公开(公告)号：US5442673A

公开(公告)日：1995-08-15

申请号：US220076

申请日：1994-03-30

Applicant: Roy E. Rand ,  Patrick B. Halahan

Inventor： Roy E. Rand ,  Patrick B. Halahan

IPC: A61B6/03 ,  A61B6/02

CPC classification number: A61B6/4028 ,  A61B6/032

Abstract: An x-ray collimator is described which is useful in an electron beam (EB) computed tomography (CT) scanner of the type in which a rotating electron beam is directed to impinge upon a ring-shaped target and the x-rays generated in response thereto are directed to a ring shaped detector array spaced therefrom. The collimator consists of an x-ray blocking septum having an aperture therein, the septum being located in a fixed position substantially co-planer with the planes of the target and the detector, so as to block all x-rays directed from said target to said detector except those which pass through said aperture. Tomographic slice width is determined by the "view" from the spot where the electron beam impinges upon the target, through the aperture, to the detector, and is variable by adjusting the position where the electron beam impinges upon the width of the x-ray target, and in a preferred embodiment, the position of a movable ring. In the preferred embodiment, a movable ring is provide which has a longitudinal axis positioned coaxial with the axis of the aperture and an end face opposed to and parallel with the septum. As well as forming part of the collimator, this ring acts as a pre-collimation radiation shield. This ring is moved concurrently when moving the position where the electron beam impinges upon the width of the x-ray target when the tomographic slice width is varied, by adjusting the spacing between the end face of the moveable ring and the septum.

Abstract translation: 描述了一种在电子束（EB）计算机断层摄影（CT）扫描器中有用的X射线准直仪，其中旋转电子束被引导撞击环形目标，并且响应中产生的x射线 其指向与其间隔开的环形检测器阵列。 准直器由在其中具有孔的x射线阻挡隔膜组成，隔膜位于与目标和检测器的平面基本上共同平面的固定位置，以便阻挡从所述目标指向的所有X射线 所述检测器除了通过所述孔的那些。 断层切片宽度由电子束通过孔径撞击到检测器的点处的“视图”确定，并且可以通过调节电子束在x射线的宽度上照射的位置而变化 目标，并且在优选实施例中，可移动环的位置。 在优选实施例中，提供可移动环，其具有与孔的轴线同轴的纵向轴线和与隔膜相对并平行的端面。 除了形成准直器的一部分之外，该环还用作预准直辐射屏蔽。 当通过调节活动环的端面与隔膜之间的间隔来改变断层切片宽度变化时，当移动电子束照射在x射线靶的宽度上的位置时，该环同时移动。

公开(公告)号：US07020232B2

公开(公告)日：2006-03-28

申请号：US10371467

申请日：2003-02-21

Applicant: Roy E. Rand ,  Jonathan Harman ,  Douglas P. Boyd

Inventor： Roy E. Rand ,  Jonathan Harman ,  Douglas P. Boyd

IPC: H05G1/60

CPC classification number: A61B6/032 ,  A61B6/027 ,  A61B6/4028 ,  A61B6/4085 ,  G01N23/046 ,  G01N2223/419 ,  G01N2223/612 ,  G06T11/005 ,  G06T2211/428 ,  G21K1/06

Abstract: A scanning electron beam computed tomographic system eliminates axial offset between target and detector by disposing the target, collimator, and detector such that active portions of the target and detector are always diametrically opposite each other. This result is achieved by providing a helical target, collimator, and detector, or by providing planar target, collimator, and detector components that are inclined relative to the vertical axis such that active portions of the target and detector are always diametrically opposite each other. Either configuration eliminates cone beam error and the necessity to correct for same. Further, the system can provide multi-slice scanning of an object that is in constant motion at a critical velocity, without having to interpolate data. Conventional helical scanning may still be undertaken. Detector elements can be disposed axially to improve signal/noise ratio and to produce a cone beam cancellation effect.

Abstract translation: 扫描电子束计算机断层摄影系统通过设置目标，准直仪和检测器来消除目标和检测器之间的轴向偏移，使得目标和检测器的有效部分总是沿径向相反。 该结果通过提供螺旋靶，准直器和检测器，或者通过提供相对于垂直轴线倾斜的平面靶，准直器和检测器部件来实现，使得靶和检测器的有效部分总是沿直径相对。 任何一种配置都可以消除锥形光束误差，同时也需要进行校正。 此外，该系统可以以临界速度提供恒定运动的物体的多层扫描，而无需内插数据。 传统的螺旋扫描可能仍然可以进行。 检测器元件可以轴向布置以改善信号/噪声比并产生锥形束消除效果。

公开(公告)号：US06792077B2

公开(公告)日：2004-09-14

申请号：US10064182

申请日：2002-06-19

Applicant: Roy E. Rand

Inventor： Roy E. Rand

IPC: G21K102

CPC classification number: A61B6/4028 ,  A61B6/032 ,  A61B6/06 ,  A61B6/4085 ,  G21K1/025

Abstract: An electron beam tomography (EBT) scanning system comprising an electron source generating an electron beam, a target ring that receives the electron beam and emits an x-ray fan beam upon impingement of the electron beam on the target ring, a pair of detector arrays arranged opposite the target ring, and a collimator arranged concentrically between the target ring and the pair of detector arrays. The collimator has interior and exterior walls concentrically arranged with one another and surrounding a patient examination area. The interior and exterior walls have a first set of apertures aligned to collimate the x-ray fan beam into a first collimated beam having a first width and a second collimated beam having a second width. Each collimated beam may form a single or double tomographic slice. The collimated beams are detected by the pair of detector arrays.

Abstract translation: 包括产生电子束的电子源的电子束层析成像（EBT）扫描系统，接收电子束并在电子束撞击目标环时发射X射线扇形束的目标环，一对检测器阵列 与目标环相对设置的准直器和同心地布置在目标环和该对检测器阵列之间的准直器。 准直器具有彼此同心地布置并且围绕患者检查区域的内部和外部壁。 内壁和外壁具有第一组孔，其对准以将X射线扇形光束准直成具有第一宽度的第一准直光束和具有第二宽度的第二准直光束。 每个准直光束可以形成单层或双层断层切片。 准直光束由一对检测器阵列检测。

公开(公告)号：US6160869A

公开(公告)日：2000-12-12

申请号：US165244

申请日：1998-10-01

Applicant: Geordie Zapalac ,  Roy E. Rand

Inventor： Geordie Zapalac ,  Roy E. Rand

IPC: H01J35/14 ,  H01J35/30

CPC classification number: H01J35/30 ,  H01J35/14

Abstract: Tuning, integrating, and operating an electron beam CT scanning system is simplified by using the fringe field from dipole magnets arranged as a chicane to focus the electron beam, thus replacing conventional quadrupole and solenoid coils. Preferably four "chicane" dipole magnets are series-coupled with the windings in the downstream deflection magnet, such that the chicane magnet X and Y coils are energized 90.degree. out of phase with the deflection magnet coils. The alternating current polarity in the chicane magnets creates an "S"-shaped electron beam trajectory that adequately uniformly focuses over the full cross-section of the electron beam. Winding the coils with a cosine distribution permits rotating the magnetic fields to change the azimuthal and deflecting planes of the electron beam, without disturbing the deflection angle and focusing properties. Chicane electrical current directions and magnet positions are such that the electron beam enters and exists the chicane on the axis of the scanning electron beam CT system. A new type of deflecting magnet is provided that has no end windings, and may be used in other beam optical systems.

Abstract translation: 通过使用布置为拐角的偶极磁体的边缘场来聚焦电子束，从而简化了电子束CT扫描系统的调谐，积分和操作，从而取代了传统的四极和螺线管线圈。 优选地，四个“拐角”偶极子磁体与下游偏转磁体中的绕组串联耦合，使得拐角磁体X和Y线圈与偏转磁体线圈相位90°异相。 拐角磁体中的交流极性产生了一个“S”形的电子束轨迹，足以使电子束的整个横截面均匀地聚焦。 用余弦分布卷绕线圈允许旋转磁场以改变电子束的方位角和偏转平面，而不会干扰偏转角和聚焦性质。 奇烷电流方向和磁体位置使得电子束在扫描电子束CT系统的轴线上进入并存在拐角。 提供了一种新型的偏转磁体，其不具有端部绕组，并且可用于其它光束光学系统。