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Next Generation CAT System

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. Background. Motivation.

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Next Generation CAT System

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  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. 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 5th ? No scanCompactSafe 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. Related Technique Shield Field Imaging (Douglas Lanman, RameshRaskar 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 ( BorislavTrifonov 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 One of 360 images Reconstruction Result A glass object

  9. 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 Decoupled multi-view images A Single shot LF image 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. Experimental Results Multi-view images(resolution is 100x200) 3D reconstruction results

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