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- W124207890 abstract "A computer simulation study was performed to isolate the effects of various parameters on tomographic image quality derived from view data acquired over 180/sup 0/. The shape of the tomographic point spread function is found to depend on the exact 180/sup 0/ of view data used to perform the reconstruction. Distortions arise because of the view-to-view variation of the planar point spread function caused by changes in the distance between the point source and the camera-collimator system and the associated effects due to attenuation and scatter. Quantitative tomographic studies can thus be compromised by the nature of the 180/sup 0/ view data used for reconstruction. Circumferential profile analysis of simulated myocardium reconstructions in simple attenuators, for example, shows that regional uptake becomes progressively more incorrect as the 180/sup 0/ acquisition becomes more asymmetric about the planar view of maximum cardiac counts. Moreover, for routine 180/sup 0/ tomographic acquisitions, distortion in object shape should be expected for non-symmetric data acquisition. For objects close to the collimator surface, 180/sup 0/ acquisition does provide a significant improvement in tomographic resolution compared to a 360/sup 0/ acquisition." @default.
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- W124207890 date "1984-01-01" @default.
- W124207890 modified "2023-09-24" @default.
- W124207890 title "Effects of 180/sup 0/ acquisition on tomographic image quality" @default.
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