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https://www.readbyqxmd.com/read/28925747/protocol-and-quality-assurance-for-carotid-imaging-in-100-000-participants-of-uk-biobank-development-and-assessment
#1
Sean Coffey, Adam J Lewandowski, Steve Garratt, Rudy Meijer, Steven Lynum, Ram Bedi, James Paterson, Mohammad Yaqub, J Alison Noble, Stefan Neubauer, Steffen E Petersen, Naomi Allen, Cathie Sudlow, Rory Collins, Paul M Matthews, Paul Leeson
Background Ultrasound imaging is able to quantify carotid arterial wall structure for the assessment of cerebral and cardiovascular disease risks. We describe a protocol and quality assurance process to enable carotid imaging at large scale that has been developed for the UK Biobank Imaging Enhancement Study of 100,000 individuals. Design An imaging protocol was developed to allow measurement of carotid intima-media thickness from the far wall of both common carotid arteries. Six quality assurance criteria were defined and a web-based interface (Intelligent Ultrasound) was developed to facilitate rapid assessment of images against each criterion...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28924574/structural-similarity-index-family-for-image-quality-assessment-in-radiological-images
#2
Gabriel Prieto Renieblas, Agustín Turrero Nogués, Alberto Muñoz González, Nieves Gómez-Leon, Eduardo Guibelalde Del Castillo
The structural similarity index (SSIM) family is a set of metrics that has demonstrated good agreement with human observers in tasks using reference images. These metrics analyze the viewing distance, edge information between the reference and the test images, changed and preserved edges, textures, and structural similarity of the images. Eight metrics based on that family are proposed. This new set of metrics, together with another eight well-known SSIM family metrics, was tested to predict human performance in some specific tasks closely related to the evaluation of radiological medical images...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28921580/integrating-prior-information-into-microwave-tomography-part-1-impact-of-detail-on-image-quality
#3
Douglas Kurrant, Anastasia Baran, Joe LoVetri, Elise Fear
PURPOSE: The authors investigate the impact that incremental increases in the level of detail of patient-specific prior information have on image quality and the convergence behavior of an inversion algorithm in the context of near-field microwave breast imaging. A methodology is presented that uses image quality measures to characterize the ability of the algorithm to reconstruct both internal structures and lesions embedded in fibroglandular tissue. The approach permits key aspects that impact the quality of reconstruction of these structures to be identified and quantified...
September 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28916508/development-of-a-whole-slide-imaging-system-on-smartphones-and-evaluation-with-frozen-section-samples
#4
Hong Yu, Feng Gao, Liren Jiang, Shuoxin Ma
BACKGROUND: The aim was to develop scalable Whole Slide Imaging (sWSI), a WSI system based on mainstream smartphones coupled with regular optical microscopes. This ultra-low-cost solution should offer diagnostic-ready imaging quality on par with standalone scanners, supporting both oil and dry objective lenses of different magnifications, and reasonably high throughput. These performance metrics should be evaluated by expert pathologists and match those of high-end scanners. OBJECTIVE: The aim was to develop scalable Whole Slide Imaging (sWSI), a whole slide imaging system based on smartphones coupled with optical microscopes...
September 15, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28915509/device-motion-indication-a-novel-image-based-tool-to-measure-relative-device-motion-during-coronary-intervention
#5
Rami Abu Fanne, Simcha Ron Meisel, Avraham Shotan, Aharon Frimerman
BACKGROUND: Movement of the stent delivery system in the coronary bed as a result of the cardiac cycle is a well-known clinical observation that usually is either underestimated or ignored. This effect may potentially jeopardize precise stent deployment. We used a novel technology to objectively measure the relative intracoronary device motion in the different coronary segments throughout the cardiac cycle. METHODS: A total of 193 patients undergoing coronary angiography were enrolled and their studies were analyzed for device movement using the SyncVision System (Philips Volcano)...
September 15, 2017: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/28913170/comparison-of-tissue-processing-methods-for-microvascular-visualization-in-axolotls
#6
Rodrigo Montoro, Renee Dickie
The vascular system, the pipeline for oxygen and nutrient delivery to tissues, is essential for vertebrate development, growth, injury repair, and regeneration. With their capacity to regenerate entire appendages throughout their lifespan, axolotls are an unparalleled model for vertebrate regeneration, but they lack many of the molecular tools that facilitate vascular imaging in other animal models. The determination of vascular metrics requires high quality image data for the discrimination of vessels from background tissue...
2017: MethodsX
https://www.readbyqxmd.com/read/28906538/nuclear-cardiology-practices-and-radiation-exposure-in-africa-results-from-the-iaea-nuclear-cardiology-protocols-study-incaps
#7
Salah E Bouyoucef, Mathew Mercuri, Thomas N Pascual, Adel H Allam, Mboyo Vangu, João V Vitola, Nathan Better, Ganesan Karthikeyan, John J Mahmarian, Madan M Rehani, Ravi Kashyap, Maurizio Dondi, Diana Paez, Andrew J Einstein
OBJECTIVE: While nuclear myocardial perfusion imaging (MPI) offers many benefits to patients with known or suspected cardiovascular disease, concerns exist regarding radiation-associated health effects. Little is known regarding MPI practice in Africa. We sought to characterise radiation doses and the use of MPI best practices that could minimise radiation in African nuclear cardiology laboratories, and compare these to practice worldwide. METHODS: Demographics and clinical characteristics were collected for a consecutive sample of 348 patients from 12 laboratories in six African countries over a one-week period from March to April 2013...
July 2017: Cardiovascular Journal of Africa
https://www.readbyqxmd.com/read/28905452/influence-of-scanning-rate-on-quality-of-afm-image-study-of-surface-statistical-metrics
#8
Dinara Sobola, Ştefan Ţălu, Shahram Solaymani, Lubomír Grmela
The purpose of this work is to study the dependence of AFM-data reliability on scanning rate. The three-dimensional (3D) surface topography of the samples with different micro-motifs is investigated. The analysis of surface metrics for estimation of artifacts from inappropriate scanning rate is presented. Fractal analysis was done by cube counting method and evaluation of statistical metrics was carrying out on the basis of AFM-data. Combination of quantitate parameters is also presented in graphs for every measurement...
September 14, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28901614/investigating-simulation-based-metrics-for-characterizing-linear-iterative-reconstruction-in-digital-breast-tomosynthesis
#9
Sean D Rose, Adrian A Sanchez, Emil Y Sidky, Xiaochuan Pan
PURPOSE: Simulation-based image quality metrics are adapted and investigated for characterizing the parameter dependences of linear iterative image reconstruction for DBT. METHODS: Three metrics based on a 2D DBT simulation are investigated: (1) a root-mean-square-error (RMSE) between the test phantom and reconstructed image, (2) a gradient RMSE where the comparison is made after taking a spatial gradient of both image and phantom, and (3) a region-of-interest (ROI) Hotelling observer (HO) for signal-known-exactly/background-known-exactly (SKE/BKE) and signal-known-exactly/background-known-statistically (SKE/BKS) detection tasks...
September 2017: Medical Physics
https://www.readbyqxmd.com/read/28894548/a-novel-algorithm-for-pet-and-mri-fusion-based-on-digital-curvelet-transform-via-extracting-lesions-on-both-images
#10
Shirin Hajeb Mohammad Alipour, Mohammad Houshyari, Ahmad Mostaar
BACKGROUND AND AIM: Merging multimodal images is a useful tool for accurate and efficient diagnosis and analysis in medical applications. The acquired data are a high-quality fused image that contains more information than an individual image. In this paper, we focus on the fusion of MRI gray scale images and PET color images. METHODS: For the fusion of MRI gray scale images and PET color images, we used lesion region extracting based on the digital Curvelet transform (DCT) method...
July 2017: Electronic Physician
https://www.readbyqxmd.com/read/28894197/a-multi-institutional-comparison-of-dynamic-contrast-enhanced-magnetic-resonance-imaging-parameter-calculations
#11
Rachel B Ger, Abdallah S R Mohamed, Musaddiq J Awan, Yao Ding, Kimberly Li, Xenia J Fave, Andrew L Beers, Brandon Driscoll, Hesham Elhalawani, David A Hormuth, Petra J van Houdt, Renjie He, Shouhao Zhou, Kelsey B Mathieu, Heng Li, Catherine Coolens, Caroline Chung, James A Bankson, Wei Huang, Jihong Wang, Vlad C Sandulache, Stephen Y Lai, Rebecca M Howell, R Jason Stafford, Thomas E Yankeelov, Uulke A van der Heide, Steven J Frank, Daniel P Barboriak, John D Hazle, Laurence E Court, Jayashree Kalpathy-Cramer, Clifton D Fuller
Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) provides quantitative metrics (e.g. K(trans), ve) via pharmacokinetic models. We tested inter-algorithm variability in these quantitative metrics with 11 published DCE-MRI algorithms, all implementing Tofts-Kermode or extended Tofts pharmacokinetic models. Digital reference objects (DROs) with known K(trans) and ve values were used to assess performance at varying noise levels. Additionally, DCE-MRI data from 15 head and neck squamous cell carcinoma patients over 3 time-points during chemoradiotherapy were used to ascertain K(trans) and ve kinetic trends across algorithms...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28887836/a-novel-method-for-quantification-of-beam-s-eye-view-tumor-tracking-performance
#12
Yue-Houng Hu, Marios Myronakis, Joerg Rottmann, Adam Wang, Daniel Morf, Daniel Shedlock, Paul Baturin, Josh Star-Lack, Ross Berbeco
PURPOSE: In-treatment imaging using an electronic portal imaging device (EPID) can be used to confirm patient and tumor positioning. Real-time tumor tracking performance using current digital megavolt (MV) imagers is hindered by poor image quality. Novel EPID designs may help to improve quantum noise response, while also preserving the high spatial resolution of the current clinical detector. Recently investigated EPID design improvements include but are not limited to multi-layer imager (MLI) architecture, thick crystalline and amorphous scintillators, and phosphor pixilation and focusing...
September 9, 2017: Medical Physics
https://www.readbyqxmd.com/read/28885095/spatial-rectal-dose-volume-metrics-predict-patient-reported-gastro-intestinal-symptoms-after-radiotherapy-for-prostate-cancer
#13
Oscar Casares-Magaz, Ludvig Paul Muren, Vitali Moiseenko, Stine E Petersen, Niclas Johan Pettersson, Morten Høyer, Joseph O Deasy, Maria Thor
BACKGROUND: Gastro-intestinal (GI) toxicity after radiotherapy (RT) for prostate cancer reduces patient's quality of life. In this study, we explored associations between spatial rectal dose/volume metrics and patient-reported GI symptoms after RT for localized prostate cancer, and compared these with those of dose-surface/volume histogram (DSH/DVH) metrics. MATERIAL AND METHODS: Dose distributions and six GI symptoms (defecation urgency/emptying difficulties/fecal leakage, ≥Grade 2, median follow-up: 3...
September 8, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28880178/adaptive-chroma-subsampling-binding-and-luma-guided-chroma-reconstruction-method-for-screen-content-images
#14
Kuo-Liang Chung, Chi-Chao Huang, Tsu-Chun Hsu
In this paper, we propose a novel adaptive chroma subsampling-binding and luma-guided (ASBLG) chroma reconstruction method for screen content images (SCIs). After receiving the decoded luma and subsampled chroma image from the decoder, a fast winner-first voting strategy is proposed to identify the used chroma subsampling scheme prior to compression. Then, the decoded luma image is subsampled as the identified subsampling scheme was performed on the chroma image such that we are able to conclude an accurate correlation between the subsampled decoded luma image and the decoded subsampled chroma image...
September 4, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28877317/association-of-white-matter-structure-with-autism-spectrum-disorder-and-attention-deficit-hyperactivity-disorder
#15
Yuta Aoki, Yuliya N Yoncheva, Bosi Chen, Tanmay Nath, Dillon Sharp, Mariana Lazar, Pablo Velasco, Michael P Milham, Adriana Di Martino
Importance: Clinical overlap between autism spectrum disorder (ASD) and attention-deficit/hyperactivity disorder (ADHD) is increasingly appreciated, but the underlying brain mechanisms remain unknown to date. Objective: To examine associations between white matter organization and 2 commonly co-occurring neurodevelopmental conditions, ASD and ADHD, through both categorical and dimensional approaches. Design, Setting, and Participants: This investigation was a cross-sectional diffusion tensor imaging (DTI) study at an outpatient academic clinical and research center, the Department of Child and Adolescent Psychiatry at New York University Langone Medical Center...
September 6, 2017: JAMA Psychiatry
https://www.readbyqxmd.com/read/28865558/impact-of-accreditation-on-quality-in-echocardiograms-a-quantitative-approach
#16
Sarina K Behera, Shea N Smith, Theresa A Tacy
BACKGROUND: Accreditation through the Intersocietal Accreditation Commission (IAC) is believed but not proven to increase quality in imaging. The goal of this study was to use quality metrics to evaluate the impact of accreditation on quality in pediatric echocardiography. METHODS: This is a retrospective study comparing quality metrics in 236 pediatric transthoracic echocardiograms in patients with congenital heart disease from (1) California Pacific Medical Center (CPMC), a community hospital, before and after IAC accreditation, and (2) the IAC-accredited Lucile Packard Children's Hospital (LPCH), an academic children's referral center, during equivalent eras...
September 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28865170/a-method-for-characterizing-and-matching-ct-image-quality-across-ct-scanners-from-different-manufacturers
#17
James Winslow, Yakun Zhang, Ehsan Samei
PURPOSE: The purpose of this study was to quantitatively characterize the fundamental aspects of image quality (IQ) associated with different computed tomography (CT) reconstruction algorithms, the resolution, noise texture, noise magnitude per dose, and use those data to devise a methodology to match IQ between different CT systems. METHODS AND MATERIALS: This study entailed a three step methodology involving (1) characterizing the noise magnitude, texture, and resolution for a CT system-reconstruction using the relationship between noise magnitude and Computed Tomography Dose Index (CTDI), noise power spectrum (NPS), and modulation transfer function (MTF), (2) developing clinically relevant strategies of weighting the differences among system-reconstructions as a means to determine the best match (3) identifying for each target system-reconstruction, system-reconstructions with matched in terms of that minimum IQ differences...
September 2, 2017: Medical Physics
https://www.readbyqxmd.com/read/28862630/insight-into-3d-micro-ct-data-exploring-segmentation-algorithms-through-performance-metrics
#18
Talita Perciano, Daniela Ushizima, Harinarayan Krishnan, Dilworth Parkinson, Natalie Larson, Daniël M Pelt, Wes Bethel, Frank Zok, James Sethian
Three-dimensional (3D) micro-tomography (µ-CT) has proven to be an important imaging modality in industry and scientific domains. Understanding the properties of material structure and behavior has produced many scientific advances. An important component of the 3D µ-CT pipeline is image partitioning (or image segmentation), a step that is used to separate various phases or components in an image. Image partitioning schemes require specific rules for different scientific fields, but a common strategy consists of devising metrics to quantify performance and accuracy...
September 1, 2017: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/28856600/esr-concept-paper-on-value-based-radiology
#19
(no author information available yet)
The European Society of Radiology (ESR) established a Working Group on Value-Based Imaging (VBI WG) in August 2016 in response to developments in European healthcare systems in general, and the trend within radiology to move from volume- to value-based practice in particular. The value-based healthcare (VBH) concept defines "value" as health outcomes achieved for patients relative to the costs of achieving them. Within this framework, value measurements start at the beginning of therapy; the whole diagnostic process is disregarded, and is considered only if it is the cause of errors or complications...
August 30, 2017: Insights Into Imaging
https://www.readbyqxmd.com/read/28856247/quantitative-image-quality-comparison-of-reduced-and-standard-dose-dual-energy-multiphase-chest-abdomen-and-pelvis-ct
#20
Mario Buty, Ziyue Xu, Aaron Wu, Mingchen Gao, Chelyse Nelson, Georgios Z Papadakis, Uygar Teomete, Haydar Celik, Baris Turkbey, Peter Choyke, Daniel J Mollura, Ulas Bagci, Les R Folio
We present a new image quality assessment method for determining whether reducing radiation dose impairs the image quality of computed tomography (CT) in qualitative and quantitative clinical analyses tasks. In this Institutional Review Board-exempt study, we conducted a review of 50 patients (male, 22; female, 28) who underwent reduced-dose CT scanning on the first follow-up after standard-dose multiphase CT scanning. Scans were for surveillance of von Hippel-Lindau disease (N = 26) and renal cell carcinoma (N = 10)...
June 2017: Tomography: a Journal for Imaging Research
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