1. Next Generation CAT System

2. Non-scanning CT (computerized tomography)
CT(computerized tomography) creates 3D views of what is inside
General medical imaging technique to look inside of a patient’ body
Standard CT system

3. The first inventor of CT, Hounsfield (Nobel Prize winner, 1979)
Background
Motivation
CT machines take much time(15~20min) and real-time operation is a challenging issue.
A huge system has been required for scanning mechanism since the first invention.
The first inventor of CT, Hounsfield (Nobel Prize winner, 1979)
Hounsfield’s sketch

4. CT Development History
No scan Compact Safe
1st : Linear & rotational CT
4th: spiral CT or helical CT
2nd : Multiple scanning CT
3rd : Fan-beam CT

5. Concept for Non-scanning CT
Concept of future wearable CT machines
A sketch of a next generation CT
for next Nobel Prize

6. Comparison between current and conceptual CTs
State-of-the-art CT (Aquilion ONE ) Toshiba Medical System, 2006
Conceptual diagram of ascan-free CT
For real-time 3D reconstruction

7. Decoupling to multi-view images
Related Technique
Shield Field Imaging (Douglas Lanman, Ramesh Raskar et al. [2008] )
Shadow-based 3D reconstruction by a single shot image
Limitation : impossibility to local concave and backside shapes
A single shot image
Shield Field system
3D Reconstruction
Decoupling to multi-view images

8. Related Technique
Tomographic Reconstruction of Transparent Objects ( Borislav Trifonov et al. [2006] )
3D reconstruction of a transparent object by tomography
using 72~360 captured images  Limitation : Requirement of moving system and many captured images
Capturing System
A glass object
One of 360 images
Reconstruction Result

9. 150x100 pinhole array (pinhole diameter of 428 microns)
Experimental System
6~16 LEDs and a translucent object are used here.
Canon EOS 450D (12M pixels)
Schematic diagram of system
150x100 pinhole array (pinhole diameter of 428 microns)
Actual system

10. Non-scanning CT based on light field capturing
3D Reconstruction of transparent objects using visible light with a single shot photo
Limitation : 3D reconstruction in low resolution because decoupled multi-view images are in low resolution, 80x80
A single shot photo
Single shot CT for a translucent object
3D shape Reconstruction
Decoupling to multi-view images

11. Decoupling Process Decoding process of a coded 4D light field image
A Single shot LF image
Decoupled multi-view images
Decoding process of a coded 4D light field image

12. Background Elimination
Elimination of background 
Reference Images

13. 3D Reconstruction by ART
Volume Reconstruction by ART (Algebraic Reconstruction Technique)
5 multi-view Images

14. 3D reconstruction results
Experimental Results
Multi-view images(resolution is 100x200)
3D reconstruction results