Collimator design in SPECT, an optimisation tool

Niccoló Fuin; Alexandre Bousse; Stefano Pedemonte; Simon Arridge; Sebastien Ourselin; Brian Hutton

doi:10.1109/NSSMIC.2010.5874382

Collimator design in SPECT, an optimisation tool

Niccoló Fuin^*, Alexandre Bousse, Stefano Pedemonte, Simon Arridge, Sebastien Ourselin, Brian Hutton

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

3 Citations (Scopus)

Abstract

Traditional gamma camera collimators have been based on a standard parallel design, usually with parallel holes. The collimator determines the resolution of the camera, but is also the determining factor of the number of counts detected. The uncertainty about the origin of the detected photons is modelled by a Point Spread Function (PSF), which, in literature, is normally assumed to be a Gaussian function, whose full width at half maximum (FWHM), is determined by the collimator's aperture. In this paper, these traditional assumptions will be abandoned. From related work [6] it appears possible to improve resolution recovery based reconstruction by considering different shapes of PSF. A novel collimator geometry has been then proposed, that does not imply necessarily parallel holes, but could involve a polygonal shape of the septa. To model the geometrical and septal penetration component of the point source response function a ray-tracing algorithm has been coded. In addition we developed an optimisation method that, given a target PSF, determines the optimum collimator geometry using a genetic algorithm.

Original language	English
Title of host publication	IEEE Nuclear Science Symposuim and Medical Imaging Conference, NSS/MIC 2010
Pages	3149-3154
Number of pages	6
DOIs	https://doi.org/10.1109/NSSMIC.2010.5874382
Publication status	Published - 2010
Event	2010 IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 2010 - Knoxville, TN, United States Duration: 30 Oct 2010 → 6 Nov 2010

Other

Other	2010 IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 2010
Country/Territory	United States
City	Knoxville, TN
Period	30/10/10 → 6/11/10

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title = "Collimator design in SPECT, an optimisation tool",

abstract = "Traditional gamma camera collimators have been based on a standard parallel design, usually with parallel holes. The collimator determines the resolution of the camera, but is also the determining factor of the number of counts detected. The uncertainty about the origin of the detected photons is modelled by a Point Spread Function (PSF), which, in literature, is normally assumed to be a Gaussian function, whose full width at half maximum (FWHM), is determined by the collimator's aperture. In this paper, these traditional assumptions will be abandoned. From related work [6] it appears possible to improve resolution recovery based reconstruction by considering different shapes of PSF. A novel collimator geometry has been then proposed, that does not imply necessarily parallel holes, but could involve a polygonal shape of the septa. To model the geometrical and septal penetration component of the point source response function a ray-tracing algorithm has been coded. In addition we developed an optimisation method that, given a target PSF, determines the optimum collimator geometry using a genetic algorithm.",

author = "Niccol{\'o} Fuin and Alexandre Bousse and Stefano Pedemonte and Simon Arridge and Sebastien Ourselin and Brian Hutton",

year = "2010",

doi = "10.1109/NSSMIC.2010.5874382",

language = "English",

isbn = "9781424491063",

pages = "3149--3154",

booktitle = "IEEE Nuclear Science Symposuim and Medical Imaging Conference, NSS/MIC 2010",

note = "2010 IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 2010 ; Conference date: 30-10-2010 Through 06-11-2010",

}

Fuin, N, Bousse, A, Pedemonte, S, Arridge, S, Ourselin, S & Hutton, B 2010, Collimator design in SPECT, an optimisation tool. in IEEE Nuclear Science Symposuim and Medical Imaging Conference, NSS/MIC 2010., 5874382, pp. 3149-3154, 2010 IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 2010, Knoxville, TN, United States, 30/10/10. https://doi.org/10.1109/NSSMIC.2010.5874382

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AU - Bousse, Alexandre

AU - Pedemonte, Stefano

AU - Arridge, Simon

AU - Ourselin, Sebastien

AU - Hutton, Brian

PY - 2010

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N2 - Traditional gamma camera collimators have been based on a standard parallel design, usually with parallel holes. The collimator determines the resolution of the camera, but is also the determining factor of the number of counts detected. The uncertainty about the origin of the detected photons is modelled by a Point Spread Function (PSF), which, in literature, is normally assumed to be a Gaussian function, whose full width at half maximum (FWHM), is determined by the collimator's aperture. In this paper, these traditional assumptions will be abandoned. From related work [6] it appears possible to improve resolution recovery based reconstruction by considering different shapes of PSF. A novel collimator geometry has been then proposed, that does not imply necessarily parallel holes, but could involve a polygonal shape of the septa. To model the geometrical and septal penetration component of the point source response function a ray-tracing algorithm has been coded. In addition we developed an optimisation method that, given a target PSF, determines the optimum collimator geometry using a genetic algorithm.

AB - Traditional gamma camera collimators have been based on a standard parallel design, usually with parallel holes. The collimator determines the resolution of the camera, but is also the determining factor of the number of counts detected. The uncertainty about the origin of the detected photons is modelled by a Point Spread Function (PSF), which, in literature, is normally assumed to be a Gaussian function, whose full width at half maximum (FWHM), is determined by the collimator's aperture. In this paper, these traditional assumptions will be abandoned. From related work [6] it appears possible to improve resolution recovery based reconstruction by considering different shapes of PSF. A novel collimator geometry has been then proposed, that does not imply necessarily parallel holes, but could involve a polygonal shape of the septa. To model the geometrical and septal penetration component of the point source response function a ray-tracing algorithm has been coded. In addition we developed an optimisation method that, given a target PSF, determines the optimum collimator geometry using a genetic algorithm.

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Y2 - 30 October 2010 through 6 November 2010

ER -

Collimator design in SPECT, an optimisation tool

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