Methods and apparatus for simplified filtering of scan data in a

Details Methods and apparatus for simplified filtering of scan data in a Methods and apparatus for simplified filtering of scan data in a

1996-12-26

1998-06-02

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, A61B 603

Patent

active

057612676

ABSTRACT:
The present invention, in one embodiment, is a system for performing image reconstruction from unfiltered scan data acquired in a tomographic scan. More specifically, the system implements an algorithm for unfiltered scan data which eliminates the requirement that the scan data for a particular view be fully filtered for image reconstruction. Particularly, unfiltered scan data for a base view is fully filtered to generate filtered scan data for the base view. At least a portion of the filtered scan data for the base view is then used for subsequent views. Particularly, for a subsequent view, only the high frequency components of unfiltered scan data for that view are filtered with a short filter. The filtered high frequency components then are added to the low frequency components of the filtered base view scan data to estimate fully filtered scan data for the subsequent view.

REFERENCES:
patent: 5359638 (1994-10-01), Hsieh et al.
patent: 5473655 (1995-12-01), Hu
patent: 5561695 (1996-10-01), Hu

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