Open Access
ARTICLE
A Retrospective Respiratory Gating System Based on Epipolar Consistency Conditions
Maosen Lian1, Yi Li1, Xiaohui Gu1, Shouhua Luo1,*
1 School of Biological Science and Medical Engineering, Southeast University, NanJing, China
* Corresponding Author: Shouhua Luo. Email:
Molecular & Cellular Biomechanics 2020, 17(1), 41-48. https://doi.org/10.32604/mcb.2019.07383
Abstract
Motion artifacts of in vivo imaging, due to rapid respiration rate and
respiration displacements of the mice while free-breathing, is a major challenge in
micro computed tomography(micro-CT). The respiratory gating is often served for
either projective images acquisition or per projection qualification, so as to
eliminate the artifacts brought by
in vivo motion. In this paper, we propose a novel
respiratory gating method, which firstly divides one rotation cycle into a number
of segments, and extracts the respiratory signal from the projective image series
of current segment by the value of the epipolar consistency conditions (ECC), then
in terms of the measured average respiratory period, sets next segment’s start-up
time and rotation speed of the gantry for respiratory phase synchronization, and so
on so forth. The gating procedure is through the whole projections of three cycles,
only one among three projections at each angle is qualified by their phase value
and is retained for future use for tomographic image reconstruction. In practical
experiment, the ECC based gating method and the conventional hardware gating
method are employed on micro CT imaging of C57BL/6 mice respectively. The
result shows that, compared with the hardware based one, the proposed method
not only achieve much better consistency in the projection images, but also
suppresses the streak artifacts more effectively on the different parts like the breast,
abdomen and head of
in vivo mice.
Keywords
Cite This Article
Lian, M., Li, Y., Gu, X., Luo, S. (2020). A Retrospective Respiratory Gating System Based on Epipolar Consistency Conditions.
Molecular & Cellular Biomechanics, 17(1), 41–48. https://doi.org/10.32604/mcb.2019.07383