Impact of the Fano Factor on Position and Energy Estimation in Scintillation Detectors
The Fano factor for an integer-valued random variable is defined as the ratio of its variance to its mean. Light from various scintillation crystals have been reported to have Fano factors from sub-Poisson (Fano factor < 1) to super-Poisson (Fano factor > 1). For a given mean, a smaller Fano f...
| Veröffentlicht in: | IEEE transactions on nuclear science. - 1988. - 62(2015), 1 vom: 01. Feb., Seite 42-56 |
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| Weitere Verfasser: | , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2015
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| Zugriff auf das übergeordnete Werk: | IEEE transactions on nuclear science |
| Schlagworte: | Journal Article Cramér-Rao bound Fano factor Fisher information matrix energy estimation energy resolution maximum-likelihood estimator position estimation scintillators spatial resolution |
| Zusammenfassung: | The Fano factor for an integer-valued random variable is defined as the ratio of its variance to its mean. Light from various scintillation crystals have been reported to have Fano factors from sub-Poisson (Fano factor < 1) to super-Poisson (Fano factor > 1). For a given mean, a smaller Fano factor implies a smaller variance and thus less noise. We investigated if lower noise in the scintillation light will result in better spatial and energy resolutions. The impact of Fano factor on the estimation of position of interaction and energy deposited in simple gamma-camera geometries is estimated by two methods - calculating the Cramér-Rao bound and estimating the variance of a maximum likelihood estimator. The methods are consistent with each other and indicate that when estimating the position of interaction and energy deposited by a gamma-ray photon, the Fano factor of a scintillator does not affect the spatial resolution. A smaller Fano factor results in a better energy resolution |
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| Beschreibung: | Date Completed 03.11.2015 Date Revised 13.11.2018 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 0018-9499 |
| DOI: | 10.1109/TNS.2014.2379620 |