Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/6337
Título: A method to determine the impact of reduced visual function on nodule detection performance
Autor: Thompson, J. D.
Lança, Carla Costa
Lança, Luís
Hogg, Peter
Palavras-chave: Visual acuity
Observer performance
JAFROC
Visual function
Data: Jan-2017
Editora: Elsevier
Citação: Thompson 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.
Resumo: Purpose - 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.
Peer review: yes
URI: http://hdl.handle.net/10400.21/6337
DOI: 10.1016/j.radi.2016.07.002
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S1078817416300463
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