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Artery-wall motion due to the pulsation of the heart is often measured to evaluate mechanical properties of the arterial wall. Such motion is thought to occur only in the arterial radial direction because the main source of the motion is an increase of blood pressure. However, it has recently been reported that the artery also moves in the longitudinal direction. Therefore, a 2D motion estimator is...
This paper presents the new method to improve the coherence between the synthetic aperture radar (SAR) images for coherent change detection (CCD) by removing the fringe rate which is determined by the terrain topography and the interferometric baseline. This method performs without the information on the terrain topography and the flight path measured by the instruments such as the inertial navigation...
Methods for imaging of strain rate in the heart wall are useful techniques for the quantitative evaluation of regional myocardial function. However, a mechanism of the transitions between myocardial contraction and relaxation is unclear. Except for a method based on ECG triggering, a required high temporal resolution was realized by scanning the heart wall sparsely at the expense of the lateral spatial...
In this paper, we propose a method that recovers a smooth high-resolution image from several blurred and roughly quantized low-resolution images. For compensation of the quantization effect we introduce a measurement of smoothness originally used for suppression of block noises in a JPEG compressed image [Schultz & Stevenson '94]. With a simple operator that approximates to the convex projection...
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