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
Jongduk Baek,
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); doi: 10.1117/12.709027; https://doi.org/10.1117/12.709027
Jongduk Baek, 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);