Evaluation of an improved method of simulating lung nodules in chest tomosynthesis
2012 (English)In: Acta Radiologica, ISSN 0284-1851, E-ISSN 1600-0455, Vol. 53, no 8, 874-884 p.Article in journal (Refereed) Published
Background: Simulated pathology is a valuable complement to clinical images in studies aiming at evaluating an imaging technique. In order for a study using simulated pathology to be valid, it is important that the simulated pathology in a realistic way reflect the characteristics of real pathology. less thanbrgreater than less thanbrgreater thanPurpose: To perform a thorough evaluation of a nodule simulation method for chest tomosynthesis, comparing the detection rate and appearance of the artificial nodules with those of real nodules in an observer performance experiment. less thanbrgreater than less thanbrgreater thanMaterial and Methods: A cohort consisting of 64 patients, 38 patients with a total of 129 identified pulmonary nodules and 26 patients without identified pulmonary nodules, was used in the study. Simulated nodules, matching the real clinically found pulmonary nodules by size, attenuation, and location, were created and randomly inserted into the tomosynthesis section images of the patients. Three thoracic radiologists and one radiology resident reviewed the images in an observer performance study divided into two parts. The first part included nodule detection and the second part included rating of the visual appearance of the nodules. The results were evaluated using a modified receiver-operating characteristic (ROC) analysis. less thanbrgreater than less thanbrgreater thanResults: The sensitivities for real and simulated nodules were comparable, as the area under the modified ROC curve (AUC) was close to 0.5 for all observers (range, 0.43-0.55). Even though the ratings of visual appearance for real and simulated nodules overlapped considerably, the statistical analysis revealed that the observers to were able to separate simulated nodules from real nodules (AUC values range 0.70-0.74). less thanbrgreater than less thanbrgreater thanConclusion: The simulation method can be used to create artificial lung nodules that have similar detectability as real nodules in chest tomosynthesis, although experienced thoracic radiologists may be able to distinguish them from real nodules.
Place, publisher, year, edition, pages
Informa Healthcare / Wiley-Blackwell / Royal Society of Medicine Press , 2012. Vol. 53, no 8, 874-884 p.
Thorax, digital radiography, lung, adults, observer performance, technology assessments
National CategoryMedical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-86133DOI: 10.1258/ar.2012.120230ISI: 000310820000009OAI: oai:DiVA.org:liu-86133DiVA: diva2:574945
Funding Agencies|Swedish Research Council|2011-488|Swedish Radiation Safety Authority|2008/22322009/16892010/43632012/2021|King Gustav V Jubilee Clinic Cancer Research Foundation|2007:282008:50|Swedish Federal Government under the LUA/ALF agreement|ALFGBG-136281|Health & Medical Care Committee of the Region Vastra Gotaland|VGFOUREG-12046VGFOUREG-27551VGFOUREG-81341|2012-12-072012-12-072012-12-07