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Imaging

Imaging. PET. Course Layout. Talk Layout. Repetition of PET princinples PET image reconstruction -FBP Physics of NMR Application to imaging of NMR -MRI. PET. Positron emission. PET. 5a. 5b. 4. 1. 2. 3. Coincidence Events. 1. Detected True Coincidence Event.

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Imaging

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  1. Imaging PET

  2. Course Layout

  3. Talk Layout • Repetition of PET princinples • PET image reconstruction -FBP • Physics of NMR • Application to imaging of NMR -MRI

  4. PET

  5. Positron emission

  6. PET

  7. 5a 5b 4 1 2 3 Coincidence Events 1. Detected True Coincidence Event 2. True Event Lost to Sensitivity or Deadtime 3. True Event Lost to Photon Attenuation 4. Scattered Coincidence Event 5a,b. Random Coincidence Event

  8. Attenuation Correction

  9. Filtered Back Projection

  10. Filtered Back Projection

  11. Filtered Back Projection

  12. Filtered backprojection • Filter the measured projection data at different projection • angles with a special function. • Backproject the filtered projection data to form the • reconstructed image. • Filtering can be implemented in 2 ways, in the spatial domain, the filter operation is • equivalent to to convolving the measured projection data using a special convolving • function h(t) • More efficient multiplication will be in the spatial frequency domain. • FFT the measured projection data into the frequency domain: • p(,)=FT {p(t, ) • Multiply the the fourier transform projections with the special function. • Inverse Fourier transform the product p’(,).

  13. 2D Vs. 3D

  14. Randoms

  15. Scatters

  16. Principles of MRI

  17. Felix Bloch

  18. Atoms

  19. Spins

  20. Precession

  21. RF pulse

  22. T1 and T2

  23. T1 and T2

  24. T1 and T2

  25. Effect of tissue

  26. Slice selection

  27. K space

  28. K Space

  29. NMR

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