Title :
An anylytical inversion of the 180° Exponential Radon Transform with a numerical kernel
Author :
Huang, Qiu ; Zeng, Gengsheng L. ; Gullberg, Grant T.
Author_Institution :
Utah Center for Adv. Imaging Res., Utah Univ., Salt Lake City, UT
fDate :
Oct. 29 2006-Nov. 1 2006
Abstract :
This work presents an inversion algorithm for the exponential Radon transform (ERT) over 180deg range of view angles. The algorithm can be applied to two-dimensional parallel beam geometry in single photon emission computed tomography. First the differentiation of the ERT over pi is backprojected. A convolutional relation between this backprojected differentiation and the original image is then established. In order to invert the convolution relation, the least-squares method is utilized to obtain a numerically generated filtering kernel, which readily restores the original image. The advantages of the proposed algorithm are, first, it only requires half the view angles of the conventional inversion algorithm, second, it deals with truncation in ERT data in certain situations, and third, the numerically generated filtering kernel can be pre-calculated and stored for later applications. The algorithm is an analytical approach except for the pre-calculated inverse kernel.
Keywords :
Radon transforms; single photon emission computed tomography; 2D parallel beam geometry; exponential Radon transform; filtering kernel; inverse kernel; least-squares method; single photon emission computed tomography; Attenuation; Biomedical imaging; Brain; Computational geometry; Computed tomography; Filtering algorithms; Image reconstruction; Kernel; Single photon emission computed tomography; X-ray imaging;
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.2006.356464