Title:
投影法及び逆投影法並びにその実行アルゴリズム
Document Type and Number:
Japanese Patent JP4293307
Kind Code:
B2
Abstract:
Methods for projecting and backprojecting rays with respect to pixels/detector bins to attenuate/eliminate high-frequency artifacts, are disclosed. The first two methods are adaptations of pixel-driven and ray-driven linear interpolation techniques respectively. In these techniques, the window or shadow of each pixel/bin is dynamically adjusted and projected onto the detector bin/pixel to eliminate gaps between the shadows. This allows the effect of each pixel on a given detector bin (or vice versa) to be appropriately weighted. A third is a distance-driven technique wherein the transitions of the pixels and the detector bins are respectively projected onto a common axis. This allows a determination of the contribution of each of the pixels/bins for each of the bins/pixels with lower computation time and improved artifact free images.
Inventors:
De Man, Bruno Christian Bernard
Bus, Samito Kumar
Bus, Samito Kumar
Application Number:
JP2003586840A
Publication Date:
July 08, 2009
Filing Date:
April 15, 2003
Export Citation:
Assignee:
GENERAL ELECTRIC COMPANY
International Classes:
A61B6/03; G06T1/00; G06T11/00
Domestic Patent References:
| JP2002058666A |
Foreign References:
| US5848114 | ||||
| US6351514 | ||||
| US6339632 |
Other References:
Schwinger R.B. et.al,Area weighted convolutional interpolation for data reprojection in single photon emission computed tomography,Med. Phys,米国,American Association of Physicists in Medicine,1986年 5月,Volume 13, Issue 3,pp.350-353
Attorney, Agent or Firm:
Arakawa Satoshi
Hirokazu Ogura
Nobukazu Ito
Toshihisa Kurokawa
Hirokazu Ogura
Nobukazu Ito
Toshihisa Kurokawa