Results 181 to 190 of about 230,662 (251)
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Signal‐to‐noise ratio considerations in radiographic imaging
Medical Physics, 1983The methodology employed to calculate radiographic signal‐to‐noise ratio (SNR) for the commonly used disk‐shaped test object is reviewed. Although the “matched” aperture yields the maximum SNR, its shape is difficult to achieve experimentally. On the other hand, a circular aperture having the same size as the object is much simpler to realize.
Gary T. Barnes, Dev P. Chakraborty
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On the signal‐to‐noise ratio benefit of spiral acquisition in diffusion MRI
Magnetic Resonance in Medicine, 2020Spiral readouts combine several favorable properties that promise superior net sensitivity for diffusion imaging. The purpose of this study is to verify the signal‐to‐noise ratio (SNR) benefit of spiral acquisition in comparison with current echo‐planar ...
Yoojin Lee +6 more
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Measuring signal-to-noise ratios in MR imaging.
Radiology, 1989The signal-to-noise ratio (S/N) in magnetic resonance imagining is one of the variables that must be measured when comparing the relative performance of different techniques. Although various investigators and official groups have proposed different methods for measuring S/N, these are generally not practical for use by a physician working in a ...
D M Kramer +3 more
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Lesion detection and signal–to–noise ratio in CT images
Medical Physics, 1981This study measured observers’ ability to detect and locate focal lesions on simulated CT images. The difficulty of the detection task was manipulated by changing the difference in attenuation between the lesion and its background (contrast), the random variation in the CT values (noise) or the lesion's size.
Massimiliano Szulc +2 more
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Improving the Signal-to-Noise Ratio on Terahertz Compressive Imaging [PDF]
2020 Cross Strait Radio Science & Wireless Technology Conference (CSRSWTC), 2020 we present a compact terahertz compressive imaging utilizing the vector network analyzer base on the compressive sensing technology. To eliminate the noise from the terahertz imaging system and improve the signal-to-noise ratio of the reconstructed image, we propose a novel compressive sensing methodology, in which the Paley-Hadamard sensing matrix and
Shuxu Guo, Chungui Xing, Feng Qi
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Analytical Chemistry
Fluorescence-guided cancer surgery is of considerable current interest in bioanalytical chemistry, engineering, and medicine, but its clinical utility is still hampered by the diffusive (scattering) nature of human tissues and large variations among ...
Ziyang Wang +10 more
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Fluorescence-guided cancer surgery is of considerable current interest in bioanalytical chemistry, engineering, and medicine, but its clinical utility is still hampered by the diffusive (scattering) nature of human tissues and large variations among ...
Ziyang Wang +10 more
semanticscholar +1 more source
Improving the Signal‐to‐Noise Ratio of Seismological Datasets by Unsupervised Machine Learning
Seismological Research Letters, 2019Seismic waves that are recorded by near-surface sensors are usually disturbed by strong noise. Hence, the recorded seismic data are sometimes of poor quality; this phenomenon can be characterized as a low signal-to-noise ratio (SNR).
Yangkang Chen +3 more
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Improving the signal-to-noise ratio in incoherent imaging
2021Imaging plays an important role in our modern world. Besides limitations in terms of resolution, all imaging systems show degrading image quality with increasing noise. Hence, an important aspect of any imaging application is the achievable signal-to-noise ratio (SNR). When neglecting typical noise sources (e.g. from detectors), we are left with a very
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Signal-to-noise ratio in coded aperture imaging
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2012Abstract We present a derivation of the signal-to-noise ratio (SNR) of a cyclic difference set (CDS) based coded mask which is simpler than that given in the literature, and which applies to any distribution of flux against the mask, not just Poisson statistics as is currently the case.
Paul M. E. Shutler +2 more
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Signal-to-noise ratio in a frequency multiplexing imager
IEEE Journal of Quantum Electronics, 1983The signal-to-noise ratio ( S/N ) to be expected in a frequency multiplexing imager is calculated. It is shown that, for an ideal detector, the S/N is comparable to the two-dimensional (2D) scanning imager. For low performance detectors, the frequency multiplexing imager is noticeably better, and in limiting cases, file S/N approaches that of a BLIP ...
G. Sirat, N. Ben-Yosef
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