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Copyright © 2014 Turner Innovations. All rights reserved.
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Three-Dimensional Backscatter
X-Ray Imaging
In-Space Inspection Technology Workshop
D. Clark Turner, PhD, CEO
July 15, 2014
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Presentation Outline
• 3D Backscatter X-ray System
– Approach
– Phase I Results
– Phase 2 Design and Results
• Miniaturization of X-ray Components
– Design Issues
• Roadmap to Handheld BSCT
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Acknowledgements
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• NASA STTR # NNX11CC68C
• University of Utah – Scientific Computing
Institute
– Dr. Ross Whitaker
– Dr. John Schreiner
• ARIBEX
– Dr. Arturo Reyes
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Backscatter CT
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How do we get 3D images from single side inspection?
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System Characteristics
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• Collimated “staring array” detector for 2D images
• A cone-beam x-ray source is used, allowing:
• Simultaneous 2D image data collection
• Large field of view
• Reduce data collection time
• Rotationally movable system – Automated collection of 2D images 360º around the object to be imaged
• A 3D-processing computed tomography model
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Phase 1 Approach
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Initial Results
Typical void-in-foam images taken with initial system setup
350º 310º 270º 230º 190º
150º 110º 70º 30º 0º
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Initial Results
Multiples images of a void-in-acrylic with metallic objects using initial system setup
310º 270º 220º 180º 130º
90º 40º 0º Background at 0º
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Learnings for Phase 2
Improvements to initial system design:
• Brighter x-ray source
• Wider x-ray source cone beam
• A digital detector (instead of a Photostimulated Plate (PSP) used in the initial setup)
• Stacked collimator for better resolution
• System automation for use in a more realistic environment
•
•
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Phase 2 Design
Prototype design
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Improved Resolution
• Stacked collimator grids
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Photo courtesy Nuclear Fields, Inc.
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US Quarter
coin
Aluminum
“coin”
Concept Results
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Cross-void for System Validation
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2D images of cross-void
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• R
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Three different orientations to the cross-void
Reconstructions at various planes in sample
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• System architecture developed
• 3D reconstruction algorithms
• Prototype delivered to NASA 9/2013
• Three (3) patent applications
• Next Steps
• Improvements in hardware
• Improvements in software
• Need Phase 3 funding
3D Backscatter CT Imaging
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OTHER APPLICATIONS
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• Composite Materials
• Cargo Inspection
• NDT and explosive detection
• Construction and Related Industries
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Can We Make it Handheld?
To meet the size requirement for a Handheld
Backscatter CT system (BSCT) we need:
• Small, lightweight detectors
• Focusing optics for large field of view
• Compact, light-weight x-ray sources
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Yesterday’s science fiction
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Today’s Reality
Handheld XRF analyzers
• Lead in toys
• Metals and Mineralogy
• Scrap metal sorting
• ROHS/WHEE compliance
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Handheld Imaging
ARIBEX NOMAD Pro
• Intra-oral x-ray imaging
• Weight reduced to 5.5 lbs
• mA increased to 2.5mA
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Prior Art
• Oil-filled enclosure
• Lead-foil shielding
• Problems –
• Weight
• Leaks
• Maintenance
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Aribex Innovations
• Split high-voltage • Only have to hold off ½ voltage
• +/- 30kV
• Silicone Potting
• “Secret Sauce” • Shielding – High Z material in
the silicone
• <3 lbs in HVPS/Tube module
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Handheld BSCT – Concept 1
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Handheld BSCT – Concept 2
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Handheld BSCT – Concept 3
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Focusing Optics
3D printed tungsten collimator grids
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Photos courtesy of Radiation Protection Technologies
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How Do We Get There? – Alt. 1
Photos Courtesy xxxxxx, Inc.
- Confidential -
Prototype 120kV tube & HVPS
• Advantages
• More compact size
– Grounded anode
– Disadvantages
– Max current unknown??
– Filament isolation??
End-Window Design
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How Do We Get There? – Alt. 2
Split high-voltage concept
X-ray Tube
+75kV
-75kV
Prototype 80kV tube Photo Courtesy xxxxxx, Inc.
- Confidential -
• Advantages
• More mass in tube anode
– Better heat conduction
– Max. 75kV HV standoff
– Internal radiation shield
– Disadvantages
– 2 power supplies – Cost
– Slightly heavier
– Hard to get heat out
Split High-Voltage Design
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Summary
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• Preliminary results show good promise for
Backscatter CT systems
• Miniaturization of other x-ray modalities has
already occurred.
• Proposed Roadmap for Handheld
Backscatter CT (BSCT) through source,
detector, and optics miniaturization
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Copyright © 2014 Turner Innovations. All rights reserved.
Thank You!
D. Clark Turner, PhD
President & CEO
Turner Innovations, LC
1119 S 1680 W
Orem, UT 84058
801-796-2951 www.turnerinnovation.com