Title :
Local tomography in fan-beam geometry using wavelets
Author :
Rashid-Farrokhi, F. ; Liu, K.J.R. ; Berenstein, C.A.
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
Abstract :
An algorithm is developed for wavelet based multiresolution reconstruction of a function directly from its fan beam projections. The algorithm uses the locality of wavelet and scaling functions to reconstruct a local region of interest with reduced exposure. In other words, our algorithm saves the radiation exposure in the cases where only a local region of the cross section of a body is to be reconstructed. For example, in order to reconstruct a region of 16 pixels in radius in a 256×255 image, our method can reduce the X-ray dosage down to 22% of full exposure
Keywords :
diagnostic radiography; dosimetry; image reconstruction; image resolution; medical image processing; wavelet transforms; 256 pixel; 256×255 image; 65536 pixel; X-ray dosage; algorithm; cross section; fan-beam geometry; local region; local tomography; radiation exposure; scaling functions; wavelet based multiresolution reconstruction; Character generation; Educational institutions; Filters; Fourier transforms; Geometry; Image reconstruction; Image sampling; Interpolation; Tomography; Wavelet transforms;
Conference_Titel :
Image Processing, 1996. Proceedings., International Conference on
Conference_Location :
Lausanne
Print_ISBN :
0-7803-3259-8
DOI :
10.1109/ICIP.1996.560977
