公开(公告)号：EP0107451B1

公开(公告)日：1989-05-24

申请号：EP83306222.7

申请日：1983-10-13

Applicant: IMATRON INC.

Inventor： Rand, Roy Edward

IPC: H01J35/00 ,  H01J3/40

CPC classification number: H01J35/00

公开(公告)号：EP0117729A2

公开(公告)日：1984-09-05

申请号：EP84301181.8

申请日：1984-02-23

Applicant: IMATRON INC.

Inventor： Rand, Roy Edward

IPC: H01J35/00 ,  H01J35/14 ,  A61B6/02

CPC classification number: H01J35/00 ,  H01J35/14

Abstract: An electron beam production and control assembly especially suitable for use in producing X-rays in a computed tomography X-ray scanning system is disclosed herein. In this system, an electron beam is ultimately directed onto an X-ray producing target in a converging manner using electromagnetic components to accomplish this. The system also includes an arrangement for neutralizing the converging beam in a controlled manner sufficientto cause itto converge to a greater extent than it otherwise would in the absence of controlled neutralization, whereby to provide ion aided focusing.

Abstract translation: 电子束的生产和控制组件的爱特别适用于在计算机断层摄影的X射线扫描系统中产生X射线的使用光盘游离缺失。 在该系统中，电子束是利用电磁元件来完成这个最终引导到X射线靶生产以会聚方式。 因此，该系统包括：在用于在充以受控的方式，以使其收敛到更大的程度比其否则将在不存在控制中和，由此提供离子辅助聚焦中和会聚光束布置。

公开(公告)号：EP0127983A3

公开(公告)日：1986-09-17

申请号：EP84303494

申请日：1984-05-23

Applicant: IMATRON INC.

Inventor： Rand, Roy Edward

IPC: H01J35/14 ,  A61B06/02

CPC classification number: A61B6/032 ,  A61B6/4028 ,  H01J35/00 ,  H01J35/14

Abstract: A scanning electron beam computed tomography scanner includes means defining a vacuum chamber (16), means (21, 22) for producing a space-charge limited electron beam (24) at one location in the chamber (16) and for directing it to a second location therein, and an elongate target (26) of the type which produces X-rays as a result of the impingement thereon by the electron beam (24). The scanner also includes an arrangement (42) at the second location for causing the beam (24) to scan along the length of the target (26) so as to impinge on the latter at all points along its length in order to cause X-rays to be produced by and emanate from the target (26). This arrangement includes means, specifically differential focal strength electron beam optics, for reducing the convergence of the electron beam (24) in the radial plane, at any instant, while maintaining the position of the waist of the beam (24) in the scan plane at the location of the target (26), thus reducing the mutual repulsion of the electrons in the beam and decreasing the azimuthal width of the electron beam spot. This also decreases the azimuthal width of X-ray beam effective focal spot and thereby improvesthe resolution of the scanner. The increased radial size of the electron beam spot is compensated by orienting the target (26) relative to the electron beam (24) in a specific way so that the axial width of the X-ray effective focal spot is independently controlled.

Abstract translation: 扫描电子束计算机断层摄影扫描仪包括限定真空室（16）的装置，用于在腔室（16）中的一个位置处产生空间电荷受限电子束（24）的装置（21,22），并将其引导到 以及由于电子束（24）在其上撞击而产生X射线的细长靶（26）。 扫描仪还包括在第二位置处的装置（42），用于使光束（24）沿着靶（26）的长度扫描，以便沿其长度的所有点撞击光束（24），以便使X射线 由靶（26）产生并发射的光线。 这种布置包括特别是差分焦点强度电子束光学器件，用于在任何时刻减小电子束（24）在径向平面中的会聚，同时保持光束（24）的腰部在扫描平面中的位置 在目标（26）的位置处，因此减小了电子束中的电子的相互排斥并降低了电子束点的方位角宽度。 这也降低了X射线束有效焦点的方位角宽度，从而提高了扫描仪的分辨率。 通过以特定方式相对于电子束（24）定向靶（26）来补偿电子束点的径向尺寸的增加，使得X射线有效焦斑的轴向宽度被独立地控制。

公开(公告)号：EP0107451A3

公开(公告)日：1986-03-19

申请号：EP83306222

申请日：1983-10-13

Applicant: IMATRON INC.

Inventor： Rand, Roy Edward

IPC: H01J35/00 ,  H01J03/40

CPC classification number: H01J35/00

Abstract: An electron beam production and control assembly especially suitable for use in producing X-rays in a computed tomography (CT) X-ray scanning system is disclosed herein along with its method of operation. This assembly produces its electron beam within a vacuum-sealed housing chamber which is evacuated of internal gases, except inevitably for small amounts of residual gas. The electron beam is produced by suitable means within the chamber and directed along a path therethrough from the chamber's rearwardmost end to its forwardmost end whereby to impinge on a suitable target for producing the necessary X-rays. Since there is residual gas within the chamber, the electrons of the beam will interact with it and thereby produce positive ions which have the effect of neutralizing the space charge of the electron beam. However, there are a number of differentiel arrangements disclosed herein which form part of the overall assembly for acting on these ions and reducing the neutralizing effectthey would otherwise have on the beam.

公开(公告)号：EP0117729A3

公开(公告)日：1986-03-19

申请号：EP84301181

申请日：1984-02-23

Applicant: IMATRON INC.

Inventor： Rand, Roy Edward

IPC: H01J35/00 ,  H01J35/14 ,  A61B06/02

CPC classification number: H01J35/00 ,  H01J35/14

Abstract: An electron beam production and control assembly especially suitable for use in producing X-rays in a computed tomography X-ray scanning system is disclosed herein. In this system, an electron beam is ultimately directed onto an X-ray producing target in a converging manner using electromagnetic components to accomplish this. The system also includes an arrangement for neutralizing the converging beam in a controlled manner sufficientto cause itto converge to a greater extent than it otherwise would in the absence of controlled neutralization, whereby to provide ion aided focusing.

Abstract translation: 本文公开了一种特别适合于在计算机断层摄影X射线扫描系统中生产X射线的电子束产生和控制组件。 在该系统中，电子束最终以电磁成分以会聚的方式被引导到X射线产生目标上以实现这一点。 该系统还包括用于以受控的方式中和会聚束的装置，足以使其在不存在受控中和的情况下比其它方式会聚更大的程度，从而提供离子辅助聚焦。

公开(公告)号：EP0127983A2

公开(公告)日：1984-12-12

申请号：EP84303494.3

申请日：1984-05-23

Applicant: IMATRON INC.

Inventor： Rand, Roy Edward

IPC: H01J35/14 ,  A61B6/02

CPC classification number: A61B6/032 ,  A61B6/4028 ,  H01J35/00 ,  H01J35/14

Abstract: A scanning electron beam computed tomography scanner includes means defining a vacuum chamber (16), means (21, 22) for producing a space-charge limited electron beam (24) at one location in the chamber (16) and for directing it to a second location therein, and an elongate target (26) of the type which produces X-rays as a result of the impingement thereon by the electron beam (24). The scanner also includes an arrangement (42) at the second location for causing the beam (24) to scan along the length of the target (26) so as to impinge on the latter at all points along its length in order to cause X-rays to be produced by and emanate from the target (26). This arrangement includes means, specifically differential focal strength electron beam optics, for reducing the convergence of the electron beam (24) in the radial plane, at any instant, while maintaining the position of the waist of the beam (24) in the scan plane at the location of the target (26), thus reducing the mutual repulsion of the electrons in the beam and decreasing the azimuthal width of the electron beam spot. This also decreases the azimuthal width of X-ray beam effective focal spot and thereby improvesthe resolution of the scanner. The increased radial size of the electron beam spot is compensated by orienting the target (26) relative to the electron beam (24) in a specific way so that the axial width of the X-ray effective focal spot is independently controlled.

Abstract translation: 扫描电子束计算机断层摄影扫描仪包括限定真空室（16）的装置，用于在腔室（16）中的一个位置处产生空间电荷受限电子束（24）的装置（21,22），并将其引导到 以及由于电子束（24）在其上撞击而产生X射线的细长靶（26）。 扫描仪还包括在第二位置处的装置（42），用于使光束（24）沿着靶（26）的长度扫描，以便沿其长度的所有点撞击光束（24），以便使X射线 由靶（26）产生并发射的光线。 这种布置包括特别是差分焦点强度电子束光学器件，用于在任何时刻减小电子束（24）在径向平面中的会聚，同时保持光束（24）的腰部在扫描平面中的位置 在目标（26）的位置处，因此减小了电子束中的电子的相互排斥并降低了电子束点的方位角宽度。 这也降低了X射线束有效焦点的方位角宽度，从而提高了扫描仪的分辨率。 通过以特定方式相对于电子束（24）定向靶（26）来补偿电子束点的径向尺寸的增加，使得X射线有效焦斑的轴向宽度被独立地控制。

公开(公告)号：EP0107451A2

公开(公告)日：1984-05-02

申请号：EP83306222.7

申请日：1983-10-13

Applicant: IMATRON INC.

Inventor： Rand, Roy Edward

IPC: H01J35/00 ,  H01J3/40

CPC classification number: H01J35/00

Abstract: An electron beam production and control assembly especially suitable for use in producing X-rays in a computed tomography (CT) X-ray scanning system is disclosed herein along with its method of operation. This assembly produces its electron beam within a vacuum-sealed housing chamber which is evacuated of internal gases, except inevitably for small amounts of residual gas. The electron beam is produced by suitable means within the chamber and directed along a path therethrough from the chamber's rearwardmost end to its forwardmost end whereby to impinge on a suitable target for producing the necessary X-rays. Since there is residual gas within the chamber, the electrons of the beam will interact with it and thereby produce positive ions which have the effect of neutralizing the space charge of the electron beam. However, there are a number of differentiel arrangements disclosed herein which form part of the overall assembly for acting on these ions and reducing the neutralizing effectthey would otherwise have on the beam.