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A method to determine the impact of reduced visual function on nodule detection performance

2017-01Journal article Restricted access
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dc.contributor.authorThompson, J. D.
dc.contributor.authorLança, Carla
dc.contributor.authorLança, Luís
dc.contributor.authorHogg, Peter
dc.date.accessioned2016-08-02T15:22:29Z
dc.date.available2016-08-02T15:22:29Z
dc.date.issued2017-01
dc.description.abstractPurpose - In this study we aim to validate a method to assess the impact of reduced visual function and observer performance concurrently with a nodule detection task. Materials and methods - Three consultant radiologists completed a nodule detection task under three conditions: without visual defocus (0.00 Dioptres; D), and with two different magnitudes of visual defocus (−1.00 D and −2.00 D). Defocus was applied with lenses and visual function was assessed prior to each image evaluation. Observers evaluated the same cases on each occasion; this comprised of 50 abnormal cases containing 1–4 simulated nodules (5, 8, 10 and 12 mm spherical diameter, 100 HU) placed within a phantom, and 25 normal cases (images containing no nodules). Data was collected under the free-response paradigm and analysed using Rjafroc. A difference in nodule detection performance would be considered significant at p < 0.05. Results - All observers had acceptable visual function prior to beginning the nodule detection task. Visual acuity was reduced to an unacceptable level for two observers when defocussed to −1.00 D and for one observer when defocussed to −2.00 D. Stereoacuity was unacceptable for one observer when defocussed to −2.00 D. Despite unsatisfactory visual function in the presence of defocus we were unable to find a statistically significant difference in nodule detection performance (F(2,4) = 3.55, p = 0.130). Conclusion - A method to assess visual function and observer performance is proposed. In this pilot evaluation we were unable to detect any difference in nodule detection performance when using lenses to reduce visual function.pt_PT
dc.identifier.citationThompson JD, Lança CC, Lança L, Hogg P. A method to determine the impact of reduced visual function on nodule detection performance. Radiography. 2017;23(1):19-24.pt_PT
dc.identifier.doi10.1016/j.radi.2016.07.002pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.21/6337
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S1078817416300463pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/pt_PT
dc.subjectVisual acuitypt_PT
dc.subjectObserver performancept_PT
dc.subjectJAFROCpt_PT
dc.subjectVisual functionpt_PT
dc.titleA method to determine the impact of reduced visual function on nodule detection performancept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleRadiographypt_PT
oaire.citation.volume22pt_PT
person.familyNameLança
person.givenNameCarla
person.identifier.ciencia-id601A-6412-BF2F
person.identifier.orcid0000-0001-9918-787X
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication0320b455-ee19-4670-8bf2-10dce9de1bec
relation.isAuthorOfPublication.latestForDiscovery0320b455-ee19-4670-8bf2-10dce9de1bec

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