Fig. 2.

Profiles obtained from the sum of the scanner to scanner (SS) projections (sum over all scanner rings). The position of the projector scanner crystals are shown in Fig. 1. Black solid line (1) is for the scanner without the insert (no attenuation). Blue solid line (2) is for the scanner with the insert (attenuated). Dotted red line (3) is the result of the attenuation correction applied to the blue line (2). In an ideal case the dotted red line (3) should follow the black one (1).