MIIT 2013
Digital Breast Tomosynthesis: Future of visualizationMIIT – 2013 TorontoKetan Thanki
5/24/2013
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FFDM Vs DBTFu
ll Fi
eld
Dig
ital
Mam
mog
raph
y • Single Frame images
• Conventional Data sets
• Established workflow
Dig
ital
Bre
ast
Tom
osys
nthe
sis • Multi-Frame
image stacks
• Larger Data sets
• Intensive workflow: dynamic browsing through image stacks
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Visualization challenges of DBT study
Limitation of LCD response & cine through multiple images1
Detection probability while scrolling through slices2
Workflow & Time to interpret3
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Limitation of LCD response & cine through multiple images1
LCD Response time deceiving
Large Variations in transition times
2-3 Frames to refresh
Result: Blurring20ms of
Frame time 50+ ms of transition time
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Blurring on traditional FFDM display during cine
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Detection probability while scrolling through slices2
[Lia06] Temporal Response Measurements of Medical Liquid Crystal Displays, Hongye Liang and Aldo Badano, SPIE medical Imaging 2006
Slow average transition times
Blurring when browsing through
image stack
Result: Masking of subtle image
features Eg. On a typical 5 MegaPixel medical display, the fastest transition is +/- 15ms while the slowest transition requires 150ms (more than 10 display frames) to complete (source: [Lia06])
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Subtle details during cine
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Workflow & Time to interpret3
• Flicker…Pan/Zoom
• Freeze & focus…Magnify
(Continuous zoom)
• Slow fading…Toggle comparison
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Some Technologies
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Rapidframe
Blurring during cine Smooth cine
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Rapidframe Clinical pilot results:
Browsing speed: 25 slices/second
10% higher AUC compared to FFDM
display
Statistically significant
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Ultra high luminance
x2
x1
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Ultra-high Luminance:
PACS display= 500 cd/m2
Tomo display = 1000cd/m2
“Hot light”= 2000 cd/m2
Hot Light toolTemporary boostfor subtle details
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JNDs: Visible shades of gray
Hot Light toolTemporary boostfor subtle details
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Quantification of Detection Probabilityof Microcalcifications at Increased Display
Luminance Levels
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Tomosynthesis Displays:
Three factors for efficient reading time and accuracy
Cine without blur technology
Ultra-high luminance with “Hot light” for subtle details
Display controller with enough memory to hold large stacks of images10-bit imaging:Synchronized to display refresh rate & frame rate
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References
Medical Display optimized for Digital Breast Tomosynthesis▫ T Kimpe, MS, Kortrijk, _ BEL; A Xthona; C Marchessoux
Quantification of Detection Probability of Micro-calcifications at Increased Display Luminance Levels
▫ Tom R.L. Kimpe and Albert Xthona
Multimodality breast imaging using RapidFrame™▫ Albert Xthona