keyword
MENU ▼
Read by QxMD icon Read
search

BIRADS

keyword
https://www.readbyqxmd.com/read/28067435/mr-imaging-findings-in-molecular-subtypes-of-breast-cancer-according-to-birads-system
#1
Lidia Navarro Vilar, Salvador Pascual Alandete Germán, Rosana Medina García, Esther Blanc García, Natalia Camarasa Lillo, José Vilar Samper
To evaluate magnetic resonance imaging (MRI) findings, according to Breast Imaging-Reporting and Data System (BI-RADS), and to relate them with molecular subtypes of breast cancer. The MRI findings were reviewed retrospectively in 201 women diagnosed of invasive breast cancer confirmed by surgery and were compared with the molecular subtypes. Following the BI-RADS, MRI findings included disease type, size, enhancement, morphology and contrast kinetics. In mass-like lesion types were studied shape, margin and enhancement, and in nonmass-like lesion types, distribution modifiers and internal enhancement...
January 9, 2017: Breast Journal
https://www.readbyqxmd.com/read/28067367/reply-to-the-comment-on-trans-1-2-disiloxybenzocyclobutene-an-adequate-partner-for-the-auto-oxidation-epr-spin-trapping-and-theoretical-studies-by-h-g-korth-p-mulder-and-t-paul-phys-chem-chem-phys-2017-19-c6cp04187f
#2
Yannick Carissan, Paola Nava, Béatrice Tuccio, Laurent Commeiras, Jean-Luc Parrain
The proposal and the comments made by Korth et al. on a biradical intermediate along the isomerization path of the reaction of trans-1,2-tert-butyldimethyldisilyloxybenzocyclobutene 1 with dioxygen are unsuitable in our case. The mechanism scenario that we proposed is in agreement with our experimental observations. Moreover, new calculations were able to give an answer to the crucial question, "is the biradical an intermediate or a transition state?" together with the localization of the two radicals. This full article is a response to the "Comment on "trans-1,2-Disiloxybenzocyclobutene, an adequate partner for the auto-oxidation: EPR/spin trapping and theoretical studies" by J...
January 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28057293/fibroepithelial-breast-lesions-diagnosed-by-core-needle-biopsy-demonstrate-a-moderate-rate-of-upstaging-to-phyllodes-tumors
#3
Gabriel Marcil, Stephanie Wong, Nora Trabulsi, Alexandra Allard-Coutu, Armen Parsyan, Atilla Omeroglu, Gulbeyaz Atinel, Benoit Mesurolle, Sarkis Meterissian
BACKGROUND: Fibroepithelial lesions of the breast (FEL) are atypical lesions diagnosed on core-needle biopsy. The purpose of this study was to determine the rate at which FELs are upstaged to phyllodes tumor on excision, and to examine the clinical and radiological factors that may be predictive of upstaging. METHODS: A retrospective review from the medical records of patients diagnosed with FEL on CNB at a single institution between 2010 and 2015 was performed...
December 27, 2016: American Journal of Surgery
https://www.readbyqxmd.com/read/28044952/diagnostic-value-of-frozen-section-in-patients-with-non-palpable-breast-lesions
#4
Hacı Hasan Abuoglu, Emre Günay, Oğuzhan Sunamak, M Rafet Yiğitbaşı
AIM: We analyzed wire-marking, frozen section (FS) and surgical approach in malignancy-suspicious non-palpable lesions detected on mammography (MG) and ultrasonography (US) as breast mass, microcalcifications and distorsions. Material and Methods: A hundred patients in whom wiremarking and frozen section analysis was performed because of non-palpable, malignancy-suspected breast lesions at General Surgery Department, Goztepe Training and Research Hospital, Istanbul were analyzed retrospectively...
November 2016: Chirurgia
https://www.readbyqxmd.com/read/28000810/comment-on-trans-1-2-disiloxybenzocyclobutene-an-adequate-partner-for-the-auto-oxidation-epr-spin-trapping-and-theoretical-studies-by-j-drujon-et-al-phys-chem-chem-phys-2014-16-7513
#5
Hans-Gert Korth, Peter Mulder, Thomas Paul
Despite the claim of the contrary, (i) the facile formation of a ring-opened cyclic peroxide from reaction of a 1,2-disubstituted benzocyclobutene with molecular oxygen has been reported before, and (ii) the analysis of the mechanistic steps of this process is incomplete, as only the symmetry-allowed conrotatory ring-opening of the benzocyclobutene has been considered. The probable involvement of biradical intermediates/biradicaloid transition states in a formally symmetry-forbidden reaction sequence has not been taken into account...
December 21, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27933881/neutral-aminyl-radicals-derived-from-azoimidazolium-dyes
#6
Léonard Y M Eymann, Alexander G Tskhovrebov, Andrzej Sienkiewicz, José L Bila, Ivica Živković, Henrik M Rønnow, Matthew D Wodrich, Laurent Vannay, Clémence Corminboeuf, Philip Pattison, Euro Solari, Rosario Scopelliti, Kay Severin
The synthesis and characterization of a new class of neutral aminyl radicals is reported. Monoradicals were obtained by reduction of azoimidazolium dyes with potassium. Structural, spectroscopic, and computational data suggest that the spin density is centered on one of the nitrogen atoms of the former azo group. The reduction of a dimeric dye with an octamethylbiphenylene bridge between the azo groups resulted in the formation of a biradical with largely independent unpaired electrons. Both the monoradicals and the biradical were found to display high stability in solution as well as in the solid state...
November 23, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27906486/the-fractional-occupation-number-weighted-density-as-a-versatile-analysis-tool-for-molecules-with-a-complicated-electronic-structure
#7
Christoph Alexander Bauer, Andreas Hansen, Stefan Grimme
The fractional occupation number weighted density (FOD) analysis is explored as a general theoretical diagnostic for complicated electronic structures. Its main feature is to provide robustly and fast the information where 'hot' (strongly correlated and chemically active) electrons are localized in a molecule. We demonstrate its usage in four different prototypical applications: (i) As a new and fast measure for the biradical character of polycyclic aromatic hydrocarbons, (ii) for the selection of active orbital spaces in multiconfigurational or complete active space self consistent field (MCSCF/CASSCF) treatments, (iii) as a possibility to consistently describe molecular energy landscapes in regions with varying biradical character as exemplified by partial double bond torsions, and (iv) as a powerful visualization method for static electron correlation effects in large biomolecules in connection with an efficient semi-empirical tight-binding molecular orbital scheme...
December 1, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27812560/orientation-order-and-rotation-mobility-of-nitroxide-biradicals-determined-by-quantitative-simulation-of-epr-spectra
#8
Alexey V Bogdanov, Andrey Kh Vorobiev
The problem of quantitative numerical simulation of electron paramagnetic resonance (EPR) spectra of biradical probes in both isotropic and aligned media was solved for the first time. The models suitable for the description of the spectra of the probes, both in the rigid limit and in the presence of rotational motions, were developed and successfully applied to model systems. The simulation of EPR spectra allows obtaining the following information about the molecular structure and dynamics: the values of orientation order parameters, the type of rotation mobility and its quantitative characteristics, and the sign and value of the spin exchange constant of the biradical...
November 16, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27771952/using-molecular-architecture-to-control-the-reactivity-of-a-triplet-vinylnitrene
#9
Sujan K Sarkar, Onyinye Osisioma, William L Karney, Manabu Abe, Anna D Gudmundsdottir
Photolysis of 3-azido-1-indenone (1) with a light-emitting diode (LED, λ = 405 nm) or mercury arc lamp (Pyrex) resulted in the formation of heterodimer 3 in excellent yield, through dimerization of triplet vinylnitrene (3)2. At ambient temperature, vinylnitrene (3)2 (λmax at 340 and 480 nm) was detected directly with laser flash photolysis of vinyl azide 1. The vinylnitrene intermediate was also characterized directly with IR and ESR spectroscopy in cryogenic matrices. The ESR spectrum of vinylnitrene (3)2 yielded a zero-field splitting parameter |D/hc| of 0...
November 16, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27747007/cell-block-samples-from-endobronchial-ultrasound-transbronchial-needle-aspiration-provide-sufficient-material-for-ancillary-testing-in-lung-cancer-a-quaternary-referral-centre-experience
#10
Emily Hopkins, David Moffat, Ian Parkinson, Peter Robinson, Hubertus Jersmann, Brendan Dougherty, Mohammed I Birader, Kate Francis, Phan Nguyen
BACKGROUND: Rapid on site examination (ROSE) is encouraged at endobronchial ultrasound transbronchial needles aspiration (EBUS-TBNA) to improve diagnostic yield. Due to new therapeutic options in lung cancer, it is not sufficient to merely distinguish between non-small cell lung carcinoma (NSCLC) and small cell lung carcinoma (SCLC). Immunohistochemistry (IHC) distinction is now standard practice, as well as additional molecular testing where clinically indicated. We investigated the diagnostic yield of on-site smears vs...
September 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/27730235/double-quantum-coherence-esr-spectroscopy-and-quantum-chemical-calculations-on-a-bdpa-biradical
#11
Haleh Hashemi Haeri, Philipp Spindler, Jörn Plackmeyer, Thomas Prisner
Carbon-centered radicals are interesting alternatives to otherwise commonly used nitroxide spin labels for dipolar spectroscopy techniques because of their narrow ESR linewidth. Herein, we present a novel BDPA biradical, where two BDPA (α,α,γ,γ-bisdiphenylene-β-phenylallyl) radicals are covalently tethered by a saturated biphenyl acetylene linker. The inter-spin distance between the two spin carrier fragments was measured using double quantum coherence (DQC) ESR methodology. The DQC experiment revealed a mean distance of only 1...
October 12, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27722408/role-of-a-singlet-diradical-character-in-carbon-nanomaterials-a-novel-hot-spot-for-efficient-nonlinear-optical-materials
#12
Shabbir Muhammad, Masayoshi Nakano, Abdullah G Al-Sehemi, Yasutaka Kitagawa, Ahmad Irfan, Aijaz R Chaudhry, Ryohei Kishi, Soichi Ito, Kyohei Yoneda, Kotaro Fukuda
Carbon atoms have the potential to produce a variety of fascinating all-carbon structures with amazing electronic and mechanical properties. Over the last few decades, several efforts have been made using experimental and computational techniques to functionalize graphene, carbon nanotubes and fullerenes for potential use in modern hi-tech electronic, medicinal, optical and nonlinear optical (NLO) applications. Since photons replaced electrons as a carrier of information, the field of NLO material design has drawn immense interest in contemporary materials science...
September 30, 2016: Nanoscale
https://www.readbyqxmd.com/read/27722293/triplet-state-formation-and-quenching-dynamics-of-2-mercaptobenzothiazole-in-solution
#13
Daisuke Koyama, Andrew J Orr-Ewing
The photochemical dynamics of the thione 2-mercaptobenzothiazole (MBT) initiated by absorption of 330 nm ultraviolet light are investigated by ultrafast transient absorption spectroscopy. The lowest energy triplet state (T1) has mixed (3)ππ*/(3)nπ* character and is populated with a quantum yield of 0.58 ± 0.01 from the photo-excited (1)ππ* S2 state in methanol solution via rapid internal conversion to the (1)nπ* S1 state (with time constant τ1 < 150 fs). The spectroscopic evidence points to a mechanism involving intersystem crossing from S1 to the (3)nπ*/(3)ππ* T2 state (τ2 = 400 ± 100 fs) and internal conversion to T1 (with time constant for growth τ3 = 6...
September 21, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27670569/malignancy-rate-number-needed-to-treat-and-positive-predictive-value-for-breast-mri
#14
John S Kennedy, Patrick A Robbins
Breast MRI is being used more frequently for advanced screening for breast cancer. Patients may be at increased risk, or are symptomatic, with nonsuspicious mammograms. There is little data regarding the likelihood of a recommendation for biopsy, or for detecting a malignancy, in this population. We intended to determine the malignancy rate, number needed to treat, and positive predictive value for patients receiving adjunctive MRI at our institution. A retrospective review of all breast MRIs from 2008 to 2010 was done...
September 2016: American Surgeon
https://www.readbyqxmd.com/read/27661775/diagnostic-performance-of-diffusion-tensor-imaging-parameters-in-breast-cancer-and-correlation-with-the-prognostic-factors
#15
Can Onaygil, Handan Kaya, Mustafa Umit Ugurlu, Erkin Aribal
PURPOSE: To evaluate the diagnostic performances of the diffusion tensor imaging (DTI) parameters in the diagnosis of breast cancer and to investigate the variations in DTI parameters according to the breast cancer biomarkers. MATERIALS AND METHODS: At 3.0 Tesla (T), DTI was performed in 85 patients with 92 enhancing breast lesions. λ1 , λ2 , λ3 , mean diffusivity (MD), radial diffusivity (RD), fractional anisotropy (FA), relative anisotropy (RA), and geodesic anisotropy (GA) were studied and compared with diffusion-weighted imaging-derived apparent diffusion coefficient...
September 23, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27661756/competition-between-meta-effect-photochemical-reactions-of-selected-benzophenone-compounds-having-two-different-substituents-at-meta-positions
#16
Jiani Ma, Huai Li, Xiting Zhang, Wen-Jian Tang, Mingde Li, David Lee Phillips
Recent studies conducted on some "meta effect" photochemical reactions focused on aromatic carbonyls having a substitution on one meta position of the benzophenone (BP) and anthraquinone parent compound. In this paper, two different substitutions were introduced with one at each meta position of the BP parent compound to investigate possible competition between different types of meta effect photochemistry observed in acidic solutions containing water. The photochemical pathways of 3-hydroxymethyl-3'-fluorobenzophenone (1) and 3-fluoro-3'-methylbenzophenone (2) were explored in several solvents, including acidic water-containing solutions, using time-resolved spectroscopic experiments and density functional theory computations...
October 21, 2016: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/27622201/the-value-of-constant-sharpness-as-a-diagnostic-sign-in-mr-mammography
#17
REVIEW
Clemens G Kaiser, Pascal Baltzer, Anna K Kaiser, Julia Krammer, Michael Uder, Werner A Kaiser, Matthias Dietzel
PURPOSE: To examine "constant lesion sharpness" as a morphological diagnostic sign in the differential diagnosis between benign and malignant lesions. MATERIAL AND METHODS: This prospective study had institutional review board approval and was HIPAA compliant. In total 1014 consecutive patients were examined (mean age 55 years ± 13 years) and evaluated in our University hospital towards the morphological shape of the lesion borders. The "Constant sharpness Sign" was defined as a lesion remaining continuously sharp for the duration of the dynamic scan...
2016: European Journal of Radiology Open
https://www.readbyqxmd.com/read/27610475/contrast-enhanced-dual-energy-spectral-mammogram-an-emerging-addendum-in-breast-imaging
#18
Kalpana D Kariyappa, Francis Gnanaprakasam, Subhapradha Anand, Murali Krishnaswami, Madan Ramachandran
OBJECTIVE: To assess the role of contrast-enhanced dual-energy spectral mammogram (CEDM) as a problem-solving tool in equivocal cases. METHODS: 44 consenting females with equivocal findings on full-field digital mammogram underwent CEDM. All the images were interpreted by two radiologists independently. Confidence of presence was plotted on a three-point Likert scale and probability of cancer was assigned on Breast Imaging Reporting and Data System scoring. Histopathology was taken as the gold standard...
November 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27586736/a-task-based-analytical-framework-for-ultrasonic-beamformer-comparison
#19
Nghia Q Nguyen, Richard W Prager, Michael F Insana
A task-based approach is employed to develop an analytical framework for ultrasound beamformer design and evaluation. In this approach, a Bayesian ideal-observer provides an idealized starting point and a way to measure information loss in practical beamformer designs. Different approximations of this ideal strategy are shown to lead to popular beamformers in the literature, including the matched filter, minimum variance (MV), and Wiener filter (WF) beamformers. Analysis of the approximations indicates that the WF beamformer should outperform the MV approach, especially in low echo signal-to-noise conditions...
August 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27585658/can-positron-emission-mammography-help-to-identify-clinically-significant-breast-cancer-in-women-with-suspicious-calcifications-on-mammography
#20
Almir G V Bitencourt, Eduardo N P Lima, Bruna R C Macedo, Jorge L F A Conrado, Elvira F Marques, Rubens Chojniak
OBJECTIVE: To evaluate the diagnostic accuracy of positron emission mammography (PEM) for identifying malignant lesions in patients with suspicious microcalcifications detected on mammography. METHODS: A prospective, single-centre study that evaluated 40 patients with suspicious calcifications at mammography and indication for percutaneous or surgical biopsy, with mean age of 56.4 years (range: 28-81 years). Patients who agreed to participate in the study underwent PEM with 18F-fluorodeoxyglucose before the final histological evaluation...
September 2, 2016: European Radiology
keyword
keyword
73319
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"