Title :
A correlation and LS-SVM based approach to mitigate motion artifacts in FDK based 3D cone-beam tomography
Author :
Bhowmik, Ujjal Kumar ; Adhami, Reza R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Alabama in Huntsville, Huntsville, AL, USA
fDate :
Aug. 30 2011-Sept. 3 2011
Abstract :
Head motion during brain CT studies can degrade the reconstructed image by introducing distortion and loss of resolution, thereby contributing to misdiagnosis of diseases. In this paper, we have proposed a correlation coefficient and Least Squares Support Vector Machines (LS-SVM) based approach to detect and mitigate motion artifacts in FDK based three-dimensional cone-beam tomography. Motion is detected using correlation between adjacent x-ray projections. Artifacts, caused by motion, are mitigated either by replacing motion corrupted projections with their counterpart 180° apart projections under certain conditions, or by estimating motion corrupted projections using LS-SVM based time series prediction. The method has been evaluated on 3D Shepp-Logan phantom. Simulation results validate our claims.
Keywords :
computerised tomography; correlation methods; image reconstruction; image resolution; least squares approximations; medical image processing; motion compensation; phantoms; support vector machines; time series; 3D Shepp-Logan phantom; FDK based 3D cone-beam tomography; LS-SVM based approach; LS-SVM based time series prediction; adjacent X-ray projections; brain CT; correlation based approach; disease misdiagnosis; head motion; least squares support vector machine based approach; motion artifacts; reconstructed image; Computed tomography; Detectors; Ellipsoids; Head; Image reconstruction; Phantoms; Three dimensional displays; FDK; LS-SVM; Motion Artifacts; Motion Detection; Three-dimensional CT; Time series prediction; Algorithms; Artifacts; Cone-Beam Computed Tomography; Imaging, Three-Dimensional; Least-Squares Analysis; Motion; Phantoms, Imaging; Rotation; Support Vector Machines;
Conference_Titel :
Engineering in Medicine and Biology Society, EMBC, 2011 Annual International Conference of the IEEE
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-4121-1
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2011.6092090
