4/spl pi/ Compton imaging using a 3-D position-sensitive CdZnTe detector via weighted list-mode maximum likelihood
| Autor: | Feng Zhang, Zhong He, C.E. Lehner |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Physics
Nuclear and High Energy Physics business.industry Resolution (electron density) Detector Compton scattering Iterative reconstruction Maximum likelihood sequence estimation Optics Nuclear Energy and Engineering Position (vector) Electrical and Electronic Engineering business Sensitivity (electronics) Energy (signal processing) |
| Zdroj: | IEEE Transactions on Nuclear Science. 51:1618-1624 |
| ISSN: | 0018-9499 |
| DOI: | 10.1109/tns.2004.832573 |
| Popis: | In this work we describe a 4/spl pi/ Compton imager composed of a single 15 mm /spl times/ 15 mm /spl times/ 10 mm CdZnTe detector. The anode is pixellated into an 11 /spl times/ 11 array to provide position sensitivity in two dimensions. The third coordinate is determined from the observed timing of signals in the detector. The position resolution is approximately 1.2 mm in each dimension. The energy resolution is about 2% for two-pixel events at 662 keV. Images are reconstructed via list-mode maximum likelihood (ML). A new weighting method for ML reconstruction is proposed in which the contributions of small-uncertainty sequences are enhanced relative to sequences with large uncertainties. The new reconstruction method is compared with traditional ML techniques for measured imaging data. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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