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Computer Processing of Scans Using Fourier and Other Transformations

University of Colorado Medical Center and Veterans Administration Hospital, Denver, Colorado

Correspondence: For reprints contact: D. W. Brown, Nuclear Medicine Service, V.A. Hospital, 1055 Clermont St., Denver, Colo. 80220.

ABSTRACT

Methods of achieving resolution enhancement of radionuclide scans by computer processing are being investigated. A digital array of scan data is transformed from the spatial to the frequency domain using a two-dimensional Fast Fourier Transform algorithm. A frequency domain filter which combines smoothing and deconvolution with the modulation transfer function of the scanning system is then applied, followed by inversion back to the spatial domain. Differential, homomorphic, and other filtering techniques, as well as Hadamard transforms, are also being studied. Resolution enhancement of phantom and patient scans has been achieved, but the degree of improvement not yet quantitated.

FOOTNOTES

^* Present address: IBM Watson Research Center, Yorktown Heights, N.Y.