Title :
Noise Properties in Helical Cone-beam CT Images
Author :
Xia, Dan ; Sidky, Emil Y. ; Yu, Lifeng ; Pan, Xiaochuan
Author_Institution :
Chicago Univ., IL
fDate :
Oct. 29 2006-Nov. 1 2006
Abstract :
Modern computed tomography (CT) scanners use helical cone-beam configurations for increasing volume coverage and yielding isotropic spatial resolution. Recently, the backprojection filtration (BPF) algorithm has been proposed for image reconstruction in helical cone-beam scans, which is able to obtain the exact reconstruction of images within a region of interest (ROI) from truncated projection data. However, little effort has been devoted to studying the response of the algorithm implementations to physical factors such as data noise. In this work, we have performed an investigation on the noise properties of the reconstructed images by use of the BPF algorithm. A semi-analytical formula has been proposed for the estimation of the image variances.
Keywords :
computerised tomography; filtering theory; image reconstruction; noise; backprojection filtration algorithm; computed tomography scanners; helical cone-beam CT images; image reconstruction; isotropic spatial resolution; noise properties; region of interest; truncated projection data; volume coverage; Band pass filters; Computed tomography; Detectors; Filtering algorithms; Filtration; Image analysis; Image reconstruction; Image segmentation; Joining processes; Spatial resolution; BPF algorithm; Helical CT; cone-beam; image reconstruction; noise properties;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2006. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-0560-2
Electronic_ISBN :
1095-7863
DOI :
10.1109/NSSMIC.2006.353738
