Next Generation CAT System
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
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
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
Concept for Non-scanning CT Concept of future wearable CT machines A sketch of a next generation CT for next Nobel Prize
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
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
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
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
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
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
Background Elimination Elimination of background Reference Images
3D Reconstruction by ART Volume Reconstruction by ART (Algebraic Reconstruction Technique) 5 multi-view Images
3D reconstruction results Experimental Results Multi-view images(resolution is 100x200) 3D reconstruction results