Direct cone beam SPECT reconstruction with camera tilt.

Published

Journal Article

A filtered backprojection (FBP) algorithm is derived to perform cone beam (CB) single-photon emission computed tomography (SPECT) reconstruction with camera tilt using circular orbits. This algorithm reconstructs the tilted angle CB projection data directly by incorporating the tilt angle into it. When the tilt angle becomes zero, this algorithm reduces to that of Feldkamp. Experimentally acquired phantom studies using both a two-point source and the three-dimensional Hoffman brain phantom have been performed. The transaxial tilted cone beam brain images and profiles obtained using the new algorithm are compared with those without camera tilt. For those slices which have approximately the same distance from the detector in both tilt and non-tilt set-ups, the two transaxial reconstructions have similar profiles. The two-point source images reconstructed from this new algorithm and the tilted cone beam brain images are also compared with those reconstructed from the existing tilted cone beam algorithm which requires rebinning the projection data. These comparisons demonstrate that the new algorithm, compared with the existing tilted cone beam algorithm, can provide better image contrast and improved image resolution.

Full Text

Duke Authors

Cited Authors

  • Li, J; Jaszczak, RJ; Greer, KL; Coleman, RE; Cao, ZJ; Tsui, BM

Published Date

  • February 1993

Published In

Volume / Issue

  • 38 / 2

Start / End Page

  • 241 - 258

PubMed ID

  • 8437998

Pubmed Central ID

  • 8437998

International Standard Serial Number (ISSN)

  • 0031-9155

Digital Object Identifier (DOI)

  • 10.1088/0031-9155/38/2/003

Language

  • eng

Conference Location

  • England