Nucl Med Mol Imaging.
2008 Feb;42(1):52-60.
Compensation Methods for Non-uniform and Incomplete Data Sampling in High Resolution PET with Multiple Scintillation Crystal Layers
- Affiliations
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- 1Department of Nuclear Medicine, College of Medicine, Seoul National University, Korea. hongseongj@gmail.com
- 2Department of Biomedical Sciences, College of Medicine, Seoul National University, Korea.
- 3Department of Biomedical Engineering, College of Medicine, Seoul National University, Korea.
- 4Institute of Radiation Medicine, Medical Research Center, Seoul National University, Korea.
- 5Department of Physics, Korea University, Korea.
- 6Department of Physics, Konkuk University
Abstract
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PURPOSE: To establish the methods for sinogram formation and correction in order to appropriately apply the filtered backprojection (FBP) reconstruction algorithm to the data acquired using PET scanner with multiple scintillation crystal layers.
MATERIAL AND METHODS: Formation for raw PET data storage and conversion methods from listmode data to histogram and sinogram were optimized. To solve the various problems occurred while the raw histogram was converted into sinogram, optimal sampling strategy and sampling efficiency correction method were investigated. Gap compensation methods that is unique in this system were also investigated. All the sinogram data were reconstructed using 2D filtered backprojection algorithm and compared to estimate the improvements by the correction algorithms.
RESULTS
Optimal radial sampling interval and number of angular samples in terms of the sampling theorem and sampling efficiency correction algorithm were pitch/2 and 120, respectively. By applying the sampling efficiency correction and gap compensation, artifacts and background noise on the reconstructed image could be reduced.
CONCLUSION
Conversion method from the histogram to sinogram was investigated for the FBP reconstruction of data acquired using multiple scintillation crystal layers. This method will be useful for the fast 2D reconstruction of multiple crystal layer PET data.
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