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  • Asplund, Sara, 1976-, et al. (författare)
  • Extended analysis of the effect of learning with feedback on the detectability of pulmonary nodules in chest tomosynthesis
  • 2011
  • Ingår i: Progress in Biomedical Optics and Imaging - Proceedings of SPIE. - 1605-7422. ; 7966
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • In chest tomosynthesis, low-dose projections collected over a limited angular range are used for reconstruction of section images of the chest, resulting in a reduction of disturbing anatomy at a moderate increase in radiation dose compared to chest radiography. In a previous study, we investigated the effects of learning with feedback on the detection of pulmonary nodules in chest tomosynthesis. Six observers with varying degrees of experience of chest tomosynthesis analyzed tomosynthesis cases for presence of pulmonary nodules. The cases were analyzed before and after learning with feedback. Multidetector computed tomography (MDCT) was used as reference. The differences in performance between the two readings were calculated using the jackknife alternative free-response receiver operating characteristics (JAFROC-2) as primary measure of detectability. Significant differences between the readings were found only for observers inexperienced in chest tomosynthesis. The purpose of the present study was to extend the statistical analysis of the results of the previous study, including JAFROC-1 analysis and FROC curves in the analysis. The results are consistent with the results of the previous study and, furthermore, JAFROC-1 gave lower p-values than JAFROC-2 for the observers who improved their performance after learning with feedback. © 2011 SPIE.
  • Asplund, Sara, 1976-, et al. (författare)
  • Learning aspects and potential pitfalls regarding detection of pulmonary nodules in chest tomosynthesis and proposed related quality criteria.
  • 2011
  • Ingår i: Acta radiologica. - 1600-0455. ; 52:5, s. 503-512
  • Tidskriftsartikel (refereegranskat)abstract
    • Background In chest tomosynthesis, low-dose projections collected over a limited angular range are used for reconstruction of an arbitrary number of section images of the chest, resulting in a moderately increased radiation dose compared to chest radiography. Purpose To investigate the effects of learning with feedback on the detection of pulmonary nodules for observers with varying experience of chest tomosynthesis, to identify pitfalls regarding detection of pulmonary nodules, and present suggestions for how to avoid them, and to adapt the European quality criteria for chest radiography and computed tomography (CT) to chest tomosynthesis. Material and Methods Six observers analyzed tomosynthesis cases for presence of nodules in a jackknife alternative free-response receiver-operating characteristics (JAFROC) study. CT was used as reference. The same tomosynthesis cases were analyzed before and after learning with feedback, which included a collective learning session. The difference in performance between the two readings was calculated using the JAFROC figure of merit as principal measure of detectability. Results Significant improvement in performance after learning with feedback was found only for observers inexperienced in tomosynthesis. At the collective learning session, localization of pleural and subpleural nodules or structures was identified as the main difficulty in analyzing tomosynthesis images. Conclusion The results indicate that inexperienced observers can reach a high level of performance regarding nodule detection in tomosynthesis after learning with feedback and that the main problem with chest tomosynthesis is related to the limited depth resolution.
  • Abrandt Dahlgren, Madeleine, et al. (författare)
  • Video as a Tool for Researching Simulation Practices
  • 2019
  • Ingår i: Interprofessional Simulation in Health Care. Abrandt Dahlgren M., Rystedt H., Felländer-Tsai L., Nyström S. (red.). - Cham : Springer. - 2210-5549 .- 2210-5557. - 978-3-030-19542-7 ; s. 31-55
  • Bokkapitel (refereegranskat)abstract
    • This chapter provides examples of how arrangements for collection and analyses of video data were organized across different sites. The common approach to data collection builds on established methods for recording of audiovisual materials in the social sciences with a focus on interaction and learning. The chapter describes how arrangements for data collection across different sites were organised, and how video analysis can be used as a method for collaborative analysis of practices. One approach is entitled purposeful approach to collaborative data analysis. A second approach draws on video-based studies of situated action, and a third approach of analysis is the use of qualitatively different readings of the same data. One does not replace the other, but rather draws out different features.
  • Abrandt Dahlgren, M., et al. (författare)
  • Why This Book?
  • 2019
  • Ingår i: Interprofessional Simulation in Health Care. Professional and Practice-based Learning, vol 26. Abrandt Dahlgren M., Rystedt H., Felländer-Tsai L., Nyström S. (eds). - Springer. - 2210-5549. - 978-3-030-19541-0 ; s. 3-8
  • Bokkapitel (övrigt vetenskapligt)abstract
    • The introductory chapter provides a backdrop to and problematization of simulation as a pedagogical technology for interprofessional learning in health care education and practice. The chapter also discusses the relation to the changing views on professional learning and the current discourses on the increasing complexity of future health care. The dominating scientific, technical rationalities of professional practice as simply the application of theoretical knowledge, possessed by individuals, are being challenged. Recent theorizations of practice instead suggest alternative views of knowledge as being embodied and relational, intertwined with ethical reasoning and materiality. There is a global call for health care education reform and interprofessional learning to resolve patient safety issues. However, there is a lack of research with a particular view on interprofessional simulation, and hence a need of scrutiny and development the pedagogy for simulation practice. © 2019, Springer Nature Switzerland AG.
  • Almén, Anja, 1964-, et al. (författare)
  • 2016
  • Ingår i: Radiation protection dosimetry. - 1742-3406. ; 169:1-4, s. 425-429
  • Tidskriftsartikel (refereegranskat)abstract
    • The overall purpose of this work was to explore how video recordings can contribute to the process of optimising occupational radiation protection in image-guided interventions. Video-recorded material from two image-guided interventions was produced and used to investigate to what extent it is conceivable to observe and assess dose-affecting actions in video recordings. Using the recorded material, it was to some extent possible to connect the choice of imaging techniques to the medical events during the procedure and, to a less extent, to connect these technical and medical issues to the occupational exposure. It was possible to identify a relationship between occupational exposure level to staffand positioning and use of shielding. However, detailed values of the dose rates were not possible to observe on the recordings, and the change in occupational exposure level from adjustments of exposure settings was not possible to identify. In conclusion, the use of video recordings is a promising tool to identify doseaffecting instances, allowing for a deeper knowledge of the interdependency between the management of the medical procedure, the applied imaging technology and the occupational exposure level. However, for a full information about the dose-affecting actions, the equipment used and the recording settings have to be thoroughly planned.
  • Bradley, Linda, 1961-, et al. (författare)
  • A Design for Intercultural Exchange – An Analysis of Engineering Students’ Interaction with English Majors in a Poetry Blog
  • 2011
  • Ingår i: Second language teaching and learning with technology: views of emergent researchers. - 978-1-908416-00-1 ; 229
  • Bokkapitel (övrigt vetenskapligt)abstract
    • Web based writing platforms allowing for exchanges across the world are increasingly being used in education. These recent forms of textual practice are highly related to conditions offered by the technology, allowing users, who previously were primarily consumers, to become producers of text. This chapter investigates student interaction over a blog in an intercultural student exchange between native speakers and nonnative speakers of English in higher education analysing and interpreting poetry. The groups of students involved in this study belong not only to different academic disciplines, but also differ in terms of nationality and language background. In the blog posts, the students’ cultural voices are heard, offering a meeting between very contrasting groups. Scrutinising thestudent postings, the threaded discussions show ways that students thematise content and meaning in the poems. The results show that there are a number of features at play in an intercultural environment where language and translation issues are prominent parts of the student discussions, offering extended perspectives to the students’ initial views. Collaborative efforts in such a diverse environment are important when negotiating meaning and extending students’ understanding of poetry.
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