Format:
Online-Ressource (PDF-Datei: 28 S., 6.213 kB)
,
Ill., graph. Darst.
Edition:
[2007] Online-Ausg
Series Statement:
Preprint NLD 050
Content:
In single photon emission computed tomography (SPECT) one is interested in reconstructing the activity distribution f of some radiopharmaceutical. The data gathered suffer from attenuation due to the tissue density µ. Each imaged slice incorporates noisy sample values of the nonlinear attenuated Radon transform (formular at this place in the original abstract) Traditional theory for SPECT reconstruction treats µ as a known parameter. In practical applications, however, µ is not known, but either crudely estimated, determined in costly additional measurements or plainly neglected. We demonstrate that an approximation of both f and µ from SPECT data alone is feasible, leading to quantitatively more accurate SPECT images. The result is based on nonlinear Tikhonov regularization techniques for parameter estimation problems in differential equations combined with Gauss-Newton-CG minimization.
Note:
Online-Ausg.
Additional Edition:
Erscheint auch als Druck-Ausgabe Dicken, Volker, 1967 - Simultaneous activity and attenuation reconstruction in emission tomography Potsdam : NLD, 1998
Language:
English
URN:
urn:nbn:de:kobv:517-opus-14747
Author information:
Dicken, Volker 1967-
