Adaptive correction of scatter and random events for 3-D backprojected PET data

Backprojected images offer compact and accurate storage of three-dimensional (3-D) positron emission tomography (PET) data and so are potentially very suited to high-resolution 3-D PET scanners. However, there are very few methods available for correcting backprojected images for the effects of scat...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2001-08, Vol.48 (4), p.1350-1356
Main Authors: Reader, A.J., Sha Zhao, Julyan, P.J., Hastings, D.L., Zweit, J.
Format: Article
Language:English
Subjects:
Attenuation
Computer simulation
Convolution
Detectors
Image reconstruction
Image storage
Mathematical models
Memory
Positron emission
Positron emission tomography
Radioactive decay
Response functions
Scatter
Scattering
Studies
Tomography
Whole-body PET
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Summary:Backprojected images offer compact and accurate storage of three-dimensional (3-D) positron emission tomography (PET) data and so are potentially very suited to high-resolution 3-D PET scanners. However, there are very few methods available for correcting backprojected images for the effects of scatter and random events. Scatter correction methods usually involve experimental measurement of scatter response functions or accurate simulations, and are thus limited by the accuracy of the model used. In contrast, the approach proposed here uniquely adapts a general form of a combined scatter and random response function. This method inherently does not rely upon accurate determination of the scatter and random response functions but does, however, rely upon knowledge of the attenuating object's outline. The technique is able to adapt to different imaging situations and account for detector scatter, and in particular is readily implemented in backprojection space. The method has been implemented for a small-volume HIDAC (II) PET scanner.
ISSN:0018-9499
1558-1578
DOI:10.1109/23.958351