Background Free-breathing whole heart coronary MRA uses diaphragm navigator to gate data acquisition, which suffers from the need for time-consuming and exquisite positioning, prolonged scan time due to low gating efficiency, and inaccuracy in motion detection. In this work, a respiratory motion correction scheme is proposed with an affine motion model for accurate estimation of respiratory mot...

Background Respiratory motion remains a major impediment in a substantial amount of patients undergoing coronary magnetic resonance angiography (CMRA). Studies in healthy subjects have shown that image-based navigation (iNAV) improves respiratory motion compensation compared to the state-of-the art method. Here, we used iNAV for respiratory motion compensated CMRA in 22 patients with known or s...

Respiratory motion causes artifacts in slow-rotating cone-beam (CB) computed tomography (CT) images acquired for example for image guidance of radiotherapy. Respiration-correlated CBCT has been proposed to correct for the respiratory motion, but the use of a subset of the CB projections to reconstruct each frame of the 4D CBCT image limits their quality, thus requiring a longer acquisition time...

Compensating for respiratory motion is a key challenge for stereotactic body radiation therapy. To overcome latencies in the systems, prediction of future motion is necessary. This is related to the assumption of a stable correlation between external and internal motion. We present a new application for on-line model checking to introduce fail-safety to respiratory motion prediction and show it...

Positron Emission Tomography (PET) is a nuclear imaging technique of increasing importance e.g. in cardiovascular investigations. However, cardiac and respiratory motion of the patient degrade the image quality due to acquisition times in the order of minutes. Reconstructions without motion compensation are prone to spatial blurring and affected attenuation correction. These effects can be redu...

Introduction: Over past decades, several respiratory motion compensation techniques have been studied [1]. Prospective navigator (NAV) is the most commonly used technique to monitor respiratory motion. NAV results in an increase in acquisition time (2-3×) to allow for re-sampling of motion-corrupted k-space lines. Compressed-sensing (CS) for motion compensation has been previously demonstrated ...

In this paper a novel anatomic-like phantom, to simulate human respiratory motion is presented. The phantom is capable to simulate thorax and abdomen motion for surface based respiratory gating systems. This phantom is used to evaluate a system based on time-of-flight (TOF) technology, to detect respiratory motion. It could be shown that the correlation between the reference motion, performed b...