
具体实施方式
图2以简图示出了针对初级脉动的X射线的、以kV为单位的管电压UT根据以ms为单元的时间t的变化曲线。在脉冲持续时间PT之后,关断高电压并且管电压在些许时间之后降落到零值。
图3以简图示出了针对次级脉动的X射线的、以kV为单位的管电压UT根据以ms为单元的时间t的变化曲线。在脉冲持续时间PT之后,接通光栅电压并且管电流IT立刻降落到零值,因为现在没有另外的电子能够从发射体到达阳极。但是这仅仅是在管电流或管电压UT不是太大时才能实现,因为只有那时光栅才是完全有效的并且所有电子能够被阻断(sperren)。X光脉冲被干净地截断,如在图3中能够看出的一样。
图4示出了用于在X光成像时产生X光脉冲的、按照本发明的方法的流程图。在第一步骤101中,接通X光管的高电压。在下一个步骤102中,在过去了脉冲持续时间PT之后关断该高电压。在管电压UT已经达到阈值TH之后,在步骤103中激活光栅。管电流IT降落到零值。在暂停之后,在步骤104中将光栅8去活并且再次跳到步骤101。
如果使用按照本发明的方法,那么得到按照图5的简图。可以看到根据以ms为单位的时间t的、以A为单位的管电流IT。在脉冲持续时间PT之后关断高电压,并且当管电压UT已经达到阈值TH时,通过接通光栅电压来激活光栅并且管电流IT降到零值。因此,所得到的脉冲持续时间由脉冲持续时间PT和等待时间WT组成。由此,虽然也经历了大的管电流,但仅仅产生高能量子。
图6示出了用于在X光成像时产生X光脉冲的设备的框图。X光管14的发射体2利用加热电压产生单元13来加热。在发射体2和阳极4之间施加高电压产生单元9的高电压。光栅8由光栅电压产生单元10来供电。借助管电压测量单元12可以测量管电压UT。前述的组件由控制单元11来控制。
当前的管电压UT由管电压测量单元12提供给控制单元11。在达到管电压UT的前面确定的阈值TH时,经由控制单元11激活光栅8。代替地,可以在先前确定的等待时间WT之后激活光栅8。现在不再有管电流能够流动。X光脉冲被干净地截断。接着,光栅8被去活并且高电压又被接通。
虽然,本发明已经详细地通过实施例被进一步图解和说明,但是本发明不由所公开的示例限制,并且其他的变型方案可以由技术人员从中导出,而不离开本发明的保护范围。
附图标记列表
1 真空管
2 发射体
3电子束
4 阳极
5 X射线
6 出口窗
7 马达驱动装置
8 光栅
9 高电压产生单元
10 光栅电压产生单元
11 控制单元
12 管电压测量单元
13 加热电压产生单元
14 X光管
101 接通高电压
102 关断高电压
103 将光栅8激活
104 将光栅8去活
IT 管电流
PT 脉冲持续时间
TH 阈值
t 时间
UT 管电压
WT 等待时间
Claims (6)
1.一种用于在X光成像时产生X光脉冲的方法,所述方法具有以下步骤:
-自动地关断(102)X光管(14)的高电压,
-由此管电压(UT)降低,和
-在关断所述高电压之后在达到所述管电压(UT)的可预给定的阈值(TH)或达到可预给定的等待时间(WT)时,自动接通(103)布置在所述X光管(14)的发射体(2)和阳极(4)之间的光栅(8)的光栅电压,
-由此,没有电子(3)能够从所述发射体(2)到达所述阳极(4),并且管电流(IT)下降到零值。
2.按照权利要求1所述的方法,其特征在于,所述阈值(TH)或所述等待时间(WT)被选择为,使得所述发射体(2)能够通过所述光栅(8)暂时完全与所述高电压分离。
3.按照权利要求1或2所述的方法,其特征在于,所述阈值(TH)或者所述等待时间(WT)通过实验方式或计算方式确定。
4.一种计算机可读介质,在该计算机可读介质上存储有计算机程序,其中该计算机程序能够被加载到控制单元(11)的存储器装置中,其中当所述计算机程序在所述控制单元(11)上被实施时,利用该计算机程序来实施按照权利要求1或2之一所述方法的步骤。
5.一种用于在X光成像时产生X光脉冲的设备,所述设备具有:
-带有发射体(2)和阳极(4)的X光管(14),
–高电压产生单元(9),所述高电压产生单元被构造用于在所述发射体(2)和所述阳极(4)之间建立高电压,
–在所述发射体(2)和所述阳极(4)之间的光栅(8),所述光栅被构造用于在施加光栅电压时将所述发射体(2)的电子与所述阳极(4)阻断,
–光栅电压产生单元(10),所述光栅电压产生单元被构造用于建立光栅电压,和
–控制单元(11),所述控制单元被构造和设立用于:自动关断所述高电压产生单元(9)的所述高电压,并且在关断高电压之后在达到管电压(UT)的可预给定的阈值(TH)时或者达到可预给定的等待时间(WT)时,自动接通所述光栅电压产生单元(10)的所述光栅电压。
6.按照权利要求5所述的设备,其特征在于,
该设备具有与所述控制单元(11)电连接的管电压测量单元(12),所述管电压测量单元被构造用于确定所述X光管(14)的所述管电压(UT)并且将所述管电压传输给所述控制单元(11)。
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