Advances in scatter correction for 3D PET/CT

We report on several significant improvements to the implementation of image-based scatter correction for 3D PET and PET/CT. Among these advances are: a new algorithm to scale the estimated scatter sinogram to the measured data, thereby largely compensating for external scatter; the ability to handl...

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Hauptverfasser: Watson, C.C., Casey, M.E., Michel, C., Bendriem, B.
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Casey, M.E.
Michel, C.
Bendriem, B.
description We report on several significant improvements to the implementation of image-based scatter correction for 3D PET and PET/CT. Among these advances are: a new algorithm to scale the estimated scatter sinogram to the measured data, thereby largely compensating for external scatter; the ability to handle CT image truncation during this scaling; the option to iterate the scatter calculation for improved accuracy; the use of ordered subset estimation maximization (OSEM) reconstruction for the estimated emission images from which the scatter contributions are simulated; reporting of data quality parameters such as scatter and randoms fractions, and noise equivalent count rate (NECR), for each patient bed position; and extensive quality control output. Scatter correction (2 iterations, OSEM) typically requires 15-45 sec per bed. Very good agreement between the estimated scatter and measured emission data for several typical clinical scans is reported for CPS Pico-3D and HiRez LSO PET/CT systems. The data characteristics extracted during scatter correction are useful for patient specific count rate modeling and scan optimization
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subjects Computational modeling
Computed tomography
Crystals
Detectors
Image reconstruction
Noise measurement
Position measurement
Positron emission tomography
Scattering parameters
Technological innovation
title Advances in scatter correction for 3D PET/CT
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