Diaphragm Tracking for Respiratory Motion Compensated Cardiac C-Arm CT
نویسندگان
چکیده
Long acquisition times of several seconds lead to image artifacts in cardiac C-arm CT. While ECG gating is able to select a certain heart phase, residual artifacts are mostly caused by respiratory motion. In order to improve image quality, it is important to accurately estimate the breathing motion that occurred during image acquisition. It has been shown that diaphragmmotion is correlated to the respiration-induced motion of the heart. We present a motion estimation and compensation method based on the tracking of the diaphragm contour in projection space. The approach utilizes a 2-D quadratic curve model to estimate and track the diaphragm with sub-pixel accuracy. Based on the tracking results, we use a motion corrected triangulation algorithm to estimate the 3-D motion of the diaphragm top. The resulting signal is used to compensate for superior-inferior respiratory motion during the reconstruction.
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