Application of the Karhunen-Loeve transform to 4D reconstruction of cardiac gated SPECT images

Citation
Mv. Narayanan et al., Application of the Karhunen-Loeve transform to 4D reconstruction of cardiac gated SPECT images, IEEE NUCL S, 46(4), 1999, pp. 1001-1008
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Nuclear Emgineering
Journal title
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
ISSN journal
00189499 → ACNP
Volume
46
Issue
4
Year of publication
1999
Part
2
Pages
1001 - 1008
Database
ISI
SICI code
0018-9499(199908)46:4<1001:AOTKTT>2.0.ZU;2-L
Abstract
Reconstruction of gated SPECT images is intrinsically a four-dimensional pr oblem. Gated SPECT studies are normally reconstructed frame by frame; thus, the time frames are treated independently. This approach fails to exploit the strong signal correlations among the time frames which are critical for noise reduction and resolution recovery. We investigated two reconstructio n approaches, developed for dynamic PET by Wernick et al., which utilize th e compression and decorrelation properties of the Karhunen-Loeve (KL) trans form. In Method I, we temporally filter the data by using only the first fe w KL components, then perform frame-by-frame reconstruction. In Method II, we KL transform the projection data, reconstruct only the significant KL co mponent images, then perform an inverse KL transformation to obtain the ful l 4D image sequence. Results indicate that Methods I and II provide better noise performance than ordinary frame-by-frame reconstruction. Additionally , Method II requires substantially fewer computations than conventional rec onstruction methods.