Nonscanning CT computerized tomography Standard CT system CTcomputerized tomography creates 3D views of what is inside General medical imaging technique to look inside of a patient body Background ID: 257859
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Slide1
Next Generation CAT SystemSlide2
Non-scanning CT (computerized tomography)
Standard CT system
CT(computerized tomography) creates 3D views of what is inside
General medical imaging technique to look inside of a patient’ bodySlide3
Background
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.
Motivation
Hounsfield’s sketch
The first inventor of CT, Hounsfield
(Nobel Prize winner, 1979) Slide4
CT Development History
1
st
: Linear & rotational CT
2
nd
: Multiple scanning CT
3
rd
: Fan-beam CT
4
th
: spiral CT or helical CT
5
th
?
No scan
Compact
SafeSlide5
Concept for Non-scanning CT
Concept of future wearable CT machines
A sketch of a next generation CT
for next Nobel Prize Slide6
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 reconstructionSlide7
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
Decoupling to multi-view images
3D Reconstruction
Shield Field systemSlide8
Related Technique
Tomographic
Reconstruction of Transparent Objects
(
Borislav Trifonov et al. [2006] )
A glass object
3D reconstruction of a transparent object by tomography
using 72~360 captured images
Limitation : Requirement of moving system and many captured images
One of 360 images
Reconstruction Result
Capturing SystemSlide9
Experimental System
Schematic diagram of system
6~16 LEDs and a translucent object are used here.
150x100 pinhole array
(pinhole diameter of 428 microns)
Actual system
Canon EOS 450D
(12M pixels)Slide10
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
3D shape Reconstruction
Decoupling to multi-view images
Single shot CT for a translucent objectSlide11
Decoupling Process
Decoding process of a coded 4D light field image
A Single shot LF image
Decoupled multi-view imagesSlide12
Background Elimination
Elimination of background
Reference ImagesSlide13
3D Reconstruction by ART
Volume Reconstruction by ART
(Algebraic Reconstruction Technique)
5 multi-view ImagesSlide14
Experimental Results
3D reconstruction results
Multi-view images(resolution is 100x200)