Qualitative Prediction Of Image Discrepancies Due To Object-Time Dependence In Several Computed Tomography (CT) Geometries

James E. Holden; Wingfat R.

doi:10.1117/12.957153

6 July 1979 Qualitative Prediction Of Image Discrepancies Due To Object-Time Dependence In Several Computed Tomography (CT) Geometries

James E. Holden, Wingfat R.

Author Affiliations +

Proceedings Volume 0173, Application of Optical Instrumentation in Medicine VII; (1979) https://doi.org/10.1117/12.957153
Event: Application of Optical Instrumentation in Medicine VII, 1979, Toronto, Canada

Abstract

In dynamic radiological modalities the frame duration is often constrained to be comparable to characteristic times of the imaged dynamic process. The results can be interpreted as temporally averaged 'time exposures' only if the regional sensitivity distribution of the instrument is time independent. This condition fails for all transmission and most emission computed tomographic (CT) devices, in which only a fraction of the total number of rays is being measured at any instant. The CT image discrepancies from the ideal temporal average over the scan duration can influence the extraction of quantitative results from the data. A general theory of these discrepancies is difficult because a time dependent data collection geometry imaging a time dependent object is no longer spatially invariant in general. We have developed a conceptual scheme for the qualitative assessment of discrepancies due to time dependence. The scheme is evaluated by comparison of its predictions with computer simulations of two physiologically relevant time dependences imaged in six CT geometries.

Citation Download Citation

James E. Holden and Wingfat R. "Qualitative Prediction Of Image Discrepancies Due To Object-Time Dependence In Several Computed Tomography (CT) Geometries", Proc. SPIE 0173, Application of Optical Instrumentation in Medicine VII, (6 July 1979); https://doi.org/10.1117/12.957153

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