Variable height multi-slit collimator and optimized image reconstruction in a photon-counting system for digital mammography

Autor:	Magnus Åslund, Mats Lundqvist, Björn Cederström, B. G. Svensson, Max Teleman
Rok vydání:	2011
Předmět:	Physics Nuclear and High Energy Physics Digital mammography medicine.diagnostic_test business.industry Detector Collimator Iterative reconstruction Photon counting law.invention Optics Software law Line (geometry) medicine Mammography business Instrumentation
Zdroj:	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 648:S216-S219
ISSN:	0168-9002
DOI:	10.1016/j.nima.2010.11.148
Popis:	We have investigated a pre-breast collimator able to operate at variable heights for a photon-counting scanned multi-slit mammography system. A prototype system was built and used to evaluate how different collimator heights combined with optimized collimator slit widths affect dose efficiency and scan time. Moreover, new image construction software which takes into account the sub-pixel shift of each detector line was implemented and evaluated. With maintained scan time a collimator 79 mm above patient support improved dose efficiency for a 100 mu m disc by 12% and by 22% for a scan time extended by 10%. For image reconstruction and the same disc size a dose efficiency improvement of 32% +/- 9% was measured indicating a higher gain than expected. (c) 2010 Elsevier B.V. All rights reserved.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::288828b1f7c4073374c8511d481fe605 https://doi.org/10.1016/j.nima.2010.11.148 Zobrazit plný text záznamu Full Text from ScienceDirect