keyword
MENU ▼
Read by QxMD icon Read
search

McCollough effect

keyword
https://www.readbyqxmd.com/read/28714714/no-evidence-for-enhancements-to-visual-working-memory-with-transcranial-direct-current-stimulation-to-prefrontal-or-posterior-parietal-cortices
#1
Matthew K Robison, William P McGuirk, Nash Unsworth
The present study examined the relative contributions of the prefrontal cortex (PFC) and posterior parietal cortex (PPC) to visual working memory. Evidence from a number of different techniques has led to the theory that the PFC controls access to working memory (i.e., filtering), determining which information is encoded and maintained for later use whereas the parietal cortex determines how much information is held at 1 given time, regardless of relevance (i.e., capacity; McNab & Klingberg, 2008; Vogel, McCollough, & Machizawa, 2005)...
August 2017: Behavioral Neuroscience
https://www.readbyqxmd.com/read/28607666/synesthesia-and-the-mccollough-effect
#2
V S Ramachandran, Zeve Marcus
Synesthetes, who see printed black letters and numbers as being colored, are thought to have enhanced cross-activation between brain modules for color and form. Since the McCollough effect also results from oriented contours (i.e., form) evoking specific colors, we conjectured that synesthetes may experience an enhanced McCollough effect, and find that this is indeed true.
May 2017: I-Perception
https://www.readbyqxmd.com/read/28495641/safety-and-efficacy-of-infliximab-therapy-in-the-setting-of-steroid-refractory-acute-graft-versus-host-disease
#3
Fevzi F Yalniz, Mehrdad Hefazi, Kristen McCullough, Mark R Litzow, William J Hogan, Robert Wolf, Hassan Alkhateeb, Ankit Kansagra, Moussab Damlaj, Mrinal M Patnaik
Acute graft-versus-host disease (aGVHD) is the leading cause of morbidity and mortality after allogenic hematopoietic cell transplantation (HCT). Corticosteroids are the first-line treatment; however, less than one-half of patients achieve durable remission. Studies suggest that TNF-α, a cytokine released from the bone marrow during conditioning, is involved in the pathogenesis of aGVHD. We retrospectively evaluated the outcome of anti-TNF-α therapy with infliximab in 35 patients with steroid refractory (SR) aGVHD...
May 8, 2017: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/28413240/detection-of-increased-vasa-vasorum-in-artery-walls-improving-ct-number-accuracy-using-image-deconvolution
#4
Kishore Rajendran, Shuai Leng, Steven M Jorgensen, Dilbar Abdurakhimova, Erik L Ritman, Cynthia H McCollough
Changes in arterial wall perfusion are an indicator of early atherosclerosis. This is characterized by an increased spatial density of vasa vasorum (VV), the micro-vessels that supply oxygen and nutrients to the arterial wall. Detection of increased VV during contrast-enhanced computed tomography (CT) imaging is limited due to contamination from blooming effect from the contrast-enhanced lumen. We report the application of an image deconvolution technique using a measured system point-spread function, on CT data obtained from a photon-counting CT system to reduce blooming and to improve the CT number accuracy of arterial wall, which enhances detection of increased VV...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28241103/technical-note-insertion-of-digital-lesions-in-the-projection-domain-for-dual-source-dual-energy-ct
#5
Andrea Ferrero, Baiyu Chen, Zhoubo Li, Lifeng Yu, Cynthia McCollough
PURPOSE: To compare algorithms performing material decomposition and classification in dual-energy CT, it is desirable to know the ground truth of the lesion to be analyzed in real patient data. In this work, we developed and validated a framework to insert digital lesions of arbitrary chemical composition into patient projection data acquired on a dual-source, dual-energy CT system. METHODS: A model that takes into account beam-hardening effects was developed to predict the CT number of objects with known chemical composition...
May 2017: Medical Physics
https://www.readbyqxmd.com/read/28236645/an-effective-noise-reduction-method-for-multi-energy-ct-images-that-exploit-spatio-spectral-features
#6
Zhoubo Li, Shuai Leng, Lifeng Yu, Armando Manduca, Cynthia H McCollough
PURPOSE: To develop and evaluate an image-domain noise reduction method for multi-energy CT (MECT) data. METHODS: Multi-Energy Non-Local Means (MENLM) is a technique that uses the redundant information in MECT images to achieve noise reduction. In this method, spatio-spectral features are used to determine the similarity between pixels, making the similarity evaluation more robust to image noise. The performance of this MENLM filter was tested on images acquired on a whole-body research photon counting CT system...
May 2017: Medical Physics
https://www.readbyqxmd.com/read/28048229/su-g-iep2-15-virtual-insertion-of-digital-kidney-stones-into-dual-source-dual-energy-ct-projection-data
#7
A Ferrero, B Chen, A Huang, J Montoya, L Yu, C McCollough
PURPOSE: In order to investigate novel methods to more accurately estimate the mineral composition of kidney stones using dual energy CT, it is desirable to be able to combine digital stones of known composition with actual phantom and patient scan data. In this work, we developed and validated a method to insert digital kidney stones into projection data acquired on a dual-source, dual-energy CT system. METHODS: Attenuation properties of stones of different mineral composition were computed using tabulated mass attenuation coefficients, the chemical formula for each stone type, and the effective beam energy at each evaluated tube potential...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047384/su-f-j-75-accuracy-and-stability-of-electron-density-measurements-across-patient-size-using-dual-energy-ct
#8
G Michalak, A Halaweish, B Krauss, J Fletcher, C McCollough
PURPOSE: Dual energy (DE) CT can be used to characterize tissue composition. One application of DE CT is to measure electron density (ED, rho) and atomic number (Z) for use in radiation therapy treatment planning. This work evaluated the accuracy and stability of ED estimation as patient size varied for both single-energy (SE) and DE CT. METHODS: An ED phantom (CIRS) and four torso-shaped water tanks (lateral widths 15, 25, 35 and 45 cm) containing 8 tissue-simulating cylinders of known ED were scanned on a dual-source CT system (Siemens Somatom Force) in SE (120 kV) and DE (90/150Sn) modes...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28042589/dose-efficient-ultrahigh-resolution-scan-mode-using-a-photon-counting-detector-computed-tomography-system
#9
Shuai Leng, Zhicong Yu, Ahmed Halaweish, Steffen Kappler, Katharina Hahn, Andre Henning, Zhoubo Li, John Lane, David L Levin, Steven Jorgensen, Erik Ritman, Cynthia McCollough
An ultrahigh-resolution (UHR) data collection mode was enabled on a whole-body, research photon counting detector (PCD) computed tomography system. In this mode, 64 rows of [Formula: see text] detector pixels were used, which corresponded to a pixel size of [Formula: see text] at the isocenter. Spatial resolution and image noise were quantitatively assessed for the UHR PCD scan mode, as well as for a commercially available UHR scan mode that uses an energy-integrating detector (EID) and a set of comb filters to decrease the effective detector size...
October 2016: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28025654/subjective-and-objective-heterogeneity-scores-for-differentiating-small-renal-masses-using-contrast-enhanced-ct
#10
Shuai Leng, Naoki Takahashi, Daniel Gomez Cardona, Kazuhiro Kitajima, Brian McCollough, Zhoubo Li, Akira Kawashima, Bradley C Leibovich, Cynthia H McCollough
PURPOSE: The aim of this study was to assess the effect of denoising on objective heterogeneity scores and its diagnostic capability for the diagnosis of angiomyolipoma (AML) and renal cell carcinoma (RCC). MATERIALS AND METHODS: A total of 158 resected renal masses ≤4 cm [98 clear cell (cc) RCCs, 36 papillary (pap)-RCCs, and 24 AMLs] from 139 patients were evaluated. A representative contrast-enhanced computed tomography (CT) image for each mass was selected by a genitourinary radiologist...
May 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/27795606/evaluation-of-a-photon-counting-medipix3rx-czt-spectral-x-ray-detector
#11
Steven M Jorgensen, Andrew J Vercnocke, David S Rundle, Philip H Butler, Cynthia H McCollough, Erik L Ritman
We assessed the performance of a cadmium zinc telluride (CZT)-based Medipix3RX x-ray detector as a candidate for micro-computed tomography (micro-CT) imaging. This technology was developed at CERN for the Large Hadron Collider. It features an array of 128 by 128, 110 micrometer square pixels, each with eight simultaneous threshold counters, five of which utilize real-time charge summing, significantly reducing the charge sharing between contiguous pixels. Pixel response curves were created by imaging a range of x-ray intensities by varying x-ray tube current and by varying the exposure time with fixed x-ray current...
August 28, 2016: Proceedings of SPIE
https://www.readbyqxmd.com/read/27583789/maternal-obesity-in-pregnancy-developmentally-programs-adipose-tissue-inflammation-in-young-lean-male-mice-offspring
#12
Maria Z Alfaradhi, Laura C Kusinski, Denise S Fernandez-Twinn, Lucas C Pantaleão, Sarah K Carr, David Ferland-McCollough, Giles S H Yeo, Martin Bushell, Susan E Ozanne
Obesity during pregnancy has a long-term effect on the health of the offspring including risk of developing the metabolic syndrome. Using a mouse model of maternal diet-induced obesity, we employed a genome-wide approach to investigate the microRNA (miRNA) and miRNA transcription profile in adipose tissue to understand mechanisms through which this occurs. Male offspring of diet-induced obese mothers, fed a control diet from weaning, showed no differences in body weight or adiposity at 8 weeks of age. However, offspring from the obese dams had up-regulated cytokine (Tnfα; P < ...
November 2016: Endocrinology
https://www.readbyqxmd.com/read/27096399/how-low-can-we-go-in-radiation-dose-for-the-data-completion-scan-on-a-research-whole-body-photon-counting-computed-tomography-system
#13
Zhicong Yu, Shuai Leng, Zhoubo Li, Ahmed F Halaweish, Steffen Kappler, Erik L Ritman, Cynthia H McCollough
PURPOSE: A research photon-counting computed tomography (CT) system that consists of an energy-integrating detector (EID) and a photon-counting detector (PCD) was installed in our laboratory. The scanning fields of view of the EID and PCD at the isocenter are 500 and 275 mm, respectively. When objects are larger than the PCD scanning field of view, a data-completion scan (DCS) using the EID subsystem is needed to avoid truncation artifacts in PCD images. The goals of this work were to (1) find the impact of a DCS on noise of PCD images and (2) determine the lowest possible dose for a DCS such that truncation artifacts are negligible in PCD images...
July 2016: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/26835839/evaluation-of-conventional-imaging-performance-in-a-research-whole-body-ct-system-with-a-photon-counting-detector-array
#14
Zhicong Yu, Shuai Leng, Steven M Jorgensen, Zhoubo Li, Ralf Gutjahr, Baiyu Chen, Ahmed F Halaweish, Steffen Kappler, Lifeng Yu, Erik L Ritman, Cynthia H McCollough
This study evaluated the conventional imaging performance of a research whole-body photon-counting CT system and investigated its feasibility for imaging using clinically realistic levels of x-ray photon flux. This research system was built on the platform of a 2nd generation dual-source CT system: one source coupled to an energy integrating detector (EID) and the other coupled to a photon-counting detector (PCD). Phantom studies were conducted to measure CT number accuracy and uniformity for water, CT number energy dependency for high-Z materials, spatial resolution, noise, and contrast-to-noise ratio...
February 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/26632058/lesion-insertion-in-the-projection-domain-methods-and-initial-results
#15
Baiyu Chen, Shuai Leng, Lifeng Yu, Zhicong Yu, Chi Ma, Cynthia McCollough
PURPOSE: To perform task-based image quality assessment in CT, it is desirable to have a large number of realistic patient images with known diagnostic truth. One effective way of achieving this objective is to create hybrid images that combine patient images with inserted lesions. Because conventional hybrid images generated in the image domain fails to reflect the impact of scan and reconstruction parameters on lesion appearance, this study explored a projection-domain approach. METHODS: Lesions were segmented from patient images and forward projected to acquire lesion projections...
December 2015: Medical Physics
https://www.readbyqxmd.com/read/26429276/the-influence-of-focal-spot-blooming-on-high-contrast-spatial-resolution-in-ct-imaging
#16
Joshua Grimes, Xinhui Duan, Lifeng Yu, Ahmed F Halaweish, Nicole Haag, Shuai Leng, Cynthia McCollough
PURPOSE: The objective of this work was to investigate focal spot blooming effects on the spatial resolution of CT images and to evaluate an x-ray tube that uses dynamic focal spot control for minimizing focal spot blooming. METHODS: The influence of increasing tube current at a fixed tube potential of 80 kV on high-contrast spatial resolution of seven different CT scanner models (scanners A-G), including one scanner that uses dynamic focal spot control to reduce focal spot blooming (scanner A), was evaluated...
October 2015: Medical Physics
https://www.readbyqxmd.com/read/26264031/neural-adaptation-effects-in-conceptual-processing
#17
Barbara F M Marino, Anna M Borghi, Luca Gemmi, Cristina Cacciari, Lucia Riggio
We investigated the conceptual processing of nouns referring to objects characterized by a highly typical color and orientation. We used a go/no-go task in which we asked participants to categorize each noun as referring or not to natural entities (e.g., animals) after a selective adaptation of color-edge neurons in the posterior LV4 region of the visual cortex was induced by means of a McCollough effect procedure. This manipulation affected categorization: the green-vertical adaptation led to slower responses than the green-horizontal adaptation, regardless of the specific color and orientation of the to-be-categorized noun...
2015: Behavioral Sciences
https://www.readbyqxmd.com/read/26204304/radiation-dose-reduction-in-dual-energy-ct-does-it-affect-the-accuracy-of-urinary-stone-characterization
#18
Mingliang Qu, Lifeng Yu, Daniel Gomez Cardona, Yu Liu, Xinhui Duan, Songtao Ai, Shuai Leng, Maria Shiung, Cynthia H McCollough
OBJECTIVE: The purpose of this article is to assess the effect of radiation dose reduction in dual-energy CT (DECT) on the performance of renal stone characterization using a patient cohort. MATERIALS AND METHODS: CT data from 39 unenhanced DECT examinations performed for stone characterization were retrospectively analyzed in this study. Reduced-dose images were simulated at 75%, 50%, and 25% of the routine dose using a previously validated noise-insertion algorithm...
August 2015: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/26146445/lesion-insertion-in-projection-domain-for-computed-tomography-image-quality-assessment
#19
Baiyu Chen, Zhicong Yu, Shuai Leng, Lifeng Yu, Cynthia McCollough
To perform task-based image quality assessment in CT, it is desirable to have a large number of realistic patient images with known diagnostic truth. One effective way to achieve this objective is to create hybrid images that combine patient images with simulated lesions. Because conventional hybrid images generated in the image-domain fails to reflect the impact of scan and reconstruction parameters on lesion appearance, this study explored a projection-domain approach. Liver lesion models were forward projected according to the geometry of a commercial CT scanner to acquire lesion projections...
February 21, 2015: Proceedings of SPIE
https://www.readbyqxmd.com/read/26128987/tu-ef-204-01-accurate-prediction-of-ct-tube-current-modulation-estimating-tube-current-modulation-schemes-for-voxelized-patient-models-used-in-monte-carlo-simulations
#20
K McMillan, M Bostani, C McCollough, M McNitt-Gray
PURPOSE: Most patient models used in Monte Carlo-based estimates of CT dose, including computational phantoms, do not have tube current modulation (TCM) data associated with them. While not a problem for fixed tube current simulations, this is a limitation when modeling the effects of TCM. Therefore, the purpose of this work was to develop and validate methods to estimate TCM schemes for any voxelized patient model. METHODS: For 10 patients who received clinically-indicated chest (n=5) and abdomen/pelvis (n=5) scans on a Siemens CT scanner, both CT localizer radiograph ("topogram") and image data were collected...
June 2015: Medical Physics
keyword
keyword
53412
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"