NDLI: Cone-beam CT sequence scan reconstruction with improved dose usage and scan coverage

Content Provider	IEEE Xplore Digital Library
Author	Grimmer, R. Berkus, T. Oelhafen, M. Kunz, P. Kachelriess, M.
Copyright Year	2009
Description	Author affiliation: Institute of Medical Physics (IMP), University of Erlangen-Nu¿rnberg, Henkestr. 91, 91052 Erlangen, Germany (Grimmer, R.; Oelhafen, M.) \|\| Varian Medical Systems, Ta¿fernstr. 7, 5405 Baden-Da¿ttwil, Switzerland (Berkus, T.; Kunz, P.; Kachelriess, M.)
Abstract	For circular cone-beam CT often one scan covers not the complete z-range of interest. If this is the case two or more circle scans are made. These sequence scans are typically reconstructed by separately reconstructing each circle scan followed by combining the resulting partial volumes. This image-based concatenation method uses only those data that are needed for each partial volume, the contribution of rays to neighboring volumes are ignored, redundancies are not used, and dose is wasted. Therefore an algorithm that uses all rays that run through a voxel by appropriately weighting the rays followed by filtered backprojection was developed and evaluated. This leads to improved dose usage and increases the overlap region of neighboring volumes, potentially leading to reduced artifacts in this region. Alternatively, our approach allows to increase the table increment between adjacent circle acquisitions, and thereby the scan coverage, without impairing image quality or increasing dose. To evaluate our method we use the geometry of the Varian OBI flat panel detector CT scanner. Simulated and measured data are processed at varying table increment values and an evaluation of image noise, spatial resolution and artifacts has been performed. The method shows good image quality on simulated phantom data as well as on clinical patient data. In this paper the algorithm demonstrates its ability to extend the z-range of sequence scans and to improve the image quality in the overlap region and turns out to be usable on devices in the clinical practice.
Starting Page	3759
Ending Page	3763
File Size	1677253
Page Count	5
File Format	PDF
ISBN	9781424439614
ISSN	10957863
DOI	10.1109/NSSMIC.2009.5401883
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image reconstruction Computed tomography Image quality Geometry Radio frequency Nuclear and plasma sciences Detectors Noise measurement Spatial resolution Performance evaluation Noise reduction Cone-beam Computed tomography (CBCT) Sequence Scan Extended z-Range
Content Type	Text
Resource Type	Article

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