Adaptation of a Fast 3D PET Reconstruction Algorithm to an Inverse-Geometry CT System

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NETL
IEEE

外文摘要：Inverse-geometry CT (IGCT) is a new type of volumetric CT geometry。 Volumetric coverage and high isotropic resolution demand a fast 3D reconstruction algorithm。 The purpose of this work is to evaluate a very fast algorithm based on Defrise''s Fourier Rebinning (FORE) algorithm for PET。 IGCT employs a large array of focal spots opposite a detector array that shares the same axial extent as the source but is much smaller in the transverse direction。 A single rotation is sufficient to acquire a 10 cm thick volume with isotropic resolution。 A 3D reconstruction algorithm was developed based on FORE。 For comparison， a Feldkamp-like algorithm was developed that generates an average of Feldkamp reconstructions from each source row。 Projection data for a numerical torso phantom and a numerical "Defrise" phantom were simulated under the IGCT geometry。 To evaluate the FORE algorithm on a real data set， a prototype IGCT system was assembled involving a 100times100 scanned-anode source array and a 48times48 photon-counting detector array mounted on a C-arm system (NovaRay， Inc。， Palo Alto， CA)。 An anthropomorphic phantom containing a real porcine heart was scanned in a step-and-shoot mode with the C-arm in a horizontal orientation。 The FORE algorithm averaged 30 sec/slice while Feldkamp averaged 30 min/slice。 Like Feldkamp， FORE suffers from cone-beam blurring in z， however it does not suffer from cone-beam streaking artifacts。 FORE proved to be both fast and reasonably accurate。

外文关键词：

computerised tomographyimage reconstructionmedical image processingphantomsphoton countingpositron emission tomography3D reconstruction algorithmC-arm systemFORE algorithmFeldkamp reconstructionFourier rebinning algorithmIGCT geometryanthropom

作者：

S.R. Mazin、N.J. Pelc

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作者单位：

NovaRay, Inc., Palo Alto, CA

页码：

2268-2275

DOI：

10.1109/NSSMIC.2006.354366