A prototype rotating slat collimator for single photon emission computed tomography

Martin Lodge, Steve Webb, Maggie A. Flower, David M. Binnie

Research output: Contribution to journalArticle

Abstract

A collimator consisting of a series of highly attenuating parallel slats has been constructed and used in conjunction with a gamma-camera to approximately measure planar projections of a given radionuclide distribution. The enlarged solid angle of acceptance afforded by the slat collimator gave rise to an increased geometric efficiency of between 12 and 28 times that observed with a low-energy high-resolution (LEHR) parallelhole collimator. When the slats rotated over the face of the detector and the camera gantry turned about the object, sufficient projections were acquired to reconstruct a three-dimensional (3-D) image using the inversion of the 3-D radon transform. The noise behavior of an algorithm for implementing this inversion was studied analytically and the resulting relationship has been verified by computer simulation. The substantially improved geometric efficiency of the slat collimator translated to improvements in reconstructed signal-to-noise ratio (SNR) by, at best, up to a factor of 2.0 with respect to standard parallel-hole collimation. The spatial resolution achieved with the slat collimator was comparable to that obtained with a LEHR collimator and no signiflcant differences were observed in terms of scatter response. Accurate image quantification was hindered by the spatiallyvariant response of the slat collimator.

Original languageEnglish (US)
Pages (from-to)500-511
Number of pages12
JournalIEEE Transactions on Medical Imaging
Volume15
Issue number4
DOIs
StatePublished - 1996
Externally publishedYes

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Single photon emission computed tomography
Radon
Gamma Cameras
Three-Dimensional Imaging
Signal-To-Noise Ratio
Single-Photon Emission-Computed Tomography
Radioisotopes
Computer Simulation
Noise
Cameras
Signal to noise ratio
Detectors
Computer simulation

ASJC Scopus subject areas

  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology
  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Computational Theory and Mathematics

Cite this

A prototype rotating slat collimator for single photon emission computed tomography. / Lodge, Martin; Webb, Steve; Flower, Maggie A.; Binnie, David M.

In: IEEE Transactions on Medical Imaging, Vol. 15, No. 4, 1996, p. 500-511.

Research output: Contribution to journalArticle

Lodge, Martin ; Webb, Steve ; Flower, Maggie A. ; Binnie, David M. / A prototype rotating slat collimator for single photon emission computed tomography. In: IEEE Transactions on Medical Imaging. 1996 ; Vol. 15, No. 4. pp. 500-511.
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