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|a eng
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|a Hunter, William C J
|e verfasserin
|4 aut
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|a Multiple-hit parameter estimation in monolithic detectors
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Revised 21.10.2021
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a We examine a maximum-a-priori (MAP) method for estimating the primary interaction position of gamma rays with multiple-interaction sites (hits) in a monolithic detector. In assessing the performance of a multiple-hit estimator over that of a conventional one-hit estimator, we consider a few different detector and readout configurations of a 50-mm-wide square LSO block. For this study, we use simulated data from SCOUT, a Monte-Carlo tool for photon tracking and modeling scintillation-camera output. With this tool, we determine estimate bias and variance for a multiple-hit estimator and compare these with similar metrics for a conventional ML estimator, which assumes full energy deposition in one hit. We also examine the effect of event filtering on these metrics; for this purpose, we use a likelihood threshold to reject signals that are not likely to have been produced under the assumed likelihood model.Depending on detector design, we observe a 1-12% improvement of intrinsic resolution for a 1-or-2-hit estimator as compared with a 1-hit estimator. We also observe improved differentiation of photopeak events using a 1-or-2-hit estimator as compared with the 1-hit estimator; more than 6% of photopeak events that were rejected by likelihood filtering for the 1-hit estimator were accurately identified as photo peak events and positioned without loss of resolution by a 1-or-2-hit estimator
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|a Journal Article
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1 |
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|a Barrett, Harrison H
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Miyaoka, Robert S
|e verfasserin
|4 aut
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| 700 |
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|a Lewellen, Tom K
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t IEEE transactions on nuclear science
|d 1988
|g (2011) vom: 15., Seite 2224-2229
|w (DE-627)NLM098149350
|x 0018-9499
|7 nnns
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| 773 |
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|g year:2011
|g day:15
|g pages:2224-2229
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|a AR
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|j 2011
|b 15
|h 2224-2229
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