The influence of inter-crystal scattering on detection efficiency of dedicated breast gamma camera

dc.contributor.author	Rasouli, Mahmoud	en
dc.contributor.author	Ay, Mohammadreza	en
dc.contributor.author	Takavar, Abbas	en
dc.contributor.author	Lashkari, Sarah	en
dc.contributor.author	Λούντος, Γεώργιος	el
dc.date.accessioned	2015-06-07T15:42:13Z
dc.date.available	2015-06-07T15:42:13Z
dc.date.issued	2015-06-07
dc.identifier.uri	http://hdl.handle.net/11400/15478
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.source	http://link.springer.com/chapter/10.1007%2F978-3-540-89208-3_588	el
dc.subject	Dedicated Gamma Camera
dc.subject	Detection efficiency
dc.subject	Απόδοση ανίχνευσης
dc.subject	ICS
dc.subject	Misidentification fraction
dc.subject	Κλάσμα εσφαλμένης ταυτοποίησης
dc.subject	PDA
dc.title	The influence of inter-crystal scattering on detection efficiency of dedicated breast gamma camera	en
heal.type	conferenceItem
heal.secondaryTitle	a monte carlo study	en
heal.classification	Medicine
heal.classification	Medical technology
heal.classification	Ιατρική
heal.classification	Ιατρική τεχνολογία
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh00006614
heal.classificationURI	http://zbw.eu/stw/descriptor/18252-4
heal.classificationURI	N/A-Ιατρική
heal.classificationURI	N/A-Ιατρική τεχνολογία
heal.identifier.secondary	DOI: 10.1007/978-3-540-89208-3_588
heal.language	en
heal.access	campus
heal.publicationDate	2008-11
heal.bibliographicCitation	Rasouli, M., Ay, M., Takavar, A., Lashkari, S. and Loudos, G. (2008). The influence of inter-crystal scattering on detection efficiency of dedicated breast gamma camera: a monte carlo study. In Proceedings of 4th European Conference of the International Federation for Medical and Biological Engineering (ECIFMBE) 2008. Antwerp, Belgium. 23-27 November 2008. pp 2451-2454. Available from: http://link.springer.com/chapter/10.1007%2F978-3-540-89208-3_588.	en
heal.abstract	Dedicated gamma cameras based on Photodiodes coupled to pixellated small size scintillators, is suitable for high resolution imaging such as small animal and breast cancer imaging. It is well known that inter-crystal scattering (ICS) is of the major resolution degradation factors in the system with small crystal size. The aim of this study is to quantitatively calculate the ICS events in different types of crystal material (CsI, NaI and LaBr3) and size (0.5×0.5, 1×1, 1.5×1.5 and 3×3 mm2) using Monte Carlo simulation. The simulations were designed to optimize camera design particularly for crystal pixel size and scintillation material. Three types of scintillation crystal were exposed by 140 keV photons of a point source as a pencil beam in orthogonal and oblique incidences. In oblique incidence, detected events in central pixel of crystal array decreased in small angles slowly and then decreased rapidly by increasing of incidence angle. In orthogonal incidence in four different pixel sizes, the percentage of photons encounters the ICS event in CsI crystal was 1.82%, 3.76%, 4.94% and 6.49% events for 3×3, 1.5×1.5, 1×1 and 0.5×0.5 mm2 crystal pixel size respectively, that were less than NaI and LaBr3 crystals. Also in the oblique incidence, in all pixel sizes of CsI crystal the photons encountered ICS events were less than NaI and LaBr3. According to our results, The CsI crystal from the point of view of higher detection efficiency and position detection accuracy (PDA) and lower ICS is preferable. However, the optimal crystal material and size for high resolution breast imaging are still open questions which require further research and development efforts.	en
heal.fullTextAvailability	true
heal.conferenceName	4th European Conference of the International Federation for Medical and Biological Engineering IFMBE Proceedings	en
heal.conferenceItemType	full paper