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heavy duty rotation disk

Geometry Calibration for High Resolution Small Animal Imaging Vi-Hoa (Tim) Tran Thomas Jefferson National Accelerator Facilities. Rotating SPECT Gantry. slider. heavy duty rotation disk. pinhole detector. AOR. parallel detector. Gamma Cameras. optical tracking CCD cameras.

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heavy duty rotation disk

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  1. Geometry Calibration for High Resolution Small Animal ImagingVi-Hoa (Tim) TranThomas Jefferson National Accelerator Facilities

  2. Rotating SPECT Gantry slider heavy duty rotation disk pinhole detector AOR parallel detector Gamma Cameras optical tracking CCD cameras

  3. Geometry Calibration To determine the spatial relationship between the coordinate systems of the rotating detectors and the objects

  4. Calibration Phantom with 3 Point Sources pinhole detector 360 degree acquisition AOR Co-57 parallel hole detector

  5. Pinhole Projections Over 360 Degrees Transaxial direction (u) measured predicted axial motion (v) Axial direction (V) Transaxial motion (u)

  6. Bequé’s Calibration Model (2003) The detector and object coordinate systems are not aligned y y v  z z x  x u v u

  7. slider ideal case: rigid body heavy duty rotation disk Normal ray B pinhole detector AOR AOR A possible cause A real case: flexing/rotation parallel hole detector radial movement C z0 axial movement

  8. A Model of Detector Motion v Normal Ray z f pinhole d z

  9. Extension To Bequé’s Model g=z.sin(+ξ) sinusoidal axial motion

  10. measured before and after correction predicted w/o correction predicted w/ correction axial motion

  11. Improved tracking for both pinhole & parallel hole collimators

  12. Summary • Prediction errors due to flexing gantry • Modeling of detector movement • Extension to Bequé’s calibration model • Prediction errors minimized

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