Motion compensation

Details Motion compensation Motion compensation

2005-02-23

2009-12-08

Azarian, Seyed (Department: 2624)

Image analysis

Applications

Biomedical applications

C382S275000, C378S004000

Reexamination Certificate

active

07630528

ABSTRACT:
Using only projection data in one temporal gating window around a certain target phase point may lead to motion artifacts such as blurred images. By using projection data corresponding to three temporal gating windows, which are slightly shifted with respect to each other but at least partially overlap, motion within the gating window may be estimated and, according to an exemplary embodiment of the present invention, this estimation may be used for improving the image quality. Advantageously, only the projection data inside the at least partially overlapping gating windows are used for reconstruction and motion compensation.

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Taguchi, K.; Temporal resolution and the evaluation of candidate algorithms for four-dimensional CT; 2003; Med. Phys.; 30(4)640-650.Abstract.
Dhanantwari, A.C., et al.; Adaptive Processing to Correct for Organ Motion Artifacts in X-Ray CT Medical Imaging Systems; 2000; IEEE-Sensor Array and Multichannel Signal Processing Workshop; pp. 261-265.
Grass, M., et al.; Helical cardiac cone beam reconstruction using retrospective ECG gating; 2003; Phys. Med. Biol.; 48:3069-3084.
Mair, B.A., et al.; Simultaneous Motion Estimation and Image Reconstruction From Gated Data; 2002; IEEE-Biomedical Imaging Symposium; pp. 661-664.
Ritchie, C.J., et al.; Correction of Computed Tomography Motion Artifacts Using Pixel-Specific Back-Projection; 1996; IEEE Trans. on Medical Imaging; 15(3)333-342.
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Taguchi, K.; Temporal resolution and the evaluation of candidate algorithms for four-dimensional CT; 2003; Med. Phys.; 30(4)640-650.Abstract.

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