keyword
MENU ▼
Read by QxMD icon Read
search

MTF

keyword
https://www.readbyqxmd.com/read/29146479/visual-outcome-of-penetrating-keratoplasty-deep-anterior-lamellar-keratoplasty-and-descemet-membrane-endothelial-keratoplasty
#1
Clàudia Garrido, Genís Cardona, Josep L Güell, Jaume Pujol
PURPOSE: A single-center, cross-sectional study was designed to assess and compare objective and subjective quality of vision of patients intervened with penetrating keratoplasty (PK), deep anterior lamellar keratoplasty (DALK) and Descemet membrane endothelial keratoplasty (DMEK). METHODS: Forty-six patients previously intervened with PK (22 eyes), DALK (7 eyes) and DMEK (17 eyes) were recruited. Visual evaluation included spherical and cylindrical refraction, distance corrected visual acuity (DCVA), photopic contrast sensitivity (CS), optical quality, measured with the HD Analyzer (objective scattering index [OSI], MTF cut-off and Strehl ratio), and ocular and corneal aberrometry, measured with the KR-1W Wavefront Analyzer...
November 13, 2017: Journal of Optometry
https://www.readbyqxmd.com/read/29144853/sexual-experiences-in-transgender-people-the-role-of-desire-for-gender-confirming-interventions-psychological-well-being-and-body-satisfaction
#2
Sanne W C Nikkelen, Baudewijntje P C Kreukels
We examined the role of gender confirming treatment (i.e., hormonal treatment and genital surgery; GCT), psychological well-being, and body satisfaction in the sexual feelings and behaviors of transgender adults. A survey was conducted among a non-clinical sample of 325 male-to-female and 251 female-to-male Dutch adults (17-76yr, Mage = 41.87), divided into those with no GCT desire, those who desired (more) GCT, and those who completed GCT. Findings indicated that whereas GCT may positively affect sexual feelings, particularly in MtF's, body satisfaction may play an even bigger role...
November 16, 2017: Journal of Sex & Marital Therapy
https://www.readbyqxmd.com/read/29125721/the-association-between-comorbid-autism-spectrum-disorders-and-antipsychotic-treatment-failure-in-early-onset-psychosis-a-historical-cohort-study-using-electronic-health-records
#3
Johnny M Downs, Suzannah Lechler, Harry Dean, Nicola Sears, Rashmi Patel, Hitesh Shetty, Emily Simonoff, Matthew Hotopf, Tamsin J Ford, Covadonga M Diaz-Caneja, Celso Arango, James H MacCabe, Richard D Hayes, Laura Pina-Camacho
OBJECTIVE: In a sample of children and adolescents with first-episode psychosis, we investigated whether multiple treatment failure (MTF, defined as the initiation of a third trial of novel antipsychotic due to nonadherence, adverse effects, or insufficient response) was associated with comorbid autism spectrum disorders. METHODS: Data were from the electronic health records of 638 children (51% male) aged from 10 to 17 years with first-episode psychosis (per ICD-10 criteria) from January 1, 2008, to November 1, 2014, referred to mental health services in South London, United Kingdom; data were extracted using the Clinical Record Interactive Search (CRIS) system...
November 7, 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/29120719/supercritical-impregnation-and-optical-characterization-of-loaded-foldable-intraocular-lenses-using-supercritical-fluids
#4
Abir Bouledjouidja, Yasmine Masmoudi, Yanfeng Li, Wei He, Elisabeth Badens
PURPOSE: To prepare drug-loaded intraocular lenses (IOLs) used to combine cataract surgery with postoperative complication treatment through supercritical impregnation while preserving their optical properties. SETTING: Aix-Marseille Université, CNRS, Centrale Marseille, Laboratoire de Mécanique, Modélisation & Procédés Propres, Marseille, France, and He University Eye Hospital, Liaoning Province, China. DESIGN: Experimental study. METHODS: Supercritical impregnations of commercial foldable IOLs used in cataract surgery with ciprofloxacin (an antibiotic) and dexamethasone 21-phosphate disodium salt (an antiinflammatory drug) were performed in a noncontinuous mode...
October 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29113862/comparative-expression-analysis-of-immune-related-factors-in-the-sea-cucumber-apostichopus-japonicus
#5
Jingwei Jiang, Zunchun Zhou, Ying Dong, Zelong Zhao, Hongjuan Sun, Bai Wang, Bei Jiang, Zhong Chen, Shan Gao
In order to preliminarily explore the joint involvement of different immune-related factors during the same immune process in Apostichopus japonicus, the transcriptional expression of Cu/Zn superoxide dismutase (Cu/Zn-SOD), catalase (CAT), c-type lysozyme (c-LYZ), i-type lysozyme (i-LYZ), cathepsin D, melanotransferrin (MTF), Toll, c-type lectin (c-LCT) and complement 3 (C3) during the development from fertilized eggs to juveniles and after challenging the juveniles with Vibrio splendidus, Pseudoalteromonas nigrifaciens, Shewanella baltica and Bacillus cereus, respectively, was measured using the method of quantitative real-time PCR (qRT-PCR), and then the correlations among different immune-related factors were analyzed...
November 4, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29106686/the-identification-of-pivotal-transcriptional-factors-mediating-cell-responses-to-drugs-with-drug-induced-liver-injury-liabilities
#6
Falgun Shah, Alex Medvedev, Anne Mai Wassermann, Marian Brodney, Liying Zhang, Sergei Makarov, Robert V Stanton
Drug-induced liver injury (DILI) is a leading cause of drug attrition during drug development and a common reason for drug withdrawal from the market. The poor predictability of conventional animal-based approaches (Olson et al. 2000) necessitates the development of alternative testing approaches. Body of evidence associates DILI with the induction of stress-response genes in the liver cells (Yuan and Kaplowitz 2013). Here, we set out to identify signal transduction pathways predominantly involved in the regulation of gene transcription by DILI drugs...
November 2, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29101439/male-to-female-sex-reassignment-surgery-using-the-combined-vaginoplasty-technique-satisfaction-of-transgender-patients-with-aesthetic-functional-and-sexual-outcomes
#7
Dmitry Zavlin, Jürgen Schaff, Jean-Daniel Lellé, Kevin T Jubbal, Peter Herschbach, Gerhard Henrich, Benjamin Ehrenberger, Laszlo Kovacs, Hans-Günther Machens, Nikolaos A Papadopulos
BACKGROUND: Currently available patient-reported outcome measures are limited in the field of sex reassignment surgery (SRS). Standardized questionnaires deliver high evidence data on satisfaction of male-to-female (MTF) transgender patients but do not allow any modification in their clinical application. We therefore designed a prospective study using self-developed indication-specific questionnaires to evaluate the aesthetic, functional, and sexual outcomes of MTF patients undergoing SRS...
November 3, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/29095489/modeling-and-evaluation-of-a-high-resolution-cmos-detector-for-cone-beam-ct-of-the-extremities
#8
Qian Cao, Alejandro Sisniega, Michael Brehler, J Webster Stayman, John Yorkston, Jeffrey H Siewerdsen, Wojciech Zbijewski
PURPOSE: Quantitative assessment of trabecular bone microarchitecture in extremity cone-beam CT (CBCT) would benefit from the high spatial resolution, low electronic noise, and fast scan time provided by complementary metal-oxide semiconductor (CMOS) x-ray detectors. We investigate the performance of CMOS sensors in extremity CBCT, in particular with respect to potential advantages of thin (<0.7 mm) scintillators offering higher spatial resolution. METHODS: A cascaded systems model of a CMOS x-ray detector incorporating the effects of CsI:Tl scintillator thickness was developed...
November 2, 2017: Medical Physics
https://www.readbyqxmd.com/read/29094444/metformin-as-a-prophylactic-treatment-of-gestational-diabetes-in-pregnant-patients-with-pregestational-insulin-resistance-a-randomized-study
#9
Enrique Valdés, Alvaro Sepúlveda-Martínez, Paula Candia, Nancy Abusada, Rodrigo Orellana, Bárbara Manukian, Eduardo Cuellar
AIM: We aimed to assess the use of metformin (MTF) in the prevention of gestational diabetes mellitus (GDM) in patients with pregestational insulin resistance (PIR). METHODS: A double blind, multicenter, randomized trial was carried out in patients with a history of PIR and pregestational MTF treatment. Groups were allocated either to MTF 1700 mg/day or placebo. Patients were recruited between 12(+0) and 15(+6)  gestational weeks, and treatment was extended until week 36...
November 2, 2017: Journal of Obstetrics and Gynaecology Research
https://www.readbyqxmd.com/read/29082089/intra-ocular-lens-optical-changes-resulting-from-the-loading-of-dexamethasone
#10
José M Artigas, M Carmen García-Domene, Amparo Navea, Pablo Botella, Eduardo Fernández
To study the optical changes on hydrogel-silicone intraocular lenses (IOLs) resulting from loading them with dexamethasone. We used prototype hydrogel(pHEMA)-silicone IOLs and loaded the matrices with an anti-inflammatory drug (dexamethasone). The optical properties we analyzed experimentally were a) modulation transfer function (MTF); b) spectral transmission; c) diopter power. These determinations were performed on drug-loaded IOLs, IOLs that had released the drug, and IOLs that had not been drug-loaded. Loading a hydrogel-silicone IOL with dexamethasone results in impairment of its optical qualities, in particular its MTF and spectral transmission, but not dioptric power...
October 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29075159/endoscopic-endonasal-reconstructive-methods-to-the-anterior-skull-base
#11
REVIEW
Srikant Chakravarthi, Lior Gonen, Alejandro Monroy-Sosa, Sammy Khalili, Amin Kassam
The success of expanded endoscopic endonasal approaches (EEAs) to the anterior skull base, sellar, and parasellar regions has been greatly aided by the advancement in reconstructive techniques. In particular, the pedicled vascularized flaps have been developed and effectively cover skull base defects of varying sizes with a significant reduction in postoperative CSF leaks. There are two aims to this review: (1) We will provide our current, simplified reconstruction algorithm. (2) We will describe, in detail, the relevant anatomy, indications/contraindications, and surgical technique, with a particular emphasis on the nasoseptal flap (NSF)...
November 2017: Seminars in Plastic Surgery
https://www.readbyqxmd.com/read/29074130/heat-induced-oxidative-stress-and-inflammation-involve-in-cadmium-pollution-history-in-the-spleen-of-zebrafish
#12
Shu-Jiang Zhao, Sai-Nan Guo, Qing-Ling Zhu, Shuang-Shuang Yuan, Jia-Lang Zheng
Zebrafish were exposed to 0, 2.5 and 5 μg/L cadmium (Cd) for 10 weeks, and then each group was exposed to 26 °C(control) and 32 °C (high temperature) for 7 days. 22 indicators were compared between 26 °C and 32 °C in the spleen, including body weight, LPO and NO levels, activity levels of Cu/Zn-SOD, CAT and iNOS, MTs protein levels, and mRNA levels of Nrf2, Cu/Zn-SOD, CAT, HSF1, HSF2, HSP70, MTF-1, MTs, IL-6, IL-10, IL-1β, TNF-α, iNOS and NF-κB. Most indicators were not significantly affected by heat in fish from no Cd pollution...
October 24, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29064579/quantitative-imaging-of-peripheral-trabecular-bone-micro-architecture-using-mdct
#13
Cheng Chen, Xiaoliu Zhang, Junfeng Guo, Dakai Jin, Elena M Letuchy, Trudy L Burns, Steven M Levy, Eric A Hoffman, Punam K Saha
PURPOSE: Osteoporosis associated with reduced bone mineral density (BMD) and micro-architectural changes puts patients at an elevated risk of fracture. Modern multi detector-row CT (MDCT) technology, producing high spatial resolution at increasingly lower dose radiation, is emerging as a viable modality for trabecular bone (Tb) imaging. Wide variation in CT scanners raise concerns of data uniformity in multi-site and longitudinal studies. A comprehensive cadaveric study was performed to evaluate MDCT-derived Tb micro-architectural measures...
October 24, 2017: Medical Physics
https://www.readbyqxmd.com/read/29064378/technical-characterization-of-five-x-ray-detectors-for-paediatric-radiography-applications
#14
Nicholas W Marshall, Marleen H Smet, Maarten Hofmans, Herman Pauwels, Thomas De Clerq, Hilde Bosmans
Physical image quality of five x-ray detectors used in the paediatric imaging department is characterized with the aim of establishing the range/scope of imaging performance provided by these detectors for neonatal imaging. Two computed radiography (CR) detectors (MD4.0 powder imaging plate (PIP) and HD5.0 needle imaging plate (NIP), Agfa HealthCare NV, B-2640 Mortsel, Belgium) and three flat panel detectors (FPD) (the Agfa DX-D35C and DX-D45C and the DRX-2530C (Carestream Health Inc., Rochester - NY 14608, USA)) were assessed...
October 24, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29049966/performance-comparison-of-secondary-and-tertiary-treatment-systems-for-treating-antibiotic-resistance
#15
Manisha Lamba, Shaikh Ziauddin Ahammad
Rapid emergence of antibiotic resistance (AR) in developing countries is posing a greater health risk and increasing the global disease burden. AR proliferation mediated by treated/untreated discharges from sewage treatment plants (STPs) is a prime public health concern. Efficient sewage treatment is among our key defenses against the dissemination of infectious diseases. The present study aims to estimate the efficiency of aerobic [activated sludge process (ASP) and modified trickling filter (MTF)] and anaerobic reactors (anaerobic flow-through reactor) along with the three disinfection techniques (UV, ozone and chlorination) in reducing ARB and ARGs present in the domestic sewage...
October 12, 2017: Water Research
https://www.readbyqxmd.com/read/29048330/calibration-and-analysis-of-a-multimodal-micro-ct-and-structured-light-imaging-system-for-the-evaluation-of-excised-breast-tissue
#16
David Martin McClatchy Iii, Elizabeth J Rizzo, Jeff Meganck, Josh Kempner, Jared Vicory, Wendy A Wells, Keith D Paulsen, Brian W Pogue
A multimodal micro-computed tomography (CT) and multi-spectral structured light imaging (SLI) system is introduced and systematically analyzed to test its feasibility to aid in margin delineation during breast conserving surgery (BCS). Phantom analysis of the micro-CT yielded a signal-to-noise ratio (SNR) of 34, a contrast of 1.64, and a minimum detectable resolution of 240 m for a 1.2 min scan. The SLI system, spanning wavelengths 490 nm to 800 nm and spatial frequencies up to 1.37 mm-1, was evaluated with aqueous tissue simulating phantoms having variations in particle size distribution, scatter density, and blood volume fraction...
October 19, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29048019/sampling-moir%C3%A3-technique-for-determination-of-optical-transfer-function-of-digital-imaging-systems
#17
Soheila Javadian Varjovi, Khosro Madanipour
In this paper, the optical transfer function (OTF) of a digital imaging system is determined by different frequencies' sinusoidal gratings in two stages of before and after the Nyquist frequency. Before the Nyquist frequency, modulation transfer function (MTF) and visibility are equivalent, and the phase transfer function (PTF) does not change with phase variation of the initial object gratings. Sampling of the grating with frequency above the Nyquist frequency gives rise to sampling moiré fringes. In this situation, the MTF is unusually bigger than 1 and is not equivalent to the visibility of the sampling moiré, but the PTF shows two different behaviors before and after the Nyquist frequency...
August 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047955/active-underwater-descattering-and-image-recovery
#18
Pingli Han, Fei Liu, Kui Yang, Jinyu Ma, Jianjun Li, Xiaopeng Shao
Underwater imaging is a promising but challenging topic due to the scattering particles in water, which result in serious light attenuation. Therefore, underwater images suffer from low-contrast and low-resolution issues. In this study, in order to recover high-quality underwater images, the point spread functions (PSFs) are estimated by a slant-edge method. The experiment modulates the illumination source to deal with backscattering and the imager to take two images in orthogonally polarized states. This imaging method benefits the satisfactory edge extraction...
August 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047914/image-quality-and-spectral-performance-evaluations-of-a-polarization-imaging-spectrometer-based-on-a-savart-polariscope
#19
Jingjing Ai, Peng Gao, Qingying Chen, Shuaiyi Zhang
The modulation transfer function (MTF) and signal-to-noise ratio (SNR) are the key parameters to evaluate quantitatively the image quality and spectral performance in a polarization imaging spectrometer based on a Savart polariscope. In order to evaluate the image quality and reflect the detecting ability of the imaging spectrometer, calibration experiments on the MTF, SNR, and spectral resolution were carried out and some important conclusions were obtained. For incident radiance values 4.464, 3.119, and 0...
July 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047708/how-good-is-your-lens-assessing-performance-with-mtf-full-field-displays
#20
Brandon Dube, Roger Cicala, Aaron Closz, Jannick P Rolland
Modern optical systems achieve incredible resolution and require more thorough testing. We present a method of evaluating and displaying the modulation transfer function (MTF) of a lens over its full rectangular field of view. The method consists of utilizing commercially available MTF test stations to gather data as well as custom software to plot the results. Critically, these measurements allow the characterization of misaligned systems with much higher accuracy than the typical three- or five-field-point MTF measurements yield...
July 10, 2017: Applied Optics
keyword
keyword
16611
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"