This paper is a summary discourse on the real time navigator approach to suppressing motion effects in coronary magnetic resonance angiography. The concept of navigator approach, characteristics of coronary motion, design of navigator echoes for motion measurements, and navigator algorithms for motion effects suppression are reviewed and discussed. At the conclusion, an efficient and effective ...

Characterizing respiratory-induced tumour motion is an important step in the effective image-guided radiation treatment of moving tumours, especially for tumours in the lung and lower abdomen. This study characterized tumour motion based on a piecewise linear model representing tumour motion at defined stages of the breathing cycle. Lung tumour locations were categorized based on broncho-pulmon...

In this contribution, we present an algorithm for lowcomplexity global motion estimation, that works with block-coded video (e.g. MPEG-2). A superimposed global motion model is fitted to decoded P-frame motion vector fields, providing real-time performance. Therefore a robust M-estimator is applied since a lot of outliers have to be expected in the motion vector fields. The algorithm is compare...

Estimation of the dynamic characteristics of buildings is a key issue in seismic design technology. Since 1957, the Building Research Institute (BRI), Japan, has been operating a network to monitor strong motion in buildings. In this study, dynamic characteristics of 25 actual buildings in the BRI network were estimated by using strong motion records. Acceleration records from two sensors respe...

In the sac-driven artificial heart, the flow characteristics are coupled to the dynamics of the sac motion. The opening dynamics of the sac wall can, for example, strongly affect the chamber flow characteristics during diastole by directing or impeding the inflow. Poor sac motion can reduce the volume output of the pump and may increase the potential for thrombus formation within the ventricula...

We used the Pulfrich effect to investigate perception of motion in depth. Independent manipulation of spatial and temporal frequency content in stereoscopic motion stimuli revealed the tuning characteristics of motion-in-depth perception. Sensitivity to interocular phase difference between sinusoidally oscillating sine-wave gratings was measured in four observers who judged direction of motion ...

CONTEXT The magnitude of motion that is normal for the throwing shoulder in uninjured baseball pitchers has not been established. Chronologic factors contributing to adaptations in motion present in the thrower's shoulder also have not been established. OBJECTIVES To develop a normative profile of glenohumeral rotation motion in uninjured high school baseball pitchers and to evaluate the effe...