公开(公告)号：WO2005073922A1

公开(公告)日：2005-08-11

申请号：PCT/IB2005/050081

申请日：2005-01-06

Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V. ,  U.S. PHILIPS CORPORATION ,  SHECHTER, Gilad

Inventor： SHECHTER, Gilad

IPC: G06T11/00

CPC classification number: G06T11/005

Abstract: A cone or wedge-beam CT scanner (10) generates image data which is potentially artifacted with windmill artifacts which appear to emanate from one or more windmill artifact centers (48). The image data is high-pass filtered (42), and reconstructed (44) to generate an image representation (46) which depicts the windmill artifact centers (48), and a background field (54). A forward projection processor (66) forward projects this image representation to identify data trajectories or rays (60, 62, 64) which pass through a windmill artifact center, a penumbra, or only through the field. Each element of image data is filtered both with a resolution sharpening filter (70) and with a smoothing filter (72). The sharpened and the smoothed data values corresponding to a common ray are weightedly combined (74) in accordance with whether the corresponding common ray passes through a windmill artifact center or only through the field. The weightedly combined filtered data values are reconstructed (66) into an image representation.

Abstract translation: 锥形或楔形光束CT扫描器（10）产生图像数据，该图像数据可能由似乎从一个或多个风车神器中心发出的风车伪影潜在地伪造（48）。 图像数据被高通滤波（42），并重构（44）以产生描绘风车神器体中心（48）的图像表示（46）和背景场（54）。 向前投影处理器（66）向前投影该图像表示以识别穿过风车神器中心，半影或仅通过场的数据轨迹或光线（60,62,64）。 图像数据的每个元素都用分辨率锐化滤波器（70）和平滑滤波器（72）进行滤波。 根据相应的公共射线是通过风车神器中心还是仅通过场，对与普通射线相对应的锐化和平滑的数据值进行加权组合（74）。 加权组合滤波数据值被重构（66）成图像表示。