METHODS AND APPARATUS FOR EXTENDED LOW CONTRAST DETECTABILITY FOR RADIOGRAPHIC IMAGING SYSTEMS

    公开(公告)号:US20170319169A1

    公开(公告)日:2017-11-09

    申请号:US15597787

    申请日:2017-05-17

    IPC分类号: A61B6/00 A61B6/03

    摘要: Evaluating dose performance of a radiographic imaging system with respect to image quality using a phantom, a channelized hotelling observer module as a model observer, and a printer, a plaque, or an electronic display includes scanning and producing images for a plurality of sections of the phantom using the radiographic imaging system, wherein the plurality of sections represent a range of patient sizes and doses and wherein the sections of the phantom contain objects of measurable detectability. Also included is analyzing the images to determine detectability results for one or more of the contained objects within the images of the plurality of sections of the phantom, wherein the analyzing includes using a channelized hotelling observer (CHO) module as a model observer; and displaying, via the printer, the plaque, or the electronic display, a continuous detectability performance measurement function using the determined detectability results.

    Device for determining the perimeter of the surface of an object being
scanned and for limiting reflection from the object surface
    6.
    发明授权
    Device for determining the perimeter of the surface of an object being scanned and for limiting reflection from the object surface 失效
    用于确定被扫描物体的表面的周长并限制物体表面反射的装置

    公开(公告)号:US6029077A

    公开(公告)日:2000-02-22

    申请号:US965149

    申请日:1997-11-06

    IPC分类号: A61B5/00

    CPC分类号: A61B5/0091 A61B5/4312

    摘要: An apparatus for determining the perimeter of an object being scanned comprises a movable arm adapted to follow the surface of an object being scanned as the arm is orbited around the object; the arm having one end being adapted to maintain contact with the surface as the arm is orbited around the object; and an encoder operably connected to the arm for determining the movement of the lever arm at each angular position around the object. An opaque cup is positioned at one end of the lever arm immediately over a point on said surface at which a laser beam impinges on the surface of the object being scanned such that reflection from the surface is retained within the cup.

    摘要翻译: 一种用于确定正被扫描的物体的周边的装置包括一可动臂,适于当所述臂围绕所述物体轨道运动时,跟随被扫描物体的表面; 所述臂的一端适于在所述臂围绕所述物体轨道运动时保持与所述表面的接触; 以及可操作地连接到所述臂的编码器,用于确定所述杠杆臂在所述物体周围的每个角度位置的运动。 不透明杯位于杠杆臂的一端,立即在所述表面上的激光束照射在被扫描物体的表面上的点上,使得来自表面的反射保留在杯内。