Title :
A filtered-backprojection algorithm for astigmatic SPECT reconstruction
Author :
Wang, Huili ; Jaszczak, Ronald J. ; Coleman, R. Edward
Author_Institution :
Duke Univ. Med. Center, Durham, NC, USA
fDate :
30 Oct-5 Nov 1994
Abstract :
A filtered backprojection algorithm is presented for astigmatic collimation. The reconstruction algorithm is derived based on the image reconstruction algorithm derived by Feldkamp et al. (see J. Opt. Soc. A, vol. 1, p. 612-19, 1984) for cone beam collimation. The derived algorithm is validated based on Monte Carlo simulated data. Using the astigmatic reconstruction algorithm, the authors demonstrate the capability of astigmatic collimation to balance the trade-off among axial blurring, field-of-view, and collimator sensitivity for selecting a convergent beam collimation. Reconstructed images also demonstrate that astigmatic collimation can provide improved axial blurring with increased collimator sensitivity compared to cone beam collimation
Keywords :
Monte Carlo methods; image reconstruction; medical image processing; single photon emission computed tomography; Monte Carlo simulated data; astigmatic SPECT reconstruction; astigmatic collimation; axial blurring; collimator sensitivity; cone beam collimation; convergent beam collimation; field-of-view; filtered-backprojection algorithm; medical diagnostic imaging; nuclear medicine; Biomedical imaging; Cancer; Collimators; Focusing; Geometry; Image converters; Image reconstruction; Monte Carlo methods; Radiology; Reconstruction algorithms;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record
Conference_Location :
Norfolk, VA
Print_ISBN :
0-7803-2544-3
DOI :
10.1109/NSSMIC.1994.474690
