公开(公告)号：US06771997B2

公开(公告)日：2004-08-03

申请号：US09952846

申请日：2001-09-11

申请人： Robert W. Schaffer

发明人： Robert W. Schaffer

IPC分类号： A61B5055

CPC分类号： G01R33/5676

摘要： The effects of complex motion of the heart and surrounding anatomy due to cardiac and respiratory motion is reduced in high resolution imaging of coronary arteries using a diminishing variance algorithm (DVA) using a navigator for tracking heart motion and iteratively reacquiring data frames where a data frame has a positional variance from a cumulative histogram of data. A target position is continually calculated from the cumulative histogram which is smoothed such as by low-pass filtering to continually provide a target position. An image histogram is developed based on a limited number of image frames which are iteratively replaced to attain desired image quality.

摘要翻译： 使用减少的方差算法（DVA）使用导航仪跟踪心脏运动并迭代重新获取数据帧，其中心脏和呼吸运动引起的心脏和周围解剖结构复杂运动的影响在冠状动脉的高分辨率成像中降低 具有与数据的累积直方图的位置差异。 从平滑的累积直方图连续计算目标位置，例如通过低通滤波以持续提供目标位置。 基于有限数量的图像帧开发图像直方图，该图像帧被迭代地替换以获得期望的图像质量。

公开(公告)号：US4831419A

公开(公告)日：1989-05-16

申请号：US155349

申请日：1988-02-12

申请人： Thomas C. Iaia, Jr. ,  James A. Herley ,  Roger C. Male ,  William J. McLaughlin ,  Douglas A. McKeown ,  Robert W. Schaffer ,  Robert P. Siegel ,  Charles W. Spehrly, Jr.

发明人： Thomas C. Iaia, Jr. ,  James A. Herley ,  Roger C. Male ,  William J. McLaughlin ,  Douglas A. McKeown ,  Robert W. Schaffer ,  Robert P. Siegel ,  Charles W. Spehrly, Jr.

IPC分类号： G03B27/62 ,  B65H5/02 ,  B65H5/22 ,  G03B27/64 ,  G03G15/00 ,  G03G15/04

CPC分类号： B65H11/005 ,  B65H5/224 ,  G03B27/64 ,  B65H2406/323

摘要： A document handler 20 for presenting documents to the platen 23 of a copier 10 for copying with a vacuum belt platen transport system 32 having document transporting belts 35 movable under a substantially planar vacuum plenum backing and imaging background surface 33a overlying the platen, and a vacuum system 33 for applying a partial vacuum to a document sheet being transported by the movable belts over the platen; with a clamping and unclamping system for moving the vacuum plenum backing and imaging background surface 33a against the platen 23 to flatten the belts 35 and a document thereon against the platen for copying. During unclamping the surface 33a slightly fits away from the platen, while supplying the partial vacuum to lift a document away from the platen retained on the belts, by first lifting a first side of the surface 33a up away from the platen substantially before the opposite side, and then subsequently lifting the opposite side, to generate a controlled air flow for assisting in retaining the documents to the belts, and moving the belts when the surface is lifted away from the platen. During clamping the first side of the surface 33a moves towards the platen beginning slightly before the opposite side to generate a controlled air flow expulsion of air.