公开(公告)号：US4810893A

公开(公告)日：1989-03-07

申请号：US843134

申请日：1986-03-24

Applicant: Harm Meertens

Inventor： Harm Meertens

IPC: A61N5/10 ,  G01T1/29 ,  H01J47/02 ,  G01T1/185

CPC classification number: H01J47/028

Abstract: Image-detector for depicting differences in intensity in high energy photon beams with the aid of a photon-sensitive element, the photon-sensitive element is an ionization chamber, consisting in the main of two mainly equivalent plates of an electrically insulating material, which are attached to each other by a ring-shaped electrically insulating part as a divider, while the outer walls of both plates are covered with electrically conductive material, whereby one of the plates is equipped with a number of parallel high voltage electrodes over a central part of its inner wall and the other plate is equipped over a central part of its inner wall with a number of parallel ionization current electrodes which extend perpendicularly towards the high voltage electrodes, while the inner walls of both plates around the central parts are covered with an electrically conductive material and a liquid dieectric is situated in the space between the plates.

Abstract translation: 图像检测器借助于光子敏感元件来描绘高能量光子束的强度差异，该光子敏感元件是电离室，主要由电绝缘材料的两个主要相当的板组成，它们是 通过环形电绝缘部分作为分隔件彼此附接，同时两个板的外壁被导电材料覆盖，由此其中的一个板在中心部分上方配备有多个平行的高压电极 其内壁和另一个板被安装在其内壁的中心部分上，并具有垂直于高压电极延伸的多个平行的电离电流电极，而围绕中心部分的两个板的内壁被电 导电材料和液体薄膜位于板之间的空间中。

公开(公告)号：US5019711A

公开(公告)日：1991-05-28

申请号：US326688

申请日：1989-03-21

Applicant: Larry E. Antonuk

Inventor： Larry E. Antonuk

IPC: H01J47/02

CPC classification number: H01J47/028

Abstract: A scanning, liquid ionization chamber IMAGER/DOSIMETER having a rectangular housing with a top of a thin predetermined thickness. An internal frame lies inside the rectangular housing and is welded thereto. Two planes of orthogonal wires are strung across the internal frame and immobilized thereby. These wires are electrically insulated from the rectangular housing and internal frame by non-conductive connectors. A first plane of wires serves a sensing function while the other plane of wires has a bias applied thereto one wire at a time. The rectangular housing is sealed after a liquid ionization medium completely fills any open space contained inside the rectangular housing. Non-conductive feed through wiring means are connected to the planes of wires. The first and second planes of wires are suspended in free space inside the rectangular housing. The liquid ionization medium is of a purity so as to extend electron lifetime; thus when a radiation beam causes electrons in the ionization medium these free electrons are swept away by the electric field of the applied bias and are output as a detected signal.

Abstract translation: 扫描液体电离室IMAGER / DOSIMETER具有具有薄的预定厚度的顶部的矩形壳体。 内部框架位于矩形壳体的内部并且被焊接在其上。 正交线的两个平面横跨内部框架并由此固定。 这些电线通过非导电连接器与矩形外壳和内部框架电绝缘。 线的第一平面用于感测功能，而另一个导线平面一次施加一根线。 在液体离子化介质完全填充容纳在矩形壳体内的任何开放空间之后，矩形壳体被密封。 通过布线装置的非导电馈电连接到电线平面。 电线的第一和第二平面悬挂在矩形外壳内的自由空间中。 液体离子化介质具有纯度，以延长电子寿命; 因此当辐射束在电离介质中引起电子时，这些自由电子被施加偏压的电场扫过，并作为检测信号输出。

公开(公告)号：US5631470A

公开(公告)日：1997-05-20

申请号：US649888

申请日：1996-05-13

Applicant: Derek J. Day ,  Reza Majidi-Ahy ,  Willi Fencl ,  Heinrich Riem ,  Salvatore Provencale ,  Rolf Staehelin

Inventor： Derek J. Day ,  Reza Majidi-Ahy ,  Willi Fencl ,  Heinrich Riem ,  Salvatore Provencale ,  Rolf Staehelin

IPC: G01T1/00 ,  G01T1/18 ,  G01T1/185 ,  H01J47/02

CPC classification number: H01J47/028 ,  G01T1/185

Abstract: The present invention provides electrode assemblies for LIC imagers that maximize ion collection and the electric field for the minimum bias voltage. To achieve this optimization the ion collection is confined to small regions. Due to this limited ion collection region, high neutralization efficiencies and fast sweep-out times can be obtained. Furthermore, with an electrode separation of approximately 0.1 millimeters, pulse voltages of less than 100 volts can be used. Low voltages result in improved reliability, longer system life, and lower safety risks.

Abstract translation: 本发明提供用于LIC成像器的电极组件，其最大化离子收集和用于最小偏置电压的电场。 为了实现这个优化，离子收集被限制在小的区域。 由于这种有限的离子收集区域，可以获得高的中和效率和快速的扫除时间。 此外，当电极间隔约为0.1毫米时，可以使用小于100伏特的脉冲电压。 低电压可以提高可靠性，延长系统寿命，降低安全隐患。

公开(公告)号：US4719354A

公开(公告)日：1988-01-12

申请号：US839481

申请日：1986-03-14

Applicant: Nathan R. Whetten

Inventor： Nathan R. Whetten

IPC: A61B6/03 ,  G01T1/185 ,  G01T1/29 ,  H01J47/02 ,  G01T1/18

CPC classification number: G01T1/2935 ,  H01J47/028

Abstract: An x-ray detector for use in computerized tomography employing a liquefied xenon as a high density detecting medium comprises a housing having an x-ray permeable window and containing at least one electrically conductive voltage plate spaced from, and parallel to, at least one collector plate comprising a plurality of conductive elements. The liquid xenon fills the space between the voltage and collector plates.

公开(公告)号：US5594252A

公开(公告)日：1997-01-14

申请号：US555815

申请日：1995-11-09

Applicant: Derek J. Day ,  Rolf Stahelin ,  Salvatore Provenzale ,  Heinrich Riem ,  Willi Fencl

Inventor： Derek J. Day ,  Rolf Stahelin ,  Salvatore Provenzale ,  Heinrich Riem ,  Willi Fencl

IPC: G01T1/185 ,  A61B6/00 ,  H01J47/02

CPC classification number: H01J47/028

Abstract: A three terminal ionization chamber includes a first electrode coupled to a bias voltage source spaced apart from a second electrode coupled to ground. A third terminal is provided which is positioned between the first and second electrodes. Measurement circuitry may be coupled to the third terminal to measure charge indicative of the amount of radiation incident to the chamber.

Abstract translation: 三端电离室包括耦合到与耦合到地的第二电极间隔开的偏置电压源的第一电极。 提供位于第一和第二电极之间的第三端子。 测量电路可以耦合到第三端子以测量指示入射到室的辐射量的电荷。

公开(公告)号：US5025376A

公开(公告)日：1991-06-18

申请号：US251529

申请日：1988-09-30

Applicant: Frank J. Bova ,  Lawrence T. Fitzgerald ,  Walter Mauderli

Inventor： Frank J. Bova ,  Lawrence T. Fitzgerald ,  Walter Mauderli

IPC: A61N5/10 ,  G01T1/185 ,  H01J47/02

CPC classification number: A61N5/1048 ,  G01T1/185 ,  H01J47/028

Abstract: An apparatus and method are provided for imaging an object undergoing high energy irradiation, such as a patient being treated by radiation teletherapy, the apparatus employing an array of ion chambers in a detector, the detector being rotatable with respect to the object, the image being obtained by acquiring projection data from each of the ion chambers at a sequence of predetermined orientations, the projection data for each location being reconstructed into an image by convolution filtering or other reconstruction technique, and subsequently employed in a back-projection of all projection data, which may then be displayed on a video monitor. The detector employs a liquid fluorocarbon as the ionizing medium in the plurality of ion chambers.

Abstract translation: 提供了一种装置和方法，用于对经历高能量照射的物体进行成像，例如通过辐射远程治疗进行治疗的患者，所述装置在检测器中采用离子室阵列，所述检测器可相对于物体旋转，所述图像为 通过以预定方向的顺序从每个离子室获取投影数据获得，通过卷积滤波或其他重建技术将每个位置的投影数据重建为图像，并随后用于所有投影数据的反投影， 然后可以将其显示在视频监视器上。 检测器采用液体碳氟化合物作为多个离子室中的电离介质。

公开(公告)号：US4733085A

公开(公告)日：1988-03-22

申请号：US880628

申请日：1986-07-01

Applicant: David F. Anderson

Inventor： David F. Anderson

IPC: G01T1/12 ,  G01T1/204 ,  G01T1/29 ,  H01J47/02 ,  G01T1/185

CPC classification number: H01J47/028 ,  G01T1/12 ,  G01T1/204 ,  G01T1/2935

Abstract: In an ionization type detector for high energy radiation wherein the energy of incident radiation is absorbed through the ionization of a liquid noble gas and resulting free charge is collected to form a signal indicative of the energy of the incident radiation, an improvement comprising doping the liquid noble gas with photosensitive molecules to convert scintillation light due to recombination of ions, to additional free charge.

Abstract translation: 在用于高能量辐射的电离型检测器中，其中通过液体惰性气体的电离吸收入射辐射的能量，并且收集所产生的游离电荷以形成指示入射辐射能量的信号，其改进包括掺杂液体 具有光敏分子的惰性气体由于离子的复合而转换闪烁光，进而增加了自由电荷。