Three-Dimensional Iterative Reconstruction Algorithms With Attenuation And Geometric Point Response Correction

G. L. Zeng, G. T. Gullberg, Benjamin Tsui, J. A. Terry

Research output: Contribution to journalArticle

Abstract

The point response resolution of a gamma camera deteriorates with increased distance from the face of the collimator. This results in reconstruction artifacts that are seen as shape distortion and density non-uniformity. For parallel, fan, and cone beam geometries, iterative reconstruction algorithms have been developed which eliminate these artifacts by incorporating the three-dimensional spatially varying geometric point response into models for the projection and backprojection operations which also model photon attenuation. The algorithms have been tested on an IBM 3090-600S supercomputer. The iterative EM reconstruction algorithm is 50 times longer with geometric response and photon attenuation models than without modeling these physical effects. We have demonstrated an improvement in image quality in the reconstruction of projection data collected from a single photon emission computed tomography (SPECT) imaging system. Using phantom experiments, we observe that the modeling of the spatial system response imposes a smoothing without loss of resolution.

Original languageEnglish (US)
Pages (from-to)693-702
Number of pages10
JournalIEEE Transactions on Nuclear Science
Volume38
Issue number2
DOIs
StatePublished - 1991
Externally publishedYes

Fingerprint

attenuation
Photons
Single photon emission computed tomography
artifacts
photons
Supercomputers
projection
Imaging systems
supercomputers
Image quality
Fans
Cones
collimators
Cameras
fans
smoothing
nonuniformity
cones
Geometry
tomography

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering
  • Nuclear and High Energy Physics

Cite this

Three-Dimensional Iterative Reconstruction Algorithms With Attenuation And Geometric Point Response Correction. / Zeng, G. L.; Gullberg, G. T.; Tsui, Benjamin; Terry, J. A.

In: IEEE Transactions on Nuclear Science, Vol. 38, No. 2, 1991, p. 693-702.

Research output: Contribution to journalArticle

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