Matches in SemOpenAlex for { <https://semopenalex.org/work/W2079497630> ?p ?o ?g. }
Showing items 1 to 77 of
77
with 100 items per page.
- W2079497630 endingPage "2079" @default.
- W2079497630 startingPage "2079" @default.
- W2079497630 abstract "Purpose: To investigate how the exposure level and structural background affect the detection of computer-simulated nodules in digital chest phantom images. Method and Materials: Images of an anthropomorphic chest phantom were acquired with an a-Si/CsI flat-panel based digital radiography system at 120 kVp and a tube current ranging from 0.25 to 32 mAs. The source-to-image distance (SID) was increased and the x-ray beam filtered to further reduce the exposure levels. 1-cm diameter computer-simulated nodules with a contrast ratio of 2.68% were computer generated at various locations of the chest images. Two-alternate forced choice (2-AFC) experiments were performed to measure the ratio of correct observations as a function of the exposure level for various structural backgrounds present. For each exposure level and location, 30 pairs of 512×512 images were generated and displayed in pairs on a review workstation for reading. The ratio of correct observations versus exposure levels were computed from the reading scores for various locations. The plots along with the exposures corresponding to 90% accuracy were used to study the effects of structural backgrounds. Results: For all regions, the accuracy generally increases from 0.5 to 1.0 with the exposure. However, the threshold exposure for 90% accuracy varies with the location. In the abdomen region, the ratio of correct observations reaches 90% at a higher exposure level (∼ 0.4 mAs). In the lung region, the ratio reaches 90% at a much lower exposure level (∼ 0.0625 mAs). The difference in the threshold exposures may be due to the heavier attenuation in the abdomen region. Complexity of structural backgrounds may affect the threshold exposure and the level and consistency of the ratios measured. This work was supported in part by a research grant EB000117 from the NIBIB and a research grant CA104759 from the NCI." @default.
- W2079497630 created "2016-06-24" @default.
- W2079497630 creator A5004288652 @default.
- W2079497630 creator A5010191084 @default.
- W2079497630 creator A5035160285 @default.
- W2079497630 creator A5037627431 @default.
- W2079497630 creator A5038763932 @default.
- W2079497630 creator A5041078152 @default.
- W2079497630 creator A5043870061 @default.
- W2079497630 creator A5054223453 @default.
- W2079497630 creator A5074996913 @default.
- W2079497630 creator A5089080746 @default.
- W2079497630 date "2005-05-26" @default.
- W2079497630 modified "2023-10-18" @default.
- W2079497630 title "TU-C-I-609-03: Effects of Exposure and Structural Background On the Detection of Computer-Simulated Nodules in Digital Chest Phantom Images: 2-AFC Study" @default.
- W2079497630 doi "https://doi.org/10.1118/1.1998334" @default.
- W2079497630 hasPublicationYear "2005" @default.
- W2079497630 type Work @default.
- W2079497630 sameAs 2079497630 @default.
- W2079497630 citedByCount "1" @default.
- W2079497630 countsByYear W20794976302017 @default.
- W2079497630 crossrefType "journal-article" @default.
- W2079497630 hasAuthorship W2079497630A5004288652 @default.
- W2079497630 hasAuthorship W2079497630A5010191084 @default.
- W2079497630 hasAuthorship W2079497630A5035160285 @default.
- W2079497630 hasAuthorship W2079497630A5037627431 @default.
- W2079497630 hasAuthorship W2079497630A5038763932 @default.
- W2079497630 hasAuthorship W2079497630A5041078152 @default.
- W2079497630 hasAuthorship W2079497630A5043870061 @default.
- W2079497630 hasAuthorship W2079497630A5054223453 @default.
- W2079497630 hasAuthorship W2079497630A5074996913 @default.
- W2079497630 hasAuthorship W2079497630A5089080746 @default.
- W2079497630 hasConcept C104293457 @default.
- W2079497630 hasConcept C115961682 @default.
- W2079497630 hasConcept C126838900 @default.
- W2079497630 hasConcept C134093067 @default.
- W2079497630 hasConcept C154945302 @default.
- W2079497630 hasConcept C178451039 @default.
- W2079497630 hasConcept C2781305912 @default.
- W2079497630 hasConcept C2989005 @default.
- W2079497630 hasConcept C36454342 @default.
- W2079497630 hasConcept C41008148 @default.
- W2079497630 hasConcept C55020928 @default.
- W2079497630 hasConcept C71924100 @default.
- W2079497630 hasConceptScore W2079497630C104293457 @default.
- W2079497630 hasConceptScore W2079497630C115961682 @default.
- W2079497630 hasConceptScore W2079497630C126838900 @default.
- W2079497630 hasConceptScore W2079497630C134093067 @default.
- W2079497630 hasConceptScore W2079497630C154945302 @default.
- W2079497630 hasConceptScore W2079497630C178451039 @default.
- W2079497630 hasConceptScore W2079497630C2781305912 @default.
- W2079497630 hasConceptScore W2079497630C2989005 @default.
- W2079497630 hasConceptScore W2079497630C36454342 @default.
- W2079497630 hasConceptScore W2079497630C41008148 @default.
- W2079497630 hasConceptScore W2079497630C55020928 @default.
- W2079497630 hasConceptScore W2079497630C71924100 @default.
- W2079497630 hasIssue "6Part15" @default.
- W2079497630 hasLocation W20794976301 @default.
- W2079497630 hasOpenAccess W2079497630 @default.
- W2079497630 hasPrimaryLocation W20794976301 @default.
- W2079497630 hasRelatedWork W1978897449 @default.
- W2079497630 hasRelatedWork W1984866049 @default.
- W2079497630 hasRelatedWork W2034118986 @default.
- W2079497630 hasRelatedWork W2148836764 @default.
- W2079497630 hasRelatedWork W2364019987 @default.
- W2079497630 hasRelatedWork W2400331279 @default.
- W2079497630 hasRelatedWork W2808628240 @default.
- W2079497630 hasRelatedWork W3184937900 @default.
- W2079497630 hasRelatedWork W4239437254 @default.
- W2079497630 hasRelatedWork W1785885165 @default.
- W2079497630 hasVolume "32" @default.
- W2079497630 isParatext "false" @default.
- W2079497630 isRetracted "false" @default.
- W2079497630 magId "2079497630" @default.
- W2079497630 workType "article" @default.