Skip to main content
Journal cover image

Three-dimensional SPECT reconstruction of combined cone beam and parallel beam data.

Publication ,  Journal Article
Jaszczak, RJ; Li, J; Wang, H; Coleman, RE
Published in: Phys Med Biol
March 1992

Single photon emission computed tomography (SPECT) using cone beam (CB) collimation exhibits increased sensitivity compared with acquisition geometries using parallel (P) hole collimation. However, CB collimation has a smaller field-of-view which may result in truncated projections and image artifacts. A primary objective of this work is to investigate maximum likelihood-expectation maximization (ML-EM) methods to reconstruct simultaneously acquired parallel and cone beam (P&CB) SPECT data. Simultaneous P&CB acquisition can be performed with commercially available triple camera systems by using two cone-beam collimators and a single parallel-hole collimator. The loss in overall sensitivity (relative to the use of three CB collimators) is about 15 to 20%. We have developed three methods to combine P&CB data using modified ML-EM algorithms. The first method consists of using both data sets to reconstruct a single intermediate image after each iteration using the ML-EM algorithm. The other two iterative algorithms combine intermediate parallel beam (PB) and CB source estimates to enhance image quality. For these methods, a PB estimate and a CB estimate are obtained for the first iteration. The second method consists of summing the PB and CB estimates for each subsequent iteration to obtain new PB and CB estimates. The third method is similar to the second method, with the exception that the new PB estimate simply is set equal to the PB estimate after each iteration. The combined source estimate is used in each subsequent iteration step of the EM algorithm. These algorithms are evaluated using projection data simulated using a Monte Carlo SPECT model. The P&CB SPECT images demonstrate marked improvement as compared with the CB-only reconstruction, particularly when the projections are truncated.

Duke Scholars

Altmetric Attention Stats
Dimensions Citation Stats

Published In

Phys Med Biol

DOI

ISSN

0031-9155

Publication Date

March 1992

Volume

37

Issue

3

Start / End Page

535 / 548

Location

England

Related Subject Headings

  • Tomography, Emission-Computed, Single-Photon
  • Nuclear Medicine & Medical Imaging
  • Models, Structural
  • Image Processing, Computer-Assisted
  • Artifacts
  • Algorithms
  • 5105 Medical and biological physics
  • 1103 Clinical Sciences
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Jaszczak, R. J., Li, J., Wang, H., & Coleman, R. E. (1992). Three-dimensional SPECT reconstruction of combined cone beam and parallel beam data. Phys Med Biol, 37(3), 535–548. https://doi.org/10.1088/0031-9155/37/3/003
Jaszczak, R. J., J. Li, H. Wang, and R. E. Coleman. “Three-dimensional SPECT reconstruction of combined cone beam and parallel beam data.Phys Med Biol 37, no. 3 (March 1992): 535–48. https://doi.org/10.1088/0031-9155/37/3/003.
Jaszczak RJ, Li J, Wang H, Coleman RE. Three-dimensional SPECT reconstruction of combined cone beam and parallel beam data. Phys Med Biol. 1992 Mar;37(3):535–48.
Jaszczak, R. J., et al. “Three-dimensional SPECT reconstruction of combined cone beam and parallel beam data.Phys Med Biol, vol. 37, no. 3, Mar. 1992, pp. 535–48. Pubmed, doi:10.1088/0031-9155/37/3/003.
Jaszczak RJ, Li J, Wang H, Coleman RE. Three-dimensional SPECT reconstruction of combined cone beam and parallel beam data. Phys Med Biol. 1992 Mar;37(3):535–548.
Journal cover image

Published In

Phys Med Biol

DOI

ISSN

0031-9155

Publication Date

March 1992

Volume

37

Issue

3

Start / End Page

535 / 548

Location

England

Related Subject Headings

  • Tomography, Emission-Computed, Single-Photon
  • Nuclear Medicine & Medical Imaging
  • Models, Structural
  • Image Processing, Computer-Assisted
  • Artifacts
  • Algorithms
  • 5105 Medical and biological physics
  • 1103 Clinical Sciences
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences