Maximum likelihood reconstruction for cone beam spect with camera tilt
Iterative Maximum Likelihood (ML) reconstruction techniques are extended to the cone beam SPECT geometry with camera head tilted relative to the axis of rotation. The resulting code is an extension of a previous cone beam ML code for the untilted case. The details of the code development are described, which includes the variable camera sensitivity, but excludes resolution, attenuation, and scatter. The code is tested as a function of iteration in comparison with an existing tilt angle filtered backprojection (FBP) code, which has known distortions due to an incomplete theory. For a variety of point sources, as well as for a brain phantom, the tilt angle cone beam ML code (TCBML) performs visually and quantitatively better than cone beam FBP (CB-FBP), and it removes the distortions inherent in CB-FBP. The TCBML code requires substantial computation time which depends on the source geometry being reconstructed and varies in the present work from 3.5 to 50 times longer than the CB-FBP code. © 1989 IEEE
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Related Subject Headings
- Nuclear & Particles Physics
- 5106 Nuclear and plasma physics
- 0903 Biomedical Engineering
- 0299 Other Physical Sciences
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Nuclear & Particles Physics
- 5106 Nuclear and plasma physics
- 0903 Biomedical Engineering
- 0299 Other Physical Sciences
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics