Collimators calculation for a single slice SPECT system

Gantet, Pierre; Danet, B.; Esquerré, J. P.; Guiraud, R.

doi:10.1088/0031-9155/35/1/003

Cited by 4 publications

(1 citation statement)

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“…For conventional parallel-hole collimators, the hole length can differ from one manufacturer to another, although the spatial resolution specified at 10 cm is identical. Optimal relations between hole length, diameter and septum thickness have been discussed by Gunter (1996) and Gantet et al (1990) and are not within the scope of this paper. For subsequent analysis, we have selected two collimators with minimum hole lengths of 25 mm and 40 mm respectively.…”

Section: Optimal Design Considerationsmentioning

confidence: 99%

Optimal design of planar-concave collimators for SPECT - an analytical approach

Kimiaei

Larsson²

1998

Phys. Med. Biol.

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In this paper we present an analytical tool for the design and optimization of planar-concave collimators for SPECT. We conclude that a single general planar-concave collimator that eliminates the non-isotropic blurring for all SPECT applications does not exist. On the other hand, it is possible to achieve pseudo-optimal collimators for different clinical applications by a careful choice of the design parameters. By classifying the clinical applications into two groups, for instance body and brain studies, the non-isotropic blurring for most SPECT situations may be dramatically reduced by means of planar-concave collimators. The results based on Monte Carlo simulations show that the shape of the point source response function of the reconstructed image obtained from the planar-concave collimator is more isotropic than that obtained from a conventional parallel-hole collimator. Specifically, the ratio of the FWHM of the reconstructed point response function in the radial and tangential direction is increased from 0.5 for the parallel-hole to 0.85 for the planar-concave collimator for sources 200 mm away from the centre of rotation.

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Section: Optimal Design Considerationsmentioning

confidence: 99%

Optimal design of planar-concave collimators for SPECT - an analytical approach

Kimiaei

Larsson²

1998

Phys. Med. Biol.

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A simulation method for studying scintillation camera collimators

Gantet¹,

Esquerré²,

Danet³

et al. 1990

Phys. Med. Biol.

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This paper presents a computer simulation of photon interaction with collimator septa, which allows the point spread function of scintillation camera collimators to be calculated. The method simulates photon attenuation along their propagation direction in a determinist way. Using this simulation, the spatial resolution, geometric efficiency and penetration index of collimators may be easily assessed. Results obtained with this method are presented and compared with those obtained from standard formulae. We show the usefulness of the simulation which precisely accounts for effects of septum penetration. Measurements performed on two collimators with 131I and 99Tcm point sources provide results consistent with those obtained from the simulation method. In conclusion we show that this method is an accurate tool to assist conception of collimators for nuclear medicine.

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