RT Conference Proceedings
T1 Complete Scheme for Beam Hardening Correction in Small Animal Computed Tomography
A1 Molina, Claudia de
A1 Sisniega, Alejandro
A1 Desco Menéndez, Manuel
A1 Vaquero López, Juan José
A1 Abella García, Mónica
AB CT images are often affected by beam hardening artifacts (cupping and dark streaks) due to the polyenergetic nature of the X-ray beam. FDK is still the favorite reconstruction algorithm in commercial X-ray CT scanners. Several correction methods have been proposed to be included in an FDK reconstruction scheme. We present a complete correction scheme for beam hardening artifact correction in an FDK based reconstruction scenario that accounts for both cupping artifact and dark streaks avoiding the need of the knowledge of the source spectrum. The proposed correction scheme includes two steps: a linearization step of projection data and a post-reconstruction step. The first step assumes that the object is homogeneous and uses a linearization function that is calculated empirically in a previous calibration process with a simple phantom. The second step is based in the theoretical study described in Joseph and Spital, and calculates the non-linear beam-hardening distortion from a bone segmentation of the reconstructed image. The proposed correction scheme was evaluated in real studies acquired with a cone-beam micro-CT scanner: three polymethylmethacrylate cylinders (3, 4, and 6 cm diameter), a two-density cylindrical phantom and three rodent studies. Results show an average cupping reduction of 84 % in the three homogeneous phantoms and an average dark streaks reduction of 80 % in the two-density phantom and the three rodent studies. The proposed method could be incorporated easily in any cone beam micro-CT scanner and substitutes the need of the knowledge of the spectrum by empirical measurements and two parameters. Since it is based on empirical measurements, we expected to correct the artifacts derived from scattering.
PB Ieee - The Institute Of Electrical And Electronics Engineers, Inc
SN 978-1-4673-2028-3
SN 1082-3654
YR 2012
FD 2012
LK https://hdl.handle.net/10016/20278
UL https://hdl.handle.net/10016/20278
LA eng
NO Proceedings of: 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC). Anaheim, California, USA. October 29 - November 3, 2012
NO This work was supported in part by projects TEC2008-06715 and TEC2007-64731 (Ministerio de Ciencia e Innovaci6n), EU-FP7 FMTXCT-201792, ARTEMIS S2009/DPI-1802 (Comunidad de Madrid), and European Regional Development Funds (FEDER) and CDTI under the CENIT program (AMIT project, CEN-20101014).
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RD 17 jul. 2024