Matches in SemOpenAlex for { <https://semopenalex.org/work/W2108307876> ?p ?o ?g. }
Showing items 1 to 96 of
96
with 100 items per page.
- W2108307876 abstract "Purpose: This paper evaluates the effects of computed tomography (CT) image noise and artifacts on quantitative single‐photon emission computed‐tomography (SPECT) imaging, with the aim of establishing an appropriate range of CT acquisition parameters for low‐dose protocols with respect to accurate SPECT attenuation correction (AC). Methods: SPECT images of two geometric and one anthropomorphic phantom were reconstructed iteratively using CT scans acquired at a range of dose levels (CTDI vol = 0.4 to 46 mGy). Resultant SPECT image quality was evaluated by comparing mean signal, background noise, and artifacts to SPECT images reconstructed using the highest dose CT for AC. Noise injection was performed on linear‐attenuation ( μ ) maps to determine the CT noise threshold for accurate AC. Results: High levels of CT noise ( σ ∼ 200–400 HU) resulted in low μ ‐maps noise ( σ ∼ 1%–3%). Noise levels greater than ∼10% in 140 keV μ ‐maps were required to produce visibly perceptible increases of ∼15% in 99m Tc SPECT images. These noise levels would be achieved at low CT dose levels (CTDI vol = 4 μ Gy) that are over 2 orders of magnitude lower than the minimum dose for diagnostic CT scanners. CT noise could also lower (bias) the expected μ values. The relative error in reconstructed SPECT signal trended linearly with the relative shift in μ . SPECT signal was, on average, underestimated in regions corresponding with beam‐hardening artifacts in CT images. Any process that has the potential to change the CT number of a region by ∼100 HU (e.g., misregistration between CT images and SPECT images due to motion, the presence of contrast in CT images) could introduce errors in μ 140 keV on the order of 10%, that in turn, could introduce errors on the order of ∼10% into the reconstructed 99m Tc SPECT image. Conclusions: The impact of CT noise on SPECT noise was demonstrated to be negligible for clinically achievable CT parameters. Because CT dose levels that affect SPECT quantification is low (CTDI vol ∼ 4 μ Gy), the low dose limit for the CT exam as part of SPECT/CT will be guided by CT image quality requirements for anatomical localization and artifact reduction. A CT technique with higher kVp in combination with lower mAs is recommended when low‐dose CT images are used for AC to minimize beam‐hardening artifacts." @default.
- W2108307876 created "2016-06-24" @default.
- W2108307876 creator A5005254525 @default.
- W2108307876 creator A5010191084 @default.
- W2108307876 date "2014-03-20" @default.
- W2108307876 modified "2023-09-27" @default.
- W2108307876 title "Implications of CT noise and artifacts for quantitative <sup>99m</sup>Tc SPECT/CT imaging" @default.
- W2108307876 cites W1976378481 @default.
- W2108307876 cites W2003252564 @default.
- W2108307876 cites W2023573137 @default.
- W2108307876 cites W2033932611 @default.
- W2108307876 cites W2053780696 @default.
- W2108307876 cites W2097595125 @default.
- W2108307876 cites W2114837552 @default.
- W2108307876 cites W2118604851 @default.
- W2108307876 cites W2147492557 @default.
- W2108307876 cites W2154744699 @default.
- W2108307876 cites W2155830965 @default.
- W2108307876 doi "https://doi.org/10.1118/1.4868511" @default.
- W2108307876 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24694155" @default.
- W2108307876 hasPublicationYear "2014" @default.
- W2108307876 type Work @default.
- W2108307876 sameAs 2108307876 @default.
- W2108307876 citedByCount "14" @default.
- W2108307876 countsByYear W21083078762014 @default.
- W2108307876 countsByYear W21083078762015 @default.
- W2108307876 countsByYear W21083078762016 @default.
- W2108307876 countsByYear W21083078762017 @default.
- W2108307876 countsByYear W21083078762018 @default.
- W2108307876 countsByYear W21083078762019 @default.
- W2108307876 countsByYear W21083078762020 @default.
- W2108307876 countsByYear W21083078762021 @default.
- W2108307876 countsByYear W21083078762022 @default.
- W2108307876 crossrefType "journal-article" @default.
- W2108307876 hasAuthorship W2108307876A5005254525 @default.
- W2108307876 hasAuthorship W2108307876A5010191084 @default.
- W2108307876 hasConcept C104293457 @default.
- W2108307876 hasConcept C115961682 @default.
- W2108307876 hasConcept C120665830 @default.
- W2108307876 hasConcept C121332964 @default.
- W2108307876 hasConcept C123688308 @default.
- W2108307876 hasConcept C126838900 @default.
- W2108307876 hasConcept C141379421 @default.
- W2108307876 hasConcept C154945302 @default.
- W2108307876 hasConcept C163716698 @default.
- W2108307876 hasConcept C184652730 @default.
- W2108307876 hasConcept C2775842073 @default.
- W2108307876 hasConcept C2778064278 @default.
- W2108307876 hasConcept C2780441642 @default.
- W2108307876 hasConcept C2984398910 @default.
- W2108307876 hasConcept C2989005 @default.
- W2108307876 hasConcept C35772409 @default.
- W2108307876 hasConcept C41008148 @default.
- W2108307876 hasConcept C55020928 @default.
- W2108307876 hasConcept C71924100 @default.
- W2108307876 hasConcept C99498987 @default.
- W2108307876 hasConceptScore W2108307876C104293457 @default.
- W2108307876 hasConceptScore W2108307876C115961682 @default.
- W2108307876 hasConceptScore W2108307876C120665830 @default.
- W2108307876 hasConceptScore W2108307876C121332964 @default.
- W2108307876 hasConceptScore W2108307876C123688308 @default.
- W2108307876 hasConceptScore W2108307876C126838900 @default.
- W2108307876 hasConceptScore W2108307876C141379421 @default.
- W2108307876 hasConceptScore W2108307876C154945302 @default.
- W2108307876 hasConceptScore W2108307876C163716698 @default.
- W2108307876 hasConceptScore W2108307876C184652730 @default.
- W2108307876 hasConceptScore W2108307876C2775842073 @default.
- W2108307876 hasConceptScore W2108307876C2778064278 @default.
- W2108307876 hasConceptScore W2108307876C2780441642 @default.
- W2108307876 hasConceptScore W2108307876C2984398910 @default.
- W2108307876 hasConceptScore W2108307876C2989005 @default.
- W2108307876 hasConceptScore W2108307876C35772409 @default.
- W2108307876 hasConceptScore W2108307876C41008148 @default.
- W2108307876 hasConceptScore W2108307876C55020928 @default.
- W2108307876 hasConceptScore W2108307876C71924100 @default.
- W2108307876 hasConceptScore W2108307876C99498987 @default.
- W2108307876 hasIssue "4" @default.
- W2108307876 hasLocation W21083078761 @default.
- W2108307876 hasLocation W21083078762 @default.
- W2108307876 hasOpenAccess W2108307876 @default.
- W2108307876 hasPrimaryLocation W21083078761 @default.
- W2108307876 hasRelatedWork W1523361089 @default.
- W2108307876 hasRelatedWork W1762867498 @default.
- W2108307876 hasRelatedWork W2050633524 @default.
- W2108307876 hasRelatedWork W2098022370 @default.
- W2108307876 hasRelatedWork W2099934335 @default.
- W2108307876 hasRelatedWork W2215132873 @default.
- W2108307876 hasRelatedWork W2410135878 @default.
- W2108307876 hasRelatedWork W2545726818 @default.
- W2108307876 hasRelatedWork W2766064800 @default.
- W2108307876 hasRelatedWork W2936370456 @default.
- W2108307876 hasVolume "41" @default.
- W2108307876 isParatext "false" @default.
- W2108307876 isRetracted "false" @default.
- W2108307876 magId "2108307876" @default.
- W2108307876 workType "article" @default.