Title :
New filtered-backprojection-based algorithms for image reconstruction in fan-beam scans
Author :
Xia, Dan ; Zou, Yu ; Yu, Lifeng ; Pan, Xiaochuan
Author_Institution :
Dept. of Radiol., Chicago Univ., IL, USA
Abstract :
Fan-beam scan is a configuration widely used in clinical computed tomography (CT) because it is easy to implement and control. Filtered-backprojection (FBP)-based algorithms have been developed previously for exact reconstruction of the entire image or an ROI within the image from the data acquired in fan-beam scans. Recently, we have developed a 3D based algorithm for image reconstruction on PI-line segments in a helical cone-beam scan. In this work, we demonstrated that the 3D FBP-based algorithm indeed provided a rather general FBP-based formulation for image reconstruction. Based upon this formulation we derived new FBP-based algorithms for image reconstruction in the fan-beam scans, which can be interpreted as the special case of the helical scan. Existing algorithms corresponding to the new derived algorithms were identified. We also performed a preliminary numerical study to verify our theoretical results. The results in the work can readily be generalized to other non-circular trajectories.
Keywords :
computerised tomography; image reconstruction; medical image processing; numerical analysis; 3D FBP-based algorithm; PI-line segments; ROI; clinical computed tomography; fan-beam CT scans; filtered-backprojection-based algorithms; helical cone-beam scan; image reconstruction; noncircular trajectories; Computed tomography; Control systems; Image reconstruction; Image segmentation; Radio control; Radiology;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2004 IEEE
Print_ISBN :
0-7803-8700-7
DOI :
10.1109/NSSMIC.2004.1462769