Improved navigator-gated motion compensation in cardiac MR using additional constraint of magnitude of motion-corrupted data

Improved navigator-gated motion compensation in cardiac MR using additional constraint of magnitude of motion-corrupted data

Background In conventional prospective respiratory navigator (NAV) acquisitions, 40-60% of the acquired data are discarded resulting in low efficiency and long scan times [1,2]. Compressed-sensing Motion Compensation (CosMo) has a shorter fixed scan time by acquiring the full inner k-space and estimating the NAV-rejected outer k-space lines [3]. Respiratory motion will mainly manifest itself as...

Residual motion compensation in ECG-gated interventional cardiac vasculature reconstruction.

Three-dimensional reconstruction of cardiac vasculature from angiographic C-arm CT (rotational angiography) data is a major challenge. Motion artefacts corrupt image quality, reducing usability for diagnosis and guidance. Many state-of-the-art approaches depend on retrospective ECG-gating of projection data for image reconstruction. A trade-off has to be made regarding the size of the ECG-gatin...

Image-based Tracking Methods - Applications to Improved Motion Compensation in Cardiac MR and Image-Guided Surgery

In this dissertation, we present our efforts in developing algorithms in three related areas: 1) unified and optimal tracking, 2) improved motion compensation in cardiovascular MR, and 3) tool tracking in image-guided surgery. With the rapid advancement in the development of tracking algorithms over the years, the choice of tracking methods for a particular application has significantly increas...

Compensation of Respiratory Motion in Cardiac Imaging

Autocorrection in MR imaging: adaptive motion correction without navigator echoes.

A technique for automatic retrospective correction of motion artifacts on magnetic resonance (MR) images was developed that uses only the raw (complex) data from the MR imager and requires no knowledge of patient motion during the acquisition. The algorithm was tested on coronal images of the rotator cuff in a series of 144 patients, and the improvements in image quality were similar to those a...