Title :
Motion-compensated reconstruction of tomographic image sequences
Author :
Gravier, Erwan J. ; Yang, Yongyi
Author_Institution :
Dept. of Electr. & Comput. Eng., Illinois Inst. of Technol., Chicago, IL, USA
Abstract :
In this paper we study a motion-compensated approach for simultaneous reconstruction of image frames in a time sequence. We treat the frames in a sequence collectively as a single function of both space and time, and define a temporal prior to account for the temporal correlations in a sequence. This temporal prior is defined in a form of motion-compensation, aimed to follow the curved trajectories of the object motion through space-time. The image frames are then obtained through estimation using the expectation-maximization (EM) algorithm. The proposed algorithm was evaluated using the 4D gated mathematical cardiac-torso (gMCAT) D1.01 phantom to simulate gated SPECT perfusion imaging with Tc99m. Our experimental results demonstrate that the use of motion compensation for reconstruction can lead to significant improvement in image quality and reconstruction accuracy.
Keywords :
cardiology; haemorheology; image reconstruction; image resolution; image sequences; medical computing; motion compensation; phantoms; single photon emission computed tomography; spatiotemporal phenomena; technetium; 4D gated mathematical cardiac-torso D1.01 phantom; Tc99m; curved trajectories; expectation-maximization algorithm; gMCAT; gated SPECT perfusion imaging; image frames; image quality; motion-compensated reconstruction; object motion; simultaneous reconstruction; space-time; temporal correlations; time sequence; tomographic image sequences; Biomedical imaging; Image quality; Image reconstruction; Image sequences; Imaging phantoms; Medical simulation; Motion compensation; Motion estimation; Noise reduction; Positron emission tomography;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2003 IEEE
Print_ISBN :
0-7803-8257-9
DOI :
10.1109/NSSMIC.2003.1352496