A comparison of rotation- and blob-based system models for 3D SPECT with depth-dependent detector response.

Abstract:

:We compare two different implementations of a 3D SPECT system model for iterative reconstruction, both of which compensate for non-uniform photon attenuation and depth-dependent system response. One implementation performs fast rotation of images represented using a basis of rectangular voxels, whereas the other represents images using a basis of rotationally symmetric volume elements. In our simulations the blob-based approach was found to slightly outperform the rotation-based one in terms of the bias-variance tradeoff in the reconstructed images. Their difference can be significant, however, in terms of computational load. The rotation-based method is faster for many typical SPECT reconstruction problems, but the blob-based one can be better-suited to cases where the reconstruction algorithm needs to process one volume element at a time.

journal_name

Phys Med Biol

authors

Yendiki A,Fessler JA

doi

10.1088/0031-9155/49/11/003

subject

Has Abstract

pub_date

2004-06-07 00:00:00

pages

2157-68

issue

11

eissn

0031-9155

issn

1361-6560

journal_volume

49

pub_type

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