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GLYPHS IN LAYERED 2D MEDICAL VISUALISATIONS
Simon Walton
THEMES
• Glyphs in medical visualisation, generally
• Combining glyphs with other types of visual representations
GLYPHS IN MEDICAL VIS
• Glyphs in both research and clinical settings
• Clinicians still want numbers
• Perceptual bias is an issue
• Large variance in accuracy of perception
• Laying out glyphs can be an issue
POSITIONING GLYPHS
• Do we allow overlaps?
• What is the significance of each glyph’s position?
• Strategies (Ward)
• Data-driven
• Structure-driven
POSITIONING GLYPHS
OTHER CONSIDERATIONS
• Do we want some glyphs to pop out?
• Can emphasise using visual perception theory
• What parameter mapping function is used?
• Continuous or discrete?
DIFFUSION TENSOR IMAGING
Eigenvectors
Ellipse
DIFFUSION TENSOR IMAGING
DIFFUSION TENSOR IMAGING
CMR VISUALISATION
CMR VISUALISATION
raw heatmap
vector glyph
NEW DIFFICULTY
=>LUT
CAN WE DO BETTER?Spatial
frequencyDensity of coverage Transparency Colour
important?
Heart Low High No Yes
Heatmap Low Low Variable No
Vector High Low Variable No
Glyphs High Low No Yes
CONCLUSION
• Layered visualisations largely an unsolved problem
• Do the benefits for the application outweigh the challenges?
• A layered visualisation can be `modulated’ to assist user’s visual decomposition of each layer
• How many visual channels can we use before the visualisation becomes useless?