Affiliations: iMinds-Vision Lab, University of Antwerp, Antwerpen,
Belgium | Centrum Wiskunde � Informatica (CWI), Amsterdam, The
Netherlands
Note: [] Corresponding author: Andrei Dabravolski, iMinds-Vision Lab,
University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium. Tel.: +32
32652840; Fax: +32 32652245; E-mail: [email protected]
Abstract: BACKGROUND: In computed tomography (CT), the source-detector system
commonly rotates around the object in a circular trajectory. Such a trajectory
does not allow to exploit a detector fully when scanning elongated objects.
OBJECTIVE: Increase the spatial resolution of the reconstructed
image by optimal zooming during scanning. METHODS: A new approach is proposed, in which the full width of the
detector is exploited for every projection angle. This approach is based on the
use of prior information about the object's convex hull to move the source as
close as possible to the object, while avoiding truncation of the projections.
RESULTS: Experiments show that the proposed approach can
significantly improve reconstruction quality, producing reconstructions with
smaller errors and revealing more details in the object. CONCLUSIONS: The proposed approach can lead to more accurate
reconstructions and increased spatial resolution in the object compared to the
conventional circular trajectory.
Keywords: Acquisition geometry, adaptive zooming, computed tomography, prior information
