The application of DFT and FFT techniques provides a simpler detector alignment procedure in a fourth generation computed tomography system. A single scan of a circularly symmetric object can be used to provide the alignment data for this technique. Due to the symmetry involved, filtered autoconvolution employing an FFT technique similar to that used in CT reconstruction generates the locus of the perceived detector positions (known as the alignment curve). The fundamental components of this curve are seperated using a DFT to generate the actual detector alignment correction values. Applying these Fourier techniques to the CT alignment problem has simplified the calibration procedure necessary. Other applications having accurate positioning requirements may also benefit from these techniques.

Date Published: 1 May 1989
PDF: 10 pages
Proc. SPIE 1090, Medical Imaging III: Image Formation, (1 May 1989); doi: 10.1117/12.953234

Published in SPIE Proceedings Vol. 1090:
Medical Imaging III: Image Formation
Samuel J. Dwyer; R. Gilbert Jost; Roger H. Schneider, Editor(s)