Physics and Radiobiology of Nuclear Medicine

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Single Photon Emission Computed Tomography 167

Estimated
image

Calculated
projections
of estimated
image

Compare A & B projections Measured

Reconstructed
image

Correct for
differences

Create new
estimated image

Initial
guess

Unfold
projections

A B

Maximum
agreement

Discrepancy

Fig. 12.12. Conceptual scheme of iterative reconstruction.

C

qi


j

Fig. 12.13. A projection qiin the estimated image is the sum of counts in all pixels
Cjand is compared with the measured projection pi.

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