Cover Imaging for Physicists

6. Image contouring

• Automatic contouring of PET image data seems to be beneficial:

objectivity, reproducibility.

• PET has low spatial resolution and high signal-to-noise ratio (SNR)

• Blurred images with partial volume effects (PVE) for small objects.

25 | D. Thorwarth | 09/2015

ESTRO teaching course on advanced imaging techniques

(A) [18F]-FDG autoradiography of a mouse leg bearing a tumour. In order to mimic the limited

spatial resolution of PET images (C), the autoradiography image in (A) was blurred with the

point-spread function of the PET system used in (C) and resampled to the same voxel size (B).

The original PET image is shown in (C).

Courtesy J. Lee, Brussels