X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Reexamination Certificate
2005-06-09
2008-09-30
Thomas, Courtney (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
C378S004000
Reexamination Certificate
active
07430270
ABSTRACT:
The invention relates to a computerized tomography method, wherein a radiation source executes an nPi relative movement along a helix with respect to an object. Acquired measured values are partially derived according to the angular position of the radiation source on the helix and intermediate filter values are generated by filtering the derived measured values along the filter lines with a k filter. Each intermediate filter value is multiplied by a filter factor, where the filter factor for intermediate filter values that have been generated by filtering the derived measured values along filter lines, which run exclusively within the Pi window, is greater than or equal to those filter factors by which the intermediate filter values are multiplied, which have been generated by filtering the derived measured values along filter lines, which run inside as well as outside the Pi window. The intermediate filter values assigned to a measured value are added to a filter value and the filter values are back-projected for reconstruction of a CT image.
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Bontus Claas
Kohler Thomas
Koninklijke Philips Electronics , N.V.
Taningco Alexander H
Thomas Courtney
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