Abstract
Experimental studies have been made of the impulse response and noise characteristics of a tomographic system using a gamma camera. Fourier transform, deconvolution and iterative methods have been used with a CDC 6600 computer to reconstruct images from data obtained for various experimental arrangements of sources in a cylindrical phantom. It is shown that with an appropriate attenuation correction the impulse response in the reconstruction is substantially constant, independent of the position of the source in the phantom and that the reconstruction technique used is of secondary importance.
The resolution obtained for the impulse response and the relative noise level throughout the “non image” part of the reconstructions is shown for different experimental situations.
The measured variance in the reconstruction of an extended uniform activity source was found to be somewhat below the theoretical value except at high count densities (above 1,000 counts per image element) where the limit of accuracy of the reconstruction is shown to be imposed by the variation in the camera sensitivity over the field of view.
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References
Bracewell, R.N., Riddle, A.C.: Inversion of fan beam scans in radioastronomy. Astrophys. J. 150, 427–434 (1967)
Brooks, R.A., Di Chiro, G.: Principles of computer assisted tomography (CAT) in radiographic and radioisotope imaging. Phys. Med. Biol. 21, 689–732 (1976)
Budinger, R.F., Gullberg, G.T.: Three dimensional reconstruction in nuclear medicine imaging. IEEE Trans. Nucl. Sci. NS21(3), 2–20 (1974)
Budinger, T.F., Gullberg, G.T.: Three dimensional reconstruction of isotope distributions. Phys. Med. Biol. 19, 387–389 (1974a)
Budinger, T.F., Derenzo, S.E., Gullberg, G.T., Greenberg, W.K., Huesman, R.H.: Medical radionuclide imaging, Vienna: IAEA 1977
Crowther, R.A., Klug, A.: Three dimensional image reconstruction on an extended field—a fast stable algorithm. Nature (Lond.) 252, 490–492 (1974)
De Rosier, D.J., Klug, A.: Reconstruction of 3-dimensional structures from electron micrographs. Nature (Lond.) 217, 130–134 (1968)
Friedman, M.I., Beattie, J.W., Laughlin, J.S.: Cross-sectional absorption density reconstruction for treatment planning. Phys. Med. Biol. 19, 819–830 (1974)
Gordon, R., Bender, R., Herman, G.T.: Algebraic reconstruction techniques (ART) for 3D electron microscopy and X-ray photography. J. Theor. Biol. 29, 471–481 (1970)
Gordon, R., Herman, G.T.: Three dimensional reconstruction from projections: a review of algorithms. Int. Rev. Cytol. 38, 111–155 (1974)
Hounsfield, G.N.: Computerised transverse axial scanning tomography Part 1. Brit. J. Radiol. 46, 1016–1022 (1973)
Huesman, R.H.: Analysis of statistical errors for transverse section reconstruction. Lawrence Berkeley Laboratory Report LBL 4279, Univ. Calif. 1975
Huesman, R.H.: The effects of a finite number of projection angles and finite lateral sampling of projections on the propagation of statistical errors in transverse section reconstruction. Phys. Med. Biol. 22, 511–521 (1977)
Keyes, W.I.: A practical approach to transverse section gamma ray imaging. Brit. J. Radiol. 49, 62–70 (1976)
Klug, A., Crowther, R.A.: Three dimensional image reconstruction from the viewpoint of information theory. Nature (Lond.) 238, 435 (1972)
Ramachandran, G.N., Lakshminarayanan, A.V.: Three dimensional reconstruction from radiographs and electron micrographs: Application of convolutions instead of Fourier transforms. Proc. Nat. Acad. Sci. USA 68, 2236–2240 (1971)
Shepp, L.A., Logan, B.F.: The Fourier reconstruction of a head section. IEEE Trans. Nucl. Sci. NS21, (3), 21–43 (1974)
Simons, H.A.B., Lonn, A.H.R., Cotrall, M.F.: Three dimensional image reconstruction from gamma-camera images. Proc. 4th Int. Conf. Med. Phys. Ottawa, Canada, I.O.P.M. 1976
Smith, P.R., Peters, T.M., Bates, R.H.T.: Image reconstruction from finite numbers of projections. J. Phys. A: Math. Nucl. Gen. 6, 361–382 (1973)
Tanaka, E., Iinuma, T.A.: Correction functions for optimizing the reconstructed image in transverse section scan. Phys. Med. Biol. 20, 789–798 (1975)
Tothill, P.: Limitations of the use of the geometric mean to obtain depth independence in scanning and whole body counting. Phys. Med. Biol. 19, 382 (1974)
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Lonn, A., Cottrall, M. & Simons, H. Experimental measurement of impulse response and noise for an emission computed tomography system. Eur J Nucl Med 4, 251–259 (1979). https://doi.org/10.1007/BF00304880
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DOI: https://doi.org/10.1007/BF00304880