Paper Info
Title
Freehand SPECT reconstructions using look up tables
Abstract
Nuclear imaging is a commonly used tool in today's diagnostics and therapy planning. For interventional use however it suffers from drawbacks which limit its application. Freehand SPECT was developed to overcome these limitations and to provide 3D functional imaging during an intervention. It combines a nuclear probe with an optical tracking system to obtain its position and orientation in space synchronized with its reading. This information can be used to compute a 3D tomographic reconstruction of an activity distribution. However, as there is no fixed geometry the system matrix has to be computed on-the-fly, using ad-hoc models of the detection process. One solution for such a model is a reference look up table of previously acquired measurements of a single source at different angles and distances. In this work two look up tables with a one and four millimeter step size between the entries were acquired. Twelve datasets of a phantom with two hollow spheres filled with a solution of Tc99wm were acquired with the Freehand SPECT system. Reconstructions with the look up tables and two analytical models currently in use were performed with these datasets and compared with each other. The finely sampled look up table achieved the qualitatively best reconstructions, while one of the analytical models showed the best positional accuracy.
Year
DOI
Venue
2012
10.1117/12.911599
Proceedings of SPIE
Keywords
Field
DocType
matrices
Single-photon emission computed tomography,Computer vision,Lookup table,Tomographic reconstruction,Matrix (mathematics),Nuclear imaging,Imaging phantom,Optical tracking,Artificial intelligence,Therapy planning,Physics
Conference
Volume
ISSN
Citations 
8316
0277-786X
3
PageRank 
References 
Authors
0.58
0
6
Name
Order
Citations
PageRank
Alexander Hartl1255.77
Dzhoshkun I. Shakir2477.63
Risto Kojchev361.01
Nassir Navab46594578.60
Sibylle Ziegler575.80
Tobias Lasser69716.81