Title :
Evaluation of image noise in fan-beam x-ray computed tomography
Author :
Wunderlich, Adam ; Noo, Frederic
Author_Institution :
Utah Center for Advanced Imaging Research, Department of Radiology, University of Utah, Salt Lake City, USA
Abstract :
We investigate the problem of evaluating noise in computed tomography images that are reconstructed from x-ray measurements collected in fan-beam geometry. For reconstruction, we use the classical direct filtered backprojection method, which acts directly on the fan-beam projections without rebinning to the parallel-beam geometry. In this context, we present an accurate and efficient method to evaluate the image noise. This method is first validated using results from Monte-Carlo simulations. Then, we illustrate its advantages through the implementation of a channelized Hotelling observer for a lesion detection task.
Keywords :
Attenuation; Computed tomography; Detectors; Geometry; Image quality; Image reconstruction; Lesions; Noise figure; Performance evaluation; X-ray imaging; Algorithms; Computer Graphics; Computer Simulation; Humans; Image Processing, Computer-Assisted; Models, Statistical; Monte Carlo Method; Reproducibility of Results; Scattering, Radiation; Sensitivity and Specificity; Time Factors; Tomography, X-Ray Computed;
Conference_Titel :
Engineering in Medicine and Biology Society, 2008. EMBS 2008. 30th Annual International Conference of the IEEE
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4244-1814-5
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2008.4649762
