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- W1616865637 abstract "Abstract : The planar positron camera is a three-dimensional imaging device with two parallel and planar large crystal detectors. The spatial calibration problem is to define the relation between the raw digitized detector output to a physical coordinate system in the imaged space. In a calibration procedure, a positron point source is placed in a series of known emission locations during data acquisition. Data is then fit to a mathematical model to estimate spatial offsets and gains in the detector. Fitting procedures require some assumptions about error distribution, and the assumption of normally distributed error used in least-squares estimation does not appear suitable for these detectors. In simulated data sets, alternative non-normal distributions (robust estimators) allowed successful recovery of camera spatial parameters even with a few hundred total detected positron emissions. With experimental data, the robust procedures avoided the unreasonable camera performance parameters estimated by least squares. Keywords: Positron; Instrumentation; Image; Mathematical model; Error distribution; Crystal detectors." @default.
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- W1616865637 date "1988-10-01" @default.
- W1616865637 modified "2023-09-23" @default.
- W1616865637 title "Robust Spatial Calibration of a Planar Positron Camera" @default.
- W1616865637 hasPublicationYear "1988" @default.
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