Results 51 to 60 of about 230,662 (251)

Image resolution and signal-to-noise ratio requirements for MR imaging of degenerative cartilage.

open access: yesAJR. American journal of roentgenology, 1997
OBJECTIVE The purpose of this study was to determine the MR image resolution and signal-to-noise ratio (SNR) required to reveal morphologic abnormalities in degenerative cartilage.
J. Rubenstein   +3 more
semanticscholar   +1 more source

Preliminary study on the feasibility of united compressed sensing with radial acquisition as a routine method for liver dynamic contrast-enhanced examination in elderly patients with malignancy

open access: yesInsights into Imaging
Objective To explore the value of the united imaging compressed sensing with radial acquisition (uCSR) in liver dynamic contrast-enhanced examinations for elderly patients with malignancy.
Heping Deng   +5 more
doaj   +1 more source

Feeble-light ghost imaging via correlation calculation

open access: yesResults in Physics, 2023
Noise is a significant factor affecting imaging quality because it seriously reduces the detection signal-to-noise ratio (SNR), especially in feeble-light detection. In this paper, we propose a practical method to separate signal from noise background in
Wei Tan   +8 more
doaj  

Signal-to-noise, spatial resolution and information capacity of coherent diffraction imaging

open access: yesIUCrJ, 2018
It is shown that the average signal-to-noise ratio (SNR) in the three-dimensional electron-density distribution of a sample reconstructed by coherent diffractive imaging cannot exceed twice the square root of the ratio of the mean total number of ...
Timur E. Gureyev   +5 more
doaj   +1 more source

Systematic analysis of signal-to-noise ratio in bipartite ghost imaging with classical and quantum light [PDF]

open access: yes, 2011
We present a complete and exhaustive theory of signal-to-noiseratio in bipartite ghost imaging with classical (thermal) and quantum (twin beams) light.
G. Brida   +5 more
semanticscholar   +1 more source

Improving photoacoustic imaging in low signal-to-noise ratio by using spatial and polarity coherence

open access: yesPhotoacoustics, 2022
To suppress the noise and sidelobe of photoacoustic images, a method is proposed combined with spatial coherence and polarity coherence. In this method, PA signals are delayed, multiplied, then performed polarity coherence, and finally summed.
Qiuqin Mao   +4 more
doaj  

Convolutional Neural Network (CNN)-Based Fast Back Projection Imaging With Noise-Resistant Capability

open access: yesIEEE Access, 2020
We propose and demonstrate a convolutional neural network (CNN)-based fast back projection (FBP) imaging method, which has noise-resistant capability in strong noise conditions.
Guanqun Sun, Fangzheng Zhang
doaj   +1 more source

Evaluation of image Signal-to-Noise Ratio in Time-of-Flight PET [PDF]

open access: yes2011 IEEE Nuclear Science Symposium Conference Record, 2011
In PET imaging Noise Equivalent Counts (NEC) is a common image quality index, derived to be proportional to image SNR2 and used as an index of general system performance. Many studies have shown that TOF information leads to reduced noise, faster image convergence, and improved SNR.
Clementel, Enrico   +3 more
openaire   +3 more sources

The intrinsic signal-to-noise ratio in human cardiac imaging at 1.5, 3, and 4 T.

open access: yesJournal of magnetic resonance (San Diego, Calif. 1997 : Print), 1997
Cardiac imaging is inherently demanding on the signal-to-noise performance of the MR scanner and may benefit from high field strengths. However, the complex behavior of the radiofrequency field in the human body at high frequencies makes model-based ...
H. Wen   +3 more
semanticscholar   +1 more source

Improving Signal-to-Noise Ratio in Susceptibility Weighted Imaging: A Novel Multicomponent Non-Local Approach.

open access: yesPLoS ONE, 2015
In susceptibility-weighted imaging (SWI), the high resolution required to obtain a proper contrast generation leads to a reduced signal-to-noise ratio (SNR). The application of a denoising filter to produce images with higher SNR and still preserve small
Pasquale Borrelli   +7 more
doaj   +1 more source

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