PHASE CORRECTION AND BAND-PASS FILTERS IN CT IMAGING

Zhao Shengmei，

Jiang Dazhen

Nuclear Science and Techniques

pp.101-107

Published in print 01 May 1993

28401

This paper reports the use of the fast Fourier transform (FFT) in the direct Fourier transform method (DFM) in Computerized Tomography (CT) reconstruction. Phase corrections are needed in the CT reconstruction. In order to eliminate the image distortion from the basic DFM, Padding and band-pass filters are used in the improved DFM. Finally, some reconstructions from simulated projections and several experimental results are given.

CT imagingPhase correctionBand-pass filtersFourier transformationPadding

REFERENCES

Lewitt R M. Proceedings of the IEEE, 1983; 71(3): 390

Mersereau R M. Comput Biol Med, 1976; 6: 247

Stark H, Woods J W, Paul I et al. IEEE Trans. on acoustic speech and signal pro., 1981; Assp 29(2): 237

Mersereau R M, Oppenheim A V, Pro. of IEEE, 1974; 62(10): 1319

Macovski A. Proceedings of IEEE, 1983; 71(3): 373

Shepp L A, Logan B F. IEEE Trans on Nucl Sci, 1974; 228

Peled A, Liu B. Digital signal processing -theory, design, and implementation. New York: John Wiley & Sons INC., 1976: 142- 156

Matej S, Bjla I. IEEE Trans on Med Img, 1990; 9(4): 421