ArticleEJNMMI physics2025
A critical phantom study of the energy window used for
Article in EJNMMI physics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Quantitative accuracy ofEJNMMI physics · 2026Article
- Instrumentation Digital Twins in PET and SPECT Imaging: Current Status, Challenges, and Future Directions.Computational and structural biotechnology journal · 2026Review
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2 authors.
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Abstract
backgroundThis study investigated, mainly for quantitative
methodsTwo uniform and two cold and hot rod contrast cylindrical phantoms of various sizes were scanned with the Starguide system to acquire a very high number of counts. After rebinning the list-mode files for different energy windows, data were reconstructed with manufacturer's iterative algorithm including attenuation correction, resolution recovery and eventually scatter correction, but without any regularization technique. Cold rod residual scatter fraction, hot and cold rod contrast recovery coefficient, coefficient of variation in phantom uniform areas and quantification accuracy using calibration with one of the homogeneous phantoms were, among others, computed.
resultsNarrow symmetric photopeak-centred windows or fully asymmetric (≥ 140 keV) window led, on one hand, to decreased scatter residual fraction and sensitivity and, on the other hand, to increased noise, cold and hot recovery coefficients when compared to a standard 15-20% wide symmetric window. With a 6-7% wide symmetric window we obtained very comparable results to the dual energy window scatter correction used by the manufacturer for all measured parameters, but larger recovery coefficients especially for small hot objects in a cold background. Similar results were obtained with the fully asymmetric window at the cost of a higher noise level resulting from a drastic reduction of the sensitivity.
conclusionsNarrow symmetric or asymmetric energy windows were found an interesting alternative to the standard dual energy window method to reject
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