公开(公告)号：US20150139386A1

公开(公告)日：2015-05-21

申请号：US14081814

申请日：2013-11-15

申请人： Varian Medical Systems, Inc.

发明人： Josh STAR-LACK ,  Timothy R. Fox ,  Daniel Shedlock ,  Richard E. Colbeth ,  Gary Virshup ,  James E. Clayton ,  David T. Nisius

IPC分类号： G01V5/00

CPC分类号： G01V5/0016 ,  G01N23/02 ,  G01N23/06 ,  G01V5/0041 ,  H01J35/101

摘要： Methods and systems for scanning objects comprising scanning a portion of an object by a first radiation beam having a first value of a beam characteristic, such as the dose, and detecting the first radiation beam after interaction with the object by a first detector. It is determined whether to change the first value to a second value based, at least in part, on the detected first radiation beam. That portion of the object is then scanned by a second radiation beam having the first value or the second value based on the determination. The second radiation is detected after interacting with the object by a second detector. The second detector may have a second resolution greater than a first resolution of the first detector. The first and second radiation beams may be formed by first and second slots angled with respect to each other.

摘要翻译： 用于扫描对象的方法和系统，包括通过具有诸如剂量的光束特性的第一值的第一辐射束来扫描物体的一部分，以及在通过第一检测器与物体相互作用之后检测第一辐射束。 至少部分地基于检测到的第一辐射束来确定是否将第一值改变为第二值。 然后基于该确定，通过具有第一值或第二值的第二辐射束来扫描物体的该部分。 通过第二检测器与物体相互作用后检测到第二辐射。 第二检测器可以具有大于第一检测器的第一分辨率的第二分辨率。 第一和第二辐射束可以由相对于彼此成角度的第一和第二槽形成。

公开(公告)号：US20140294147A1

公开(公告)日：2014-10-02

申请号：US14218699

申请日：2014-03-18

申请人： Varian Medical Systems, Inc.

发明人： Gongyin CHEN ,  Kevin Holt ,  Robert E. Drubka ,  John Stammetti ,  Michael Z. Duncan ,  Timothy R. Fox ,  David Nisius ,  Martin Hu

IPC分类号： G01V5/00

CPC分类号： G01V5/0016 ,  G01N23/04 ,  G01N23/046 ,  G01V5/0008 ,  G01V5/0025 ,  G01V5/0041 ,  G01V5/005 ,  G01V5/0066 ,  H05H7/22 ,  H05H9/00

摘要： Radiation scanning systems providing multiple views of an object in different planes and a reconstruction algorithm for reconstructing quasi-three-dimensional images from a limited number of views. A system may include bend magnets to direct accelerated charged particles to multiple targets in different viewing locations. Another system collimates radiation generated by a plurality of radiation sources into multiple beams for scanning an object at multiple angles. The object may be a cargo container, for example. The reconstruction algorithm uses an optimization algorithm and imaging and feasibility models to reconstruct quasi-three-dimensional images from the limited number of views.

摘要翻译： 提供不同平面中的物体的多个视图的辐射扫描系统和用于从有限数量的视图重建准三维图像的重建算法。 系统可以包括弯曲磁体，以将加速带电粒子引导到不同观察位置的多个目标。 另一个系统将由多个辐射源产生的辐射准直到多个光束以用于以多个角度扫描物体。 该物体可以是例如货物集装箱。 重建算法使用优化算法和成像和可行性模型从有限数量的视图重建准三维图像。

公开(公告)号：US09086496B2

公开(公告)日：2015-07-21

申请号：US14081814

申请日：2013-11-15

申请人： Varian Medical Systems, Inc.

发明人： Daniel Shedlock ,  Timothy R. Fox ,  Josh Star-Lack ,  Richard E. Colbeth ,  Gary Virshup ,  James E. Clayton ,  David T. Nisius

IPC分类号： G01V5/00 ,  G01N23/06 ,  H01J35/10 ,  G01N23/02

CPC分类号： G01V5/0016 ,  G01N23/02 ,  G01N23/06 ,  G01V5/0041 ,  H01J35/101

摘要： Methods and systems for scanning objects comprising scanning a portion of an object by a first radiation beam having a first value of a beam characteristic, such as the dose, and detecting the first radiation beam after interaction with the object by a first detector. It is determined whether to change the first value to a second value based, at least in part, on the detected first radiation beam. That portion of the object is then scanned by a second radiation beam having the first value or the second value based on the determination. The second radiation is detected after interacting with the object by a second detector. The second detector may have a second resolution greater than a first resolution of the first detector. The first and second radiation beams may be formed by first and second slots angled with respect to each other.

摘要翻译： 用于扫描对象的方法和系统，包括通过具有诸如剂量的光束特性的第一值的第一辐射束来扫描物体的一部分，以及在通过第一检测器与物体相互作用之后检测第一辐射束。 至少部分地基于检测到的第一辐射束来确定是否将第一值改变为第二值。 然后基于该确定，通过具有第一值或第二值的第二辐射束来扫描物体的该部分。 通过第二检测器与物体相互作用后检测到第二辐射。 第二检测器可以具有大于第一检测器的第一分辨率的第二分辨率。 第一和第二辐射束可以由相对于彼此成角度的第一和第二槽形成。

公开(公告)号：US20140265847A1

公开(公告)日：2014-09-18

申请号：US13831654

申请日：2013-03-15

申请人： VARIAN MEDICAL SYSTEMS, INC.

发明人： Timothy R. Fox

IPC分类号： H05B41/24

CPC分类号： H05H7/08 ,  H05H2007/084

摘要： A circuit to power an electron source includes a filament transformer comprising a primary side and a secondary side, a high-voltage transformer coupled to the filament transformer and the electron source, and an alternating current (AC) current limiter coupled in series with the primary side or the secondary side of the filament transformer. The AC current limiter includes a diode bridge and a current-limiting device in the diode bridge.

摘要翻译： 用于为电子源供电的电路包括一个包括初级侧和次级侧的灯丝变压器，耦合到灯丝变压器和电子源的高压变压器以及与主电源串联耦合的交流（AC）限流器 侧或次级侧的灯丝变压器。 交流限流器包括二极管桥和二极管桥中的限流器件。

公开(公告)号：US09635748B2

公开(公告)日：2017-04-25

申请号：US13848412

申请日：2013-03-21

申请人： Varian Medical Systems, Inc.

发明人： Timothy R. Fox

IPC分类号： H05G1/60 ,  G01N23/04 ,  A61B6/00

CPC分类号： H05G1/60 ,  A61B6/4225 ,  A61B6/4266 ,  G01N23/04

摘要： The present invention proposes a high speed radiographic system for use with megavolt linear-accelerator pulsed x-ray sources to produce video images of large-area fields. A linear accelerator is positioned above a field of view. X-ray photons are directed through an object of interest traveling and/or colliding within the field of view. A large area scintillator system, either truly continuous or in large continuous adjacent pieces, converts the x-ray photons that pass through the object into visible light, and an arrangement of cameras, focused at that plane, where each camera sees a sub-area of the entire scintillator, and these sub-areas overlap somewhat to cover the entire scintillator. The resulting images generated in each camera are synchronized to produce one contiguous, synchronized stream of images.

公开(公告)号：US09198276B2

公开(公告)日：2015-11-24

申请号：US13831654

申请日：2013-03-15

申请人： Varian Medical Systems, Inc.

发明人： Timothy R. Fox

IPC分类号： H05B41/16 ,  H05H7/08

CPC分类号： H05H7/08 ,  H05H2007/084

摘要： A circuit to power an electron source includes a filament transformer comprising a primary side and a secondary side, a high-voltage transformer coupled to the filament transformer and the electron source, and an alternating current (AC) current limiter coupled in series with the primary side or the secondary side of the filament transformer. The AC current limiter includes a diode bridge and a current-limiting device in the diode bridge.

摘要翻译： 用于为电子源供电的电路包括一个包括初级侧和次级侧的灯丝变压器，耦合到灯丝变压器和电子源的高压变压器以及与主电源串联耦合的交流（AC）限流器 侧或次级侧的灯丝变压器。 交流限流器包括二极管桥和二极管桥中的限流器件。