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    • 7. 发明授权
    • Scintillation camera uniformity correction
    • US4223221A
    • 1980-09-16
    • US917070
    • 1978-06-19
    • Michael R. GambiniGary Benenson
    • Michael R. GambiniGary Benenson
    • A61B6/00G01T1/164G01T1/20G01T1/208
    • G01T1/1642
    • A two-stage system for enhancing the imaging uniformity of a scintillation camera is disclosed. The camera includes means for detecting radiation events and for producing radiation count signals indicating the location and energy level of individual detected radiation events. The uniformity correction system compensates for imprecision in the camera's indication of both radiation event regional image count density and event energy level. Compensation for energy indication errors is done by a first stage, prior to a second stage correction for residual nonuniformity in regional image count density. The operations of both stages are carried out in real time for each individual radiation count, independently of the production of other counts.The first stage location and stores a representation of the respective peaks of the detected energy pulse height distribution for each of a plurality of regions in the camera's field of view. This regional profile of the camera's energy response characteristic is used to successively realign for each count the pulse height energy window defined by the camera imaging circuitry, to align the window over the respective energy peak for each count as a function of the count's location indication.The second uniformity correction stage, a flood correction circuit, produces and stores a profile of regional variation in the image count density indicated by the camera in response to a uniform radiation flood over its field. This stored information is used for calculating regional count density correction factors for different regions of the camera field. The correction factors are used for controlling the ratio of radiation counts corresponding to each region which are actually imaged, thus eliminating residual nonuniformity caused by nonuniform regional image count density produced by the camera.No scintillation camera is capable of producing radiation count signals which define either the location or the energy level of radiation events with absolute precision. Minute inaccuracies in the location, and energy level decoding cause nonuniformity in the image count density of the scintillation camera systems.The uniformity of image count density of a scintillation camera detector can be degraded by factors including inaccuracies in energy level decoding, inaccuracies in location (x-y) decoding, nonlinearity), regional variations in detector sensitivity, and other factors.
    • 10. 发明授权
    • Emissive computed tomography
    • 发射计算机断层扫描
    • US4645933A
    • 1987-02-24
    • US522309
    • 1983-07-29
    • Michael R. GambiniRonald J. MartoneDonald S. KearnsGary W. EnosRudi FrankeHerbert Schoeppy
    • Michael R. GambiniRonald J. MartoneDonald S. KearnsGary W. EnosRudi FrankeHerbert Schoeppy
    • A61B6/00G01T1/164G01T1/166
    • A61B6/447A61B6/037A61B6/4405
    • A medical diagnostic system utilizing the principles of nuclear medicine is disclosed. The system includes a gantry having a detector support section supported by a carriage section located on a rail system for movement along a linear path. A nuclear detector is supported on a pair of weighted arms pivotally mounted on the detector support system about an axis perpendicular to the rail system. The detector is itself pivotally mounted near an end of the weighted arm pair for tilting rotation about an axis parallel to the arm pivot axis. Mechanism is provided for rotating the weighted arms additionally about an axis parallel to the rail system, in order to accomplish orbital motion of the detector. All three of these rotational movements are power actuated. A stationary pedestal and cantilevered patient support table is located between the rails of the rail system, with the patient table extending longitudinally with respect to the rails. The upper, or detector supporting section, of the gantry is additionally provided with a degree of freedom wherein it may be rotated about a vertical axis extending through the middle portion of the carriage system, thus disposing the detector for operation at a location alongside, and not between the rails.
    • PCT No.PCT / US82 / 00813 Sec。 371日期1983年7月29日第 102(e)日期1983年7月29日PCT申请1982年6月16日。公开了利用核医学原理的医疗诊断系统。 该系统包括具有检测器支撑部分的台架,该检测器支撑部分由位于轨道系统上的用于沿着线性路径移动的托架部分支撑。 核检测器支撑在围绕垂直于轨道系统的轴线枢转地安装在检测器支撑系统上的一对加重臂上。 检测器本身可枢转地安装在加重臂对的端部附近,用于围绕平行于臂枢转轴线的轴线倾斜旋转。 提供了用于围绕平行于轨道系统的轴线旋转加权臂的机构,以便完成检测器的轨道运动。 所有这三个旋转运动都是动力驱动的。 固定基座和悬臂患者支撑台位于轨道系统的轨道之间,患者台相对于轨道纵向延伸。 机架的上部或检测器支撑部分另外提供了一个自由度,其中它可以围绕延伸穿过滑架系统的中间部分的垂直轴线旋转,从而将检测器设置在一起的位置,并且 不在轨道之间。