Title :
Time-frequency distribution inversion of the Radon transform [image reconstruction]
Author :
Sahiner, Berkman ; Yagle, Andrew E.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA
fDate :
10/1/1993 12:00:00 AM
Abstract :
In using filtered backprojection to compute the inverse Radon transform, the ramp filter amplifies noise. Spatially invariant noise filters reduce resolution. It is desirable to filter noise where projections have no local high-frequency components. Using the short-time Fourier transform, the authors apply a time-frequency mask filter that zeroes out projections where local signal energy is below a threshold. Results show improvement over reconstructions using spatially invariant smoothing filters
Keywords :
filtering and prediction theory; image reconstruction; time-frequency analysis; transforms; Radon transform; filtered backprojection; image reconstruction; short-time Fourier transform; time-frequency distribution inversion; time-frequency mask filter; Energy resolution; Filtering; Fourier transforms; Image reconstruction; Low pass filters; Noise reduction; Shape; Signal to noise ratio; Spatial resolution; Time frequency analysis;
Journal_Title :
Image Processing, IEEE Transactions on
