Comparison of analytical and algebraic 2D tomographic reconstruction approaches for irregularly sampled microCT data.
APD-based detectors with individual channel readout were developed for multi-crystal applications and have been implemented for the detection of annihilation radiation in the LabPET micro-scanner. The use of these APD-based detectors in X-ray imaging is currently being assessed with a microCT demonstrator in order to later combine PET and CT in one apparatus. This paper is focused on the tomographic reconstruction of the X-ray transmission data acquired with this demonstrator. Two aspects of the acquisition geometry need to be carefully considered: the radius of the detector arc and the irregular sampling of the detector bins. A specific shift-variant filtered backprojection formula derived to account for the detector curvature is applied to equiangularly resampled projection data while the simultaneous algebraic reconstruction technique is applied to both resampled and original projections. Images of physical phantoms reconstructed from measured projections using the different methods are presented and compared.
Valton
Solène
S
CREATIS, UMR CNRS 5220, U630 INSERM, INSA-Lyon, Université Claude Bernard-Lyon 1, F69621 Villeurbanne, France.
Bérard
Philippe
P
Riendeau
Joel
J
Thibaudeau
Christian
C
Lecomte
Roger
R
Sappey-Marinier
Dominique
D
Peyrin
Françoise
F
D011857:Radiographic Image Interpretation, Computer-Assisted; D014057:Tomography, X-Ray Computed / Q000379:methods*