keyword
MENU ▼
Read by QxMD icon Read
search

image quality metric

keyword
https://www.readbyqxmd.com/read/28212084/objective-quality-assessment-of-screen-content-images-by-uncertainty-weighting
#1
Yuming Fang, Jiebin Yan, Jiaying Liu, Shiqi Wang, Qiaohong Li, Zongming Guo
In this paper, we propose a novel full-reference objective quality assessment metric for screen content images (SCIs) by structure features and uncertainty weighting (SFUW). The input SCI is first divided into textual and pictorial regions. The visual quality of textual regions is estimated based on perceptual structural similarity, where the gradient information is adopted as the structural feature. To predict the visual quality of pictorial regions in SCIs, we extract the structural features and luminance features for similarity computation between the reference and distorted pictorial patches...
February 15, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28211182/accommodation-and-pupil-behaviour-of-binocularly-viewing-early-presbyopes
#2
Meznah S Almutairi, Basal H Altoaimi, Arthur Bradley
PURPOSE: To study accommodation behaviour of early presbyopes with the full suite of accommodative stimuli, and to monitor changes in spherical aberration, pupil size and image quality that accompany the accommodative response. METHODS: Using a high resolution Shack-Hartmann aberrometer, we measured refractive state as a binocularly viewed 0.30 logMAR (6/12 or 20/40) letter E was moved from 2 m to 20 cm and simultaneously monitored pupil diameter and spherical aberration for 19 subjects (mean age: 42 ± 7...
March 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28206829/validity-of-low-contrast-letter-acuity-as-a-visual-performance-outcome-measure-for-multiple-sclerosis
#3
Laura J Balcer, Jenelle Raynowska, Rachel Nolan, Steven L Galetta, Raju Kapoor, Ralph Benedict, Glenn Phillips, Nicholas LaRocca, Lynn Hudson, Richard Rudick
Low-contrast letter acuity (LCLA) has emerged as the leading outcome measure to assess visual disability in multiple sclerosis (MS) research. As visual dysfunction is one of the most common manifestations of MS, sensitive visual outcome measures are important in examining the effect of treatment. Low-contrast acuity captures visual loss not seen in high-contrast visual acuity (HCVA) measurements. These issues are addressed by the MS Outcome Assessments Consortium (MSOAC), including representatives from advocacy organizations, Food and Drug Administration (FDA), European Medicines Agency (EMA), National Institute of Neurological Disorders and Stroke (NINDS), academic institutions, and industry partners along with persons living with MS...
February 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28205306/multi-site-quality-and-variability-analysis-of-3d-fdg-pet-segmentations-based-on-phantom-and-clinical-image-data
#4
Reinhard R Beichel, Brian J Smith, Christian Bauer, Ethan J Ulrich, Payam Ahmadvand, Mikalai M Budzevich, Robert J Gillies, Dmitry Goldgof, Milan Grkovski, Ghassan Hamarneh, Qiao Huang, Paul E Kinahan, Charles M Laymon, James M Mountz, John P Muzi, Mark Muzi, Sadek Nehmeh, Matthew J Oborski, Yongqiang Tan, Binsheng Zhao, John J Sunderland, John M Buatti
PURPOSE: Radiomics utilizes a large number of image-derived features for quantifying tumor characteristics that can in turn be correlated with response and prognosis. Unfortunately, extraction and analysis of such image-based features is subject to measurement variability and bias. The challenge for radiomics is particularly acute in Positron Emission Tomography (PET) where limited resolution, a high noise component related to the limited stochastic nature of the raw data, and the wide variety of reconstruction options confound quantitative feature metrics...
February 2017: Medical Physics
https://www.readbyqxmd.com/read/28194225/net-a-new-framework-for-the-vectorization-and-examination-of-network-data
#5
Jana Lasser, Eleni Katifori
BACKGROUND: The analysis of complex networks both in general and in particular as pertaining to real biological systems has been the focus of intense scientific attention in the past and present. In this paper we introduce two tools that provide fast and efficient means for the processing and quantification of biological networks like Drosophila tracheoles or leaf venation patterns: the Network Extraction Tool (NET) to extract data and the Graph-edit-GUI (GeGUI) to visualize and modify networks...
2017: Source Code for Biology and Medicine
https://www.readbyqxmd.com/read/28193376/radiology-research-in-quality-and-safety-current-trends-and-future-needs
#6
REVIEW
Matthew E Zygmont, Jason N Itri, Andrew B Rosenkrantz, Phuong-Anh T Duong, Lori Mankowski Gettle, Mishal Mendiratta-Lala, Elena P Scali, Ronald S Winokur, Linda Probyn, Justin W Kung, Eric Bakow, Nadja Kadom
Promoting quality and safety research is now essential for radiology as reimbursement is increasingly tied to measures of quality, patient safety, efficiency, and appropriateness of imaging. This article provides an overview of key features necessary to promote successful quality improvement efforts in radiology. Emphasis is given to current trends and future opportunities for directing research. Establishing and maintaining a culture of safety is paramount to organizations wishing to improve patient care. The correct culture must be in place to support quality initiatives and create accountability for patient care...
March 2017: Academic Radiology
https://www.readbyqxmd.com/read/28192568/early-performance-in-medicaid-accountable-care-organizations-a-comparison-of-oregon-and-colorado
#7
K John McConnell, Stephanie Renfro, Benjamin K S Chan, Thomas H A Meath, Aaron Mendelson, Deborah Cohen, Jeanette Waxmonsky, Dennis McCarty, Neal Wallace, Richard C Lindrooth
Importance: Several state Medicaid reforms are under way, but the relative performance of different approaches is unclear. Objective: To compare the performance of Oregon's and Colorado's Medicaid Accountable Care Organization (ACO) models. Design, Setting, and Participants: Oregon initiated its Medicaid transformation in 2012, supported by a $1.9 billion investment from the federal government, moving most Medicaid enrollees into 16 Coordinated Care Organizations, which managed care within a global budget...
February 13, 2017: JAMA Internal Medicine
https://www.readbyqxmd.com/read/28192287/improved-image-quality-using-monolithic-scintillator-detectors-with-dual-sided-readout-in-a-whole-body-tof-pet-ring-a-simulation-study
#8
Valerio Tabacchini, Suleman Surti, Giacomo Borghi, Joel S Karp, Dennis R Schaart
We have recently built and characterized the performance of a monolithic scintillator detector based on a 32 mm  ×  32 mm  ×  22 mm LYSO:Ce crystal read out by digital silicon photomultiplier (dSiPM) arrays coupled to the crystal front and back surfaces in a dual-sided readout (DSR) configuration. The detector spatial resolution appeared to be markedly better than that of a detector consisting of the same crystal with conventional back-sided readout (BSR). Here, we aim to evaluate the influence of this difference in the detector spatial response on the quality of reconstructed images, so as to quantify the potential benefit of the DSR approach for high-resolution, whole-body time-of-flight (TOF) positron emission tomography (PET) applications...
February 13, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28186892/image-quality-assessment-using-directional-anisotropy-structure-measurement
#9
Li Ding, Hua Huang, Yu Zang
Image quality assessment models prefer an effective visual feature to perceive image quality. Structure-based image quality metrics have verified that a measure of structural information change can provide a good approximation to perceived image distortion. Furthermore, psychological studies have suggested that human beings awareness on image structures is perception-driven and the human visual system (HVS) is more sensitive to the distortion on dominant structures rather than on minor textures. Accordingly, the image distortion can be perceived well by measuring the information loss of the dominant structures...
February 8, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28186888/gamut-extension-for-cinema
#10
Syed Waqas Zamir, Javier Vazquez-Corral, Marcelo Bertalmio
Emerging display technologies are able to produce images with a much wider color gamut than those of conventional distribution gamuts for cinema and TV, creating an opportunity for the development of gamut extension algorithms (GEAs) that exploit the full color potential of these new systems. In this paper we present a novel GEA, implemented as a PDE-based optimization procedure related to visual perception models, that performs gamut extension by taking into account the analysis of distortions in hue, chroma and saturation...
February 7, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28160525/automatic-intensity-windowing-of-mammographic-images-based-on-a-perceptual-metric
#11
Alberto Albiol, Alberto Corbi, Francisco Albiol
PURPOSE: Initial auto-adjustment of the window level WL and width WW applied to mammo-graphic images. The proposed intensity windowing (IW) method is based on the maximization of the mutual information (MI) between a perceptual decomposition of the original 12-bit sources and their screen displayed 8-bit version. Besides zoom, color inversion and panning operations, IW is the most commonly performed task in daily screening and has a direct impact on diagnosis and the time involved in the process...
February 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28154827/influence-of-rotation-increments-on-imaging-performance-for-a-rotatory-dual-head-pet-system
#12
Fanzhen Meng, Xu Cao, Xuezhou Cao, Jianxun Wang, Liang Li, Xueli Chen, Shouping Zhu, Jimin Liang
For a rotatory dual-head positron emission tomography (PET) system, how to determine the rotation increments is an open problem. In this study, we simulated the characteristics of a rotatory dual-head PET system. The influences of different rotation increments were compared and analyzed. Based on this simulation, the imaging performance of a prototype system was verified. A reconstruction flowchart was proposed based on a precalculated system response matrix (SRM). The SRM made the relationships between the voxels and lines of response (LORs) fixed; therefore, we added the interpolation method into the flowchart...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28152243/self-gated-fetal-cardiac-mri-with-tiny-golden-angle-igrasp-a-feasibility-study
#13
Kostas Haris, Erik Hedström, Sebastian Bidhult, Frederik Testud, Nicos Maglaveras, Einar Heiberg, Stefan R Hansson, Håkan Arheden, Anthony H Aletras
PURPOSE: To develop and assess a technique for self-gated fetal cardiac cine magnetic resonance imaging (MRI) using tiny golden angle radial sampling combined with iGRASP (iterative Golden-angle RAdial Sparse Parallel) for accelerated acquisition based on parallel imaging and compressed sensing. MATERIALS AND METHODS: Fetal cardiac data were acquired from five volunteers in gestational week 29-37 at 1.5T using tiny golden angles for eddy currents reduction. The acquired multicoil radial projections were input to a principal component analysis-based compression stage...
February 2, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28133763/the-effects-of-patient-positioning-when-interpreting-ct-dose-metrics-a-phantom-study
#14
Rebecca M Marsh, Michael S Silosky
PURPOSE: Review of dose metrics as part of the routine evaluation of CT protocols has become commonplace and is required by the Joint Commission and the American College of Radiology for accreditation. Most CT quality assurance programs include a review of CTDIvol and/or SSDE, both of which are affected by changes in mAs and kV. mAs, and sometimes kV, are largely determined by the Tube Current Modulation (TCM) functions of the scanner. TCM, in turn, relies on localizer scans to provide an accurate estimate of patient size...
January 30, 2017: Medical Physics
https://www.readbyqxmd.com/read/28122119/size-specific-optimization-of-ct-protocols-based-on-minimum-detectability
#15
Yakun Zhang, Christopher Smitherman, Ehsan Samei
PURPOSE: To develop a comprehensive model of task-based performance of CT across a broad library of CT protocols, so that radiation dose and image quality can be optimized within a large multi-vendor clinical facility. METHODS: 80 adult CT protocols from the Duke University Medical Center were grouped into 23 protocol groups with similar acquisition characteristics. A size-based image quality phantom (Duke Mercury Phantom 2.0) was imaged using these protocol groups for a range of clinically relevant dose levels on two CT manufacturer platforms (Siemens SOMATOM Definition Flash and GE CT750 HD)...
January 25, 2017: Medical Physics
https://www.readbyqxmd.com/read/28118397/effects-of-orientation-and-anisometry-of-magnetic-resonance-imaging-acquisitions-on-diffusion-tensor-imaging-and-structural-connectomes
#16
Raúl Tudela, Emma Muñoz-Moreno, Xavier López-Gil, Guadalupe Soria
Diffusion-weighted imaging (DWI) quantifies water molecule diffusion within tissues and is becoming an increasingly used technique. However, it is very challenging as correct quantification depends on many different factors, ranging from acquisition parameters to a long pipeline of image processing. In this work, we investigated the influence of voxel geometry on diffusion analysis, comparing different acquisition orientations as well as isometric and anisometric voxels. Diffusion-weighted images of one rat brain were acquired with four different voxel geometries (one isometric and three anisometric in different directions) and three different encoding orientations (coronal, axial and sagittal)...
2017: PloS One
https://www.readbyqxmd.com/read/28117841/white-matter-changes-in-microstructure-associated-with-a-maladaptive-response-to-stress-in-rats
#17
R Magalhães, J Bourgin, F Boumezbeur, P Marques, M Bottlaender, C Poupon, B Djemaï, E Duchesnay, S Mériaux, N Sousa, T M Jay, A Cachia
In today's society, every individual is subjected to stressful stimuli with different intensities and duration. This exposure can be a key trigger in several mental illnesses greatly affecting one's quality of life. Yet not all subjects respond equally to the same stimulus and some are able to better adapt to them delaying the onset of its negative consequences. The neural specificities of this adaptation can be essential to understand the true dynamics of stress as well as to design new approaches to reduce its consequences...
January 24, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28113847/hyperspectral-image-super-resolution-via-non-negative-structured-sparse-representation
#18
Weisheng Dong, Fazuo Fu, Guangming Shi, Xun Cao, Jinjian Wu, Guangyu Li, Xin Li
Hyperspectral imaging has many applications from agriculture and astronomy to surveillance and mineralogy. However, it is often challenging to obtain High-resolution (HR) hyperspectral images using existing hyperspectral imaging techniques due to various hardware limitations. In this paper, we propose a new Hyperspectral image super-resolution method from a low-resolution (LR) image and a HR reference image of the same scene. The estimation of the HR hyperspectral image is formulated as a joint estimation of the hyperspectral dictionary and the sparse codes based on the prior knowledge of the spatialspectral sparsity of the hyperspectral image...
March 22, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28113805/a-novel-image-quality-assessment-with-globally-and-locally-consilient-visual-quality-perception
#19
Sung-Ho Bae, Munchurl Kim
Computational models for image quality assessment (IQA) have been developed by exploring effective features that are consistent with the characteristics of human visual system (HVS) for visual quality perception. In this paper, we firstly reveal that many existing features used in computational IQA methods can hardly characterize visual quality perception for local image characteristics and various distortion types. To solve this problem, we propose a new IQA method, called Structural Contrast-Quality Index (SC-QI) by adopting a structural contrast index (SCI) which can well characterize local and global visual quality perceptions for various image characteristics with structural-distortion types...
March 25, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28113508/subpixel-image-quality-assesement-syncretizing-local-subpixel-and-global-pixel-features
#20
Jin Zeng, Lu Fang, Jiahao Pang, Houqiang Li, Feng Wu
Subpixel rendering technology increases the apparent resolution of an LCD/OLED screen by exploiting the physical property that a pixel is composed of RGB individually addressable subpixels. Due to the intrinsic intercoordination between apparent luminance resolution and color fringing artifact, a common method of subpixel image assessment is subjective evaluation. In this paper, we propose a unified subpixel image quality assessment metric called SubPixel image Assessment (SPA), which syncretizes local subpixel and global pixel features...
October 5, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
keyword
keyword
115407
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"