FIG. 7.

[(a), (c), (e), (g), and (i)] Commercial CT images and [(b), (d), (f), (h), and (j)] images reconstructed off-line by an external researcher, compared in terms of [(a) and (b)] CT number accuracy, [(c) and (d)] low contrast detectability, [(e) and (f)] image noise, [(g) and (h)] high contrast resolution in axial plane, and [(i) and (j)] high contrast resolution in coronal plane. All images are based on data collected on a Siemens scanner in helical mode. Images [(a)–(h)] were acquired with ACR phantom in normal position. Images [(i) and (j)] were acquired with ACR phantom in an upright coronal position to evaluate z-axis resolution.