Effect of oblique X-ray incidence in flat-panel computed tomography of the Breast
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hdl:2117/9572
Tipus de documentArticle
Data publicació2009
Condicions d'accésAccés obert
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Abstract
We quantify the variation in resolution due to
anisotropy caused by oblique X-ray incidence in indirect flat-panel
detectors for computed tomography breast imaging systems. We
consider a geometry and detector type utilized in breast computed
tomography (CT) systems currently being developed. Our
methods rely on MANTIS, a combined X-ray, electron, and optical
Monte Carlo transport open source code. The physics models
are the most accurate available in general-purpose Monte Carlo
packages in the diagnostic energy range. We consider maximum-
obliquity angles of 10 and 13 at the centers of the 30 and
40 cm detector edges, respectively, and 16 at the corner of the
detector. Our results indicate that blur is asymmetric and that the
resolution properties vary significantly with the angle (or location)
of incidence. Our results suggest that the asymmetry can be as
high as a factor of 2.6 between orthogonal directions. Anisotropy
maps predicted by MANTIS provide an understanding of the effect
that such variations have on the imaging system and allow more
accurate modeling and optimization of breast CT systems. These
maps of anisotropy across the detector could lead to improved
reconstruction and help motivate physics-based strategies for
computer detection of breast lesions.
CitacióBadano, A. [et al.]. Effect of oblique X-ray incidence in flat-panel computed tomography of the Breast. "IEEE transactions on medical imaging", 2009, vol. 28, núm. 5, p. 696-702.
ISSN0278-0062
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badano2009IEEETransMedImag28p696_CTbreast.pdf | 1,067Mb | Visualitza/Obre |