Journal ArticleDOI
A study of the point spread function in scintillation camera collimators based on Fourier analysis.
S. Miracle,M.J. Yzuel,S. Millán +2 more
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TLDR
The collimator function is developed into a Fourier series and the intensity distribution in the detector plane for a point source is given by a mathematical expression that depends on the object position and on the collimators parameters.Abstract:
A new technique for evaluating the point spread function of parallel hole collimators in scintillation cameras is studied. The collimator function is developed into a Fourier series and the intensity distribution in the detector plane for a point source is given by a mathematical expression that depends on the object position and on the collimator parameters. The septal penetration effect is considered. The technique is applied to obtain the general formulae for collimators with hexagonal holes and the PSF is evaluated.read more
Citations
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Journal ArticleDOI
Three-dimensional iterative reconstruction algorithms with attenuation and geometric point response correction
TL;DR: In this article, a three-dimensional iterative reconstruction algorithm which incorporates models of the geometric point response in the projector-backprojector is presented for parallel, fan, and cone beam geometries.
Journal ArticleDOI
The geometric transfer function for cone and fan beam collimators
TL;DR: The theoretical formulation was used to design a fan beam collimator for SPECT imaging and was shown to agree well with the experimental results.
Journal ArticleDOI
A comparison of deconvolution and windowed subtraction techniques for scatter compensation in SPECT
TL;DR: Results of applying these procedures to data obtained from a phantom containing cold cylinders and to data from a cold spot-resolution phantom are presented and are shown to be superior to the results of correcting for scatter by scatter-window substraction.
Journal ArticleDOI
Geometrical response of multihole collimators
TL;DR: This theory allows the definition of accurate models of the geometrical response for SPECT reconstruction and it is suitable for designing new collimators.
Journal ArticleDOI
Projection-space methods to take into account Finite Beam-width Effects in Two-dimensional Tomography Algorithms
TL;DR: In this article, it is shown that the full three-dimensional imaging properties of the detection system, including filter functions, can be described in projection space, and two methods to compensate for most of the beam-width effects have been developed, which can be combined with many tomography algorithms.
References
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Journal Article
Scintillation Camera with Multichannel Collimators
TL;DR: The scintillation camera is a sensitive electronic instrument for taking pie tures of the distribution of gamma-ray and positron-emitting isotopes in vivo, and the optimum collimation method should be used.
Journal ArticleDOI
Septal penetration in scintillation camera collimators
Gerd Muehllehner,H Luig +1 more
TL;DR: A computer program was written and is described which determines the line spread function by tracing a large number of rays through the collimator by taking into account differences in hole shape and septal penetration.
Journal ArticleDOI
The design of multichannel collimators for radioisotope cameras
TL;DR: Two methods of design of multi-cylindrical-channel collimators for radioisotope cameras are described and the results indicate that, although the efficiency is reasonably constant, the resolution increases approximately linearly with distance.
Journal ArticleDOI
A computer method for calculation of the point source response of a focusing collimator.
TL;DR: A digital computer is used with a ray tracing technique to calculate the response of a multihole focusing collimator to a point source of radiation placed anywhere in the object space.