Technical Program

Paper Detail

Paper:	SU-AM-PS1.6
Session:	X-Ray CT, PET and SPECT Imaging
Time:	Sunday, April 9, 10:50 - 12:10
Presentation:	Poster
Title:	A Comparative Study of Three Tomographic Reconstruction Methods in Cone Beam Off-Centered Circular Geometry
Authors:	Solene Valton; Creatis
	Françoise Peyrin; Creatis
	Dominique Sappey-Marinier; Creatis
Abstract:	The development of integrated PET/CT micro-scanners is an active research area for small animal imaging. In order to enable simultaneous acquisition, a novel off-centered circular CT cone-beam geometry was introduced. We recently proposed a generalized Feldkamp formula (a-FDK) for this geometry which produced severe CB artifacts owing to the missing projection data. In this paper, we compare three different reconstruction methods applied to the off-centered geometry and their ability to reduce CB artifacts. We consider the a-FDK, the adaptation of a shift-variant FBP method to our geometry, and an algebraic method (SART). The results show that some artifacts can be corrected with the shift-variant method and the SART to achieve good quality images in return for a time expense. However the geometrical deformations are not compensated for by these techniques.

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