93,436 research outputs found
Normalized medical information visualization
A new mark-up programming language is introduced in order to facilitate and improve the visualization of ISO/EN 13606 dual model-based normalized medical information. This is the first time that visualization of normalized medical information is addressed and the programming language is intended to be used by medical non-IT professionals.S
Citation analysis may severely underestimate the impact of clinical research as compared to basic research
Background: Citation analysis has become an important tool for research
performance assessment in the medical sciences. However, different areas of
medical research may have considerably different citation practices, even
within the same medical field. Because of this, it is unclear to what extent
citation-based bibliometric indicators allow for valid comparisons between
research units active in different areas of medical research.
Methodology: A visualization methodology is introduced that reveals
differences in citation practices between medical research areas. The
methodology extracts terms from the titles and abstracts of a large collection
of publications and uses these terms to visualize the structure of a medical
field and to indicate how research areas within this field differ from each
other in their average citation impact.
Results: Visualizations are provided for 32 medical fields, defined based on
journal subject categories in the Web of Science database. The analysis focuses
on three fields. In each of these fields, there turn out to be large
differences in citation practices between research areas. Low-impact research
areas tend to focus on clinical intervention research, while high-impact
research areas are often more oriented on basic and diagnostic research.
Conclusions: Popular bibliometric indicators, such as the h-index and the
impact factor, do not correct for differences in citation practices between
medical fields. These indicators therefore cannot be used to make accurate
between-field comparisons. More sophisticated bibliometric indicators do
correct for field differences but still fail to take into account within-field
heterogeneity in citation practices. As a consequence, the citation impact of
clinical intervention research may be substantially underestimated in
comparison with basic and diagnostic research
Feature Lines for Illustrating Medical Surface Models: Mathematical Background and Survey
This paper provides a tutorial and survey for a specific kind of illustrative
visualization technique: feature lines. We examine different feature line
methods. For this, we provide the differential geometry behind these concepts
and adapt this mathematical field to the discrete differential geometry. All
discrete differential geometry terms are explained for triangulated surface
meshes. These utilities serve as basis for the feature line methods. We provide
the reader with all knowledge to re-implement every feature line method.
Furthermore, we summarize the methods and suggest a guideline for which kind of
surface which feature line algorithm is best suited. Our work is motivated by,
but not restricted to, medical and biological surface models.Comment: 33 page
Exploring individual user differences in the 2D/3D interaction with medical image data
User-centered design is often performed without regard to individual user differences. In this paper, we report results of an empirical study aimed to evaluate whether computer experience and demographic user characteristics would have an effect on the way people interact with the visualized medical data in a 3D virtual environment using 2D and 3D input devices. We analyzed the interaction through performance data, questionnaires and observations. The results suggest that differences in gender, age and game experience have an effect on peopleâs behavior and task performance, as well as on subjective\ud
user preferences
Adaptive transfer functions: improved multiresolution visualization of medical models
The final publication is available at Springer via http://dx.doi.org/10.1007/s00371-016-1253-9Medical datasets are continuously increasing in size. Although larger models may be available for certain research purposes, in the common clinical practice the models are usually of up to 512x512x2000 voxels. These resolutions exceed the capabilities of conventional GPUs, the ones usually found in the medical doctorsâ desktop PCs. Commercial solutions typically reduce the data by downsampling the dataset iteratively until it fits the available target specifications. The data loss reduces the visualization quality and this is not commonly compensated with other actions that might alleviate its effects. In this paper, we propose adaptive transfer functions, an algorithm that improves the transfer function in downsampled multiresolution models so that the quality of renderings is highly improved. The technique is simple and lightweight, and it is suitable, not only to visualize huge models that would not fit in a GPU, but also to render not-so-large models in mobile GPUs, which are less capable than their desktop counterparts. Moreover, it can also be used to accelerate rendering frame rates using lower levels of the multiresolution hierarchy while still maintaining high-quality results in a focus and context approach. We also show an evaluation of these results based on perceptual metrics.Peer ReviewedPostprint (author's final draft
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