ESTRO 2025 - Abstract Book

S2972

Physics - Image acquisition and processing

ESTRO 2025

mg/ml) but reached an error of 1 mg/ml at a concentration of 15 mg/ml, which is less than 10%. Iodine quantifications were found to be satisfactory across two scanners for both HN and brain protocols.

The HU accuracy of VNC images remained within 20 HU for both small and large iodine phantoms, irrespective of beam hardening corrections. When comparing the HU accuracy of various materials in the CTDP phantom to TPS, results were within 50 HU for mixed-energy and 75 keV images, and within 100 HU for 70 keV and 80 keV images. The CB2-50 HU (electron density = 1.47) was underestimated by 250-350 HU in 120 keV, 190 keV, and VNC images, while it was overestimated by 600 HU in 50 keV images.