A. Viskoe
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ABSTRACT: A critical issue in obtaining high-quality images from a computed
tomography system is the mechanical alignment of the data acquisition
system. This paper will compare two methods of measuring and correcting
errors introduced into second-generation computed tomography data sets
from misalignment of the system. Both of these methods use a projection
data set from a complete scan of an object as a starting point. One
method is an iterative method that looks at residual errors in selected
portions of the reconstructed image. The other method requires that the
centroids of the projection data coincide with the centroid of the
object. It will be shown that the centroid registration algorithm can be
used to accurately measure a number of important computed tomography
system alignment parameters and is mathematically efficient. The
residual error algorithm will be shown to give less satisfactory results
IEEE Transactions on Instrumentation and Measurement 11/1999; · 1.21 Impact Factor
