Spatial-Resolution Enhancement in Computed Tomography

Xiaochuan Pan, Lifeng Yu, Chien Min Kao

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We propose an approach that combines an asymmetric fan-beam configuration and a new reconstruction algorithm to enhancing spatial resolution in computed tomography (CT). The asymmetric configuration can be achieved by changing the center of rotation (COR) from the conventional symmetric configuration. It does not, however, require new detectors and X-ray source nor alter the relative geometry between the detector and the X-ray source. By effectively reducing the distance of the COR to the X-ray source, the asymmetric configuration can increase the effective sampling density in projection data without reducing the size of the field of view (FOV). The proposed algorithm, on the other hand, can reconstruct images directly from data acquired with this asymmetric configuration. We performed numerical studies to demonstrate and validate the proposed acquisition/reconstruction approach. Results in these studies confirm that the proposed approach can lead to enhanced spatial resolution in reconstructed images. The proposed acquisition/reconstruction approach may find applications in micro-CT and industrial CT in which the CORs may be changed.

Original languageEnglish (US)
Pages (from-to)246-253
Number of pages8
JournalIEEE transactions on medical imaging
Volume24
Issue number2
DOIs
StatePublished - Feb 2005

Keywords

  • Computed tomography (CT)
  • image reconstruc-
  • image resolution
  • tion

ASJC Scopus subject areas

  • Software
  • Radiological and Ultrasound Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Spatial-Resolution Enhancement in Computed Tomography'. Together they form a unique fingerprint.

  • Cite this