Two-dimensional reconstruction algorithm of an inverse-geometry volumetric CT system

Jongduk Baek; Norbert J. Pelc

doi:10.1117/12.709027

19 March 2007 Two-dimensional reconstruction algorithm of an inverse-geometry volumetric CT system

Jongduk Baek, Norbert J. Pelc

Proceedings Volume 6510, Medical Imaging 2007: Physics of Medical Imaging; 65105M (2007) https://doi.org/10.1117/12.709027
Event: Medical Imaging, 2007, San Diego, CA, United States

Abstract

An inverse-geometry volumetric CT (IGCT) system uses a large source array opposite a smaller detector array. Conventional 2D IGCT reconstruction is performed by using gridding. We describe a 2D IGCT reconstruction algorithm without gridding. The IGCT raw data can be viewed as being composed of many fan beams, each with a detector at its focus. Each projection is undersampled but the missing samples are provided by other views. In order to get high spatial resolution, zeros are inserted between acquired projection samples in each fan beam, and reconstruction is performed using a direct fan beam reconstruction algorithm. Initial IGCT reconstruction results showed ringing artifacts caused by fact that the rho samples in the ensemble of views are not equally spaced. We present a new method for correcting the errors that reduces the artifacts to below one Hounsfield Unit

Citation Download Citation

Jongduk Baek and Norbert J. Pelc "Two-dimensional reconstruction algorithm of an inverse-geometry volumetric CT system", Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65105M (19 March 2007); https://doi.org/10.1117/12.709027

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