Cover Imaging for Physicists

3b. PET image reconstruction

• Standard reconstruction today: Iterative methods (eg. OSEM).

• Iterative methods are characterized by:

Number of iterations and subsets

Matrix and voxel size

Image zoom

Smoothing kernel

• Sufficient number of iterations and subsets is important to ensure a

convergence of the algorithm (product larger than 40).

• Full 3D reconstruction without Fourier rebinning

• PET image reconstruction with and without attenuation correction

to check for artifacts due to contrast agents, metal implants and

patient motion.

17 | D. Thorwarth | 09/2015

ESTRO teaching course on advanced imaging techniques