Results 221 to 230 of about 87,415 (264)
Some of the next articles are maybe not open access.
Progress in coherent diffraction imaging: ptychography and coherent modulation imaging
Infrared and Laser Engineering, 2019Coherent diffraction imaging(CDI) is a lensless computational imaging technique, which reconstructs the amplitude and phase of an object directly from diffraction intensity measurement by solving the phase problem using iterative algorithms. CDI can provide images at the diffraction limit resolution that is only determined by the wavelength of ...
张福才 Zhang Fucai +5 more
openaire +1 more source
Coherent compounding in doppler imaging
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2015Coherent compounding can provide high frame rates and wide regions of interest for imaging of blood flow. However, motion will cause out-of-phase summation, potentially causing image degradation. In this work the impact of blood motion on SNR and the accuracy of Doppler velocity estimates are investigated.
Ingvild K, Ekroll +4 more
openaire +2 more sources
Statistics of the contrast of coherent images
Journal of the Optical Society of America A, 2004Contrast optimization, also known as image sharpening, is a method that can be used to estimate phase errors in coherent images. However, the contrast measure of a coherent image is a random variable because of the speckle present in coherent images. The variance of this measure puts a limit on the ability of contrast optimization to focus an image. We
S A, Fortune, M P, Hayes, P T, Gough
openaire +2 more sources
Fresnel Coherent Diffractive Imaging
Physical Review Letters, 2006We present an x-ray coherent diffractive imaging experiment utilizing a nonplanar incident wave and demonstrate success by reconstructing a nonperiodic gold sample at 24 nm resolution. Favorable effects of the curved beam illumination are identified.
Williams, G. J. +7 more
openaire +3 more sources
Dynamic sample imaging in coherent diffractive imaging
Optics Letters, 2011As the resolution in coherent diffractive imaging improves, interexposure and intraexposure sample dynamics, such as motion, degrade the quality of the reconstructed image. Selecting data sets that include only exposures where tolerably little motion has occurred is an inefficient use of time and flux, especially when detector readout time is ...
Jesse N, Clark +7 more
openaire +2 more sources
Molecular Imaging in Oncology: Current Impact and Future Directions
Ca-A Cancer Journal for Clinicians, 2022Martin G. Pomper, Steven P Rowe
exaly