Appeal No. 1999-0831
Application No. 08/576,066
computed tomography system has at least two rows of detector
cells that are displaced along the z-axis.
Claim 1 is illustrative of the claimed invention, and it
reads as follows:
1. A system for determining and adjusting x-ray
beam position in a multi-slice computed tomography
system, the computed tomography system including an
x-ray source having a focal spot and a multi-slice
detector having at least two rows of detector cells
displaced along a z-axis, the x-ray source producing
an x-ray beam along the z-axis, said beam position
determining and adjusting system comprising an
adjustable prepatient collimator aligned with the x-
ray source so that a beam from the x-ray source is
directed towards said collimator, a collimator
tracking unit coupled to said collimator for
adjusting the position of said collimator, and a
control computer coupled to the detector cells for
receiving signals from the cells, said control
computer coupled to said collimator tracking unit
for providing control signals thereto, said control
computer configured to:
obtain separate signals from a first
detector cell in the first detector cell row and
a second detector cell in the second detector
cell row of the detector;
determine beam position from the
intensities of the separate signals; and
provide control signals to said collimator
tracking unit to control adjustment of said
prepatient collimator based on a determined beam
position.
3
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