Noise Properties in Helical Cone-beam CT Images

Author

Xia, Dan ; Sidky, Emil Y. ; Yu, Lifeng ; Pan, Xiaochuan

Author_Institution

Chicago Univ., IL

Volume

6

fYear

2006

fDate

Oct. 29 2006-Nov. 1 2006

Firstpage

3428

Lastpage

3430

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2006. IEEE

Conference_Location

San Diego, CA

ISSN

1095-7863

Print_ISBN

1-4244-0560-2

Electronic_ISBN

1095-7863

Type

conf

DOI

10.1109/NSSMIC.2006.353738

Filename

4179780