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- Savage, C., et al.
(författare)
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Turning the tables : When the student teaches the professional - A case description of an innovative teaching approach as told by the students
- 2011
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Ingår i: Nurse Education Today. - : Elsevier BV. - 0260-6917 .- 1532-2793. ; 31:8, s. 803-808
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Tidskriftsartikel (refereegranskat)abstract
- Background: Is it possible to increase the value, meaningfulness, and relevance of a course experience by integrating it with the healthcare context? Students and teachers from a course on organization, learning and leadership sought to explore this possibility through a collaborative effort with nurses from an affiliated teaching hospital. Methods: Working as teachers, students created continuing nursing education (CNE) courses using the Adaptive Reflection process. The students and teachers then researched the experience in terms of: 1) content analysis of student self-reflections (discussion notes and logbooks) on the learning process, 2) a student self-assessed outcome achievement survey, and 3) perceived relevance of the CNE courses by the clinical nurse educators. Results: Thirteen nursing students created three CNE courses together with sixteen nurses. Each course consisted of multiple 20-minute long web-based modules with automatic formative feedback. In the process, students exceeded course outcome-levels, journeyed from chaos to confidence and experienced new ways of viewing the group and their own capabilities. Conclusions: The innovative design of the course moved the focus from student-centered learning to learning by contributing to health care. Working in a real world context, the content of the students' efforts and the skills they developed not only met course requirements, but were also aligned with the needs of the wards. This contribution was valued by the students and the RNs which enhanced students' feelings of self-confidence. Further research lies in testing the model in other contexts.
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| 4. |
- Hollmark, M, 1975-, et al.
(författare)
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Influence of multiple scattering and energy loss straggling on the absorbed dose distributions of therapeutic light ion beams : I. Analytical pencil beam model.
- 2004
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Ingår i: Phys Med Biol. - : IOP Publishing. - 0031-9155 .- 1361-6560. ; 49:14, s. 3247-3265
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The lateral and longitudinal distributions of absorbed dose of broad and narrowlight ion beams in water are investigated. An analytical algorithm based on thegeneralized Fermi–Eyges theory is developed and used to calculate the effectsof multiple scattering and range straggling on the dose distribution of light ionbeams in water. A first-order Gaussian multiple scattering and energy lossstraggling approach is generally sufficiently accurate for describing the lateraland longitudinal spread of the Bragg peak and the associated energy depositiondistribution of therapeutic light ion beams at ranges of clinical interest. Nuclearreactions are not taken into account in this study. The analytical algorithmgiven in the present study allows an accurate description of the radial spreadand the range straggling of light ions traversing matter. A verification of thisapproach by comparing with experimental data, Monte Carlo methods andother analytical techniques will be presented in a forthcoming paper.
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| 7. |
- Lindblom, Emely, et al.
(författare)
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Defining the hypoxic target volume based on positron emission tomography for image guided radiotherapy – the influence of the choice of the reference region and conversion function
- 2017
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Ingår i: Acta Oncologica. - Oxfordshire : Taylor & Francis. - 0284-186X .- 1651-226X. ; 56:6, s. 819-825
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Tidskriftsartikel (refereegranskat)abstract
- Background: Hypoxia imaged by positron emission tomography (PET) is a potential target for optimization in radiotherapy. However, the implementation of this approach with respect to the conversion of intensities in the images into oxygenation and radiosensitivity maps is not straightforward. This study investigated the feasibility of applying two conversion approaches previously derived for 18F-labeled fluoromisonidazole (18F-FMISO)-PET images for the hypoxia tracer 18F-flortanidazole (18F-HX4).Material and methods: Ten non-small-cell lung cancer patients imaged with 18F-HX4 before the start of radiotherapy were considered in this study. PET image uptake was normalized to a well-oxygenated reference region and subsequently linear and non-linear conversions were used to determine tissue oxygenations maps. These were subsequently used to delineate hypoxic volumes based partial oxygen pressure (pO2) thresholds. The results were compared to hypoxic volumes segmented using a tissue-to-background ratio of 1.4 for 18F-HX4 uptake.Results: While the linear conversion function was not found to result in realistic oxygenation maps, the non-linear function resulted in reasonably sized sub-volumes in good agreement with uptake-based segmented volumes for a limited range of pO2 thresholds. However, the pO2 values corresponding to this range were significantly higher than what is normally considered as hypoxia. The similarity in size, shape, and relative location between uptake-based sub-volumes and volumes based on the conversion to pO2 suggests that the relationship between uptake and pO2 is similar for 18F-FMISO and 18F-HX4, but that the model parameters need to be adjusted for the latter.Conclusions: A non-linear conversion function between uptake and oxygen partial pressure for 18F-FMISO-PET could be applied to 18F-HX4 images to delineate hypoxic sub-volumes of similar size, shape, and relative location as based directly on the uptake. In order to apply the model for e.g., dose-painting, new parameters need to be derived for the accurate calculation of dose-modifying factors for this tracer.
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