Image reconstruction algorithm for a rotating slat collimator.

  title={Image reconstruction algorithm for a rotating slat collimator.},
  author={Gengsheng Lawrence Zeng and Daniel Gagnon and Christopher G. Matthews and Jeffery A. Kolthammer and Jason D. Radachy and William G. Hawkins},
  journal={Medical physics},
  volume={29 7},
A slat collimator in single photon emission computed tomography consists of a set of parallel slats. As the collimator spins, the detector measures a one-dimensional projection data set. A complete data set can be obtained by rotating the detector/collimator assembly around the object (patient) while the collimator spins continuously. The measured projection data are assumed to be weighted planar integrals of the object. This paper describes the development of an approximate three-dimensional… 
Image reconstruction algorithm for a SPECT system with a convergent rotating slat collimator
In this paper, we suggest the use of a convergent rotating slat collimator in a SPECT system that contains strip-shaped CdZnTe detectors. This CdZnTe imaging device is able to provide better energy
A sparse collimator for a rotating strip SPECT camera
  • G. Zeng, D. Gagnon
  • Physics
    2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)
  • 2003
This paper suggests the use of a sparse parallel slat collimator in a rotating SPECT camera using a new design that significantly simplifies the detector's hardware and reduces the detector spinning angle from 360/spl deg/ to 180/ spl deg/ for acquiring a complete data set.
Detector Blurring and Detector Sensitivity Compensation for a Spinning Slat Collimator
  • G. Zeng
  • Mathematics
    IEEE Transactions on Nuclear Science
  • 2006
This paper extends the well-known frequency-distance relation to a rotating-spinning parallel-slat collimator SPECT system, where the projection data are in the form of weighted planar integrals and
3D RBI-EM reconstruction with spherically-symmetric basis function for SPECT rotating slat collimator.
This paper proposes a 3D RBI-EM reconstruction algorithm with spherically-symmetric basis function, also called 'blobs', for the slat collimator, which has a closed and spheric symmetric analytical expression for the 3D Radon transform, which makes it easier to compute the plane integral than the voxel.
Fast 3D image reconstruction for rotating slat collimated gamma cameras
Results indicate that the integration of two MLEM iteration loops into one can provide improved image quality regarding contrast recovery and noise and avoids determining a stopping rule for the first step in the 2-step approach.
Image reconstruction algorithm for a spinning strip CZT SPECT camera with a parallel slat collimator and small pixels.
This paper discusses the use of small pixels in a spinning CdZnTe single photon emission computed tomography (SPECT) camera that is mounted with a parallel slat collimator that has an advantage over the older design that uses tilted slats.
System characteristics of SPECT with a slat collimated strip detector.
The validity of the calculations is proven by measuring the sensitivity in the FOV of a prototype rotating slat gamma camera and it is shown that for equal collimator dimensions the same resolution-distance relationship is obtained as for parallel hole collimators.
Optimizing the acquisition time profile for a planar integral measurement system with a spinning slat collimator.
This article considers a hypothetical imaging device with a spinning slat collimator that measures parallel-planar-integral data from an object that has an optimal dwell-time profile and uses Nelder-Mead's simplex method to search for this optimal distribution of the scanning time among the data measurement locations.
Comparing planar image quality of rotating slat and parallel hole collimation: influence of system modeling.
A comparative study of image quality, achieved with system modeling, is presented and shows that cold spot imaging is slightly better for a RS collimator than a classical PHcollimator, while hot spot contrast improvement is revealed up to 54% compared to a classicalPH bone scan.


A prototype rotating slat collimator for single photon emission computed tomography
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 experimental evaluation of a prototype rotating slat collimator for planar gamma camera imaging.
Improved noise behaviour was observed for images acquired with the slat collimators compared to those acquired with a low-energy high-resolution (LEHR) collimator for small distributions of activity and improved contrast was observed in images of small hot regions.
Monte Carlo modelling of the performance of a rotating slit-collimator for improved planar gamma-camera imaging.
A rotating slit-collimator which collects one-dimensional projections from which the planar image may be reconstructed by the theory of computed tomography is proposed and it is shown that higher spatial resolution with increased sensitivity is possible with the slit- collimator.
Performance assessment of a slat gamma camera collimator for 511 keV imaging.
The results show that the slat collimator may have advantages over the parallel hole Collimator for 511 keV imaging, though the greater complexity of operation of the sl at collimators and potential sources of artefact in slatcollimator imaging are recognized.
Geometric efficiency of a rotating slit-collimator for improved planar gamma-camera imaging
Derives several expressions for the geometric efficiency of a rotating collimator, comprising a set of parallel slits, for a gamma camera. These expressions represent approximate analytic formulae
Design considerations for a new solid-state gamma-camera: Soltice
This paper presents an alternative to a conventional gamma camera. The proposed system is based on the combination of a new detection material - CZT - and a new acquisition geometry - 1D detector
The Radon Transform and Some of Its Applications
Providing basic information about the properties of radon transform, this book contains examples and documents a wide variety of applications. It offers guidance to literature related to transform,