keyword
MENU ▼
Read by QxMD icon Read
search

iodin contrast

keyword
https://www.readbyqxmd.com/read/28543761/experimental-characterization-of-a-direct-conversion-amorphous-selenium-detector-with-thicker-conversion-layer-for-dual-energy-contrast-enhanced-breast-imaging
#1
David A Scadutom, Olivier Tousignant, Wei Zhao
PURPOSE: Dual-energy contrast-enhanced imaging is being investigated as a tool to identify and localize angiogenesis in the breast, a possible indicator of malignant tumors. This imaging technique requires that x-ray images are acquired at energies above the k-shell binding energy of an appropriate radiocontrast agent. Iodinated contrast agents are commonly used for vascular imaging, and require x-ray energies greater than 33 keV. Conventional direct conversion amorphous selenium (a-Se) flat panel imagers for digital mammography show suboptimal absorption efficiencies at these higher energies...
May 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/28542094/virtual-monoenergetic-imaging-and-iodine-perfusion-maps-improve-diagnostic-accuracy-of-dual-energy-computed-tomography-pulmonary-angiography-with-suboptimal-contrast-attenuation
#2
Doris Leithner, Julian L Wichmann, Thomas J Vogl, Jesko Trommer, Simon S Martin, Jan-Erik Scholtz, Boris Bodelle, Carlo N De Cecco, Taylor Duguay, John W Nance, U Joseph Schoepf, Moritz H Albrecht
OBJECTIVES: The aim of this study was to investigate the impact of virtual monoenergetic imaging (VMI+) and dual-energy computed tomography perfusion maps (DECT-PMs) on reader confidence and diagnostic accuracy in dual-energy computed tomography pulmonary angiography (DE-CTPA) studies with suboptimal contrast attenuation, compared with standard linearly blended reconstruction series. MATERIALS AND METHODS: Dual-energy computed tomography pulmonary angiography examinations with suboptimal contrast attenuation of 68 patients with suspected pulmonary embolism (PE) were included in this institutional review board-approved retrospective study...
May 24, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28541197/high-energy-resolution-hyperspectral-x-ray-imaging-for-low-dose-contrast-enhanced-digital-mammography
#3
Silvia Pani, Sarene Saifuddin, Filipa Ferreira, Nicholas Henthorn, Paul Seller, Paul Sellin, Philipp Stratmann, Matthew Veale, Matthew Wilson, Robert Cernik
Contrast-enhanced digital mammography (CEDM) is an alternative to conventional X-ray mammography for imaging dense breasts. However, conventional approaches to CEDM require a double exposure of the patient, implying higher dose and risk of incorrect image registration due to motion artifacts. A novel approach is presented, based on hyperspectral imaging, where a detector combining positional and high-resolution spectral information (in this case based on Cadmium Telluride) is used. This allows simultaneous acquisition of the two images required for CEDM...
May 18, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28540212/infarct-characterization-using-ct
#4
REVIEW
Ludovico La Grutta, Patrizia Toia, Erica Maffei, Filippo Cademartiri, Roberto Lagalla, Massimo Midiri
Myocardial infarction (MI) is a major cause of death and disability worldwide. The incidence is not expected to diminish, despite better prevention, diagnosis and treatment, because of the ageing population in industrialized countries and unhealthy lifestyles in developing countries. Nowadays it is highly requested an imaging tool able to evaluate MI and viability. Technology improvements determined an expansion of clinical indications from coronary plaque evaluation to functional applications (perfusion, ischemia and viability after MI) integrating additional phases and information in the mainstream examination...
April 2017: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/28540211/delayed-enhancement-cardiac-computed-tomography-for-the-assessment-of-myocardial-infarction-from-bench-to-bedside
#5
REVIEW
Gaston A Rodriguez-Granillo
A large number of studies support the increasingly relevant prognostic value of the presence and extent of delayed enhancement (DE), a surrogate marker of fibrosis, in diverse etiologies. Gadolinium and iodinated based contrast agents share similar kinetics, thus leading to comparable myocardial characterization with cardiac magnetic resonance (CMR) and cardiac computed tomography (CT) at both first-pass perfusion and DE imaging. We review the available evidence of DE imaging for the assessment of myocardial infarction (MI) using cardiac CT (CTDE), from animal to clinical studies, and from 16-slice CT to dual-energy CT systems (DECT)...
April 2017: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/28537597/coherent-ultrafast-lattice-directed-reaction-dynamics-of-triiodide-anion-photodissociation
#6
Rui Xian, Gastón Corthey, David M Rogers, Carole A Morrison, Valentyn I Prokhorenko, Stuart A Hayes, R J Dwayne Miller
Solid-state reactions are influenced by the spatial arrangement of the reactants and the electrostatic environment of the lattice, which may enable lattice-directed chemical dynamics. Unlike the caging imposed by an inert matrix, an active lattice participates in the reaction, however, little evidence of such lattice participation has been gathered on ultrafast timescales due to the irreversibility of solid-state chemical systems. Here, by lowering the temperature to 80 K, we have been able to study the dissociative photochemistry of the triiodide anion (I3(-)) in single-crystal tetra-n-butylammonium triiodide using broadband transient absorption spectroscopy...
June 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28532702/trimetazidine-in-the-prevention-of-contrast-induced-nephropathy-in-chronic-kidney-disease
#7
Tarek A Ibrahim, Ramzy H El-Mawardy, Ahmed S El-Serafy, Ehab M El-Fekky
BACKGROUND: Contrast induced nephropathy (CIN) may be defined as Acute Renal Failure (ARF) that occurs within 24-72h of exposure to intra-venous or intra-arterial iodinated contrast media that cannot be attributed to other causes. CIN occurs in up to 5% of hospitalized patients with normal renal function prior to injection of contrast media. It occurs more frequently in patients with renal impairment particularly if associated with diabetic nephropathy. Among all procedures utilizing contrast agents for either diagnostic or therapeutic purposes, coronary angiography and percutaneous coronary interventions are associated with the highest rates of CIN...
February 10, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28528465/contrast-induced-nephropathy-cin-of-patients-with-renal-dysfunction-in-ct-examination
#8
Yasuhiro Fukushima, Hitomi Miyazawa, Junpei Nakamura, Ayako Taketomi-Takahashi, Takayuki Suto, Yoshito Tsushima
PURPOSE: To investigate the incidence and risk factors of contrast induced nephropathy (CIN) after contrast enhanced (CE) computed tomography (CT) in patients with renal dysfunction. MATERIALS AND METHODS: Two hundred sixteen inpatients with estimated glomerular filtration rates (eGFR) <60 ml/min/1.73 m(2) underwent CE CT using iodine doses of 420 or 480 mg I/kg. Data of all enrolled patients was collected for baseline serum creatinine level (SCr), post-CE CT SCr within 3 days after CE CT, and conditions considered risk factors for CIN [renal dysfunction, contrast media dose, advanced age, diabetes mellitus, no intravenous hydration, cardiac dysfunction (left ventricular ejection fraction <60%) and intensive-care unit (ICU) admission]...
May 20, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28526950/the-effect-of-post-mortem-computed-tomography-angiography-pmcta-using-water-soluble-iodine-based-radiographic-contrast-on-histological-analysis-of-the-liver-kidneys-and-left-ventricle-of-the-heart
#9
Samantha Higgins, Sarah Parsons, Noel Woodford, Matthew Lynch, Christopher Briggs, Chris O'Donnell
The purpose of this study was to investigate the impact of post-mortem computed-tomography angiography (PMCTA) on the histology of the liver, kidneys and heart. Multiple tissue cores were collected from the liver, left and right kidneys and left ventricle utilizing CT-guided biopsy. Subsequent whole body PMCTA was performed using a solution of polyethylene glycol and iodinated radiographic contrast, and an embalming pump. Corresponding biopsy cores were collected at autopsy, and blinded histology analysis assessing for PMCTA-induced histology artefact was performed...
May 20, 2017: Forensic Science, Medicine, and Pathology
https://www.readbyqxmd.com/read/28526539/diagnostic-accuracy-of-lung-subtraction-iodine-mapping-ct-for-the-evaluation-of-pulmonary-perfusion-in-patients-with-chronic-thromboembolic-pulmonary-hypertension-correlation-with-perfusion-spect-ct
#10
Masashi Tamura, Yoshitake Yamada, Takashi Kawakami, Masaharu Kataoka, Yu Iwabuchi, Hiroaki Sugiura, Masahiro Hashimoto, Tadaki Nakahara, Shigeo Okuda, Seishi Nakatsuka, Fumiya Sano, Takayuki Abe, Yuichiro Maekawa, Keiichi Fukuda, Masahiro Jinzaki
BACKGROUND: For treatment of chronic thromboembolic pulmonary hypertension (CTEPH), the evaluation of segmental pulmonary perfusion is important. There are no previous reports about lung subtraction iodine mapping (LSIM) computed tomography (CT) for evaluation of segmental pulmonary perfusion in patients with CTEPH, using lung perfusion SPECT/CT (LPS) as the reference. METHODS: 50 patients (age, 60.7±16.7years) with known or suspected CTEPH were enrolled in this study...
May 4, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28522155/fibroelastic-pseudotumour-elastofibroma-dorsi-detected-by-18-f-fdg-pet-ct-and-by-posttherapy-radioiodine-spect-ct
#11
M Oporto, F Cepa, N Orta, S Rubí, H Navalón, C Peña
Radioiodine uptake in the thyroid tissue, metastasis of differentiated thyroid cancer (DTC), and in other tissues, depends on the expression of sodium-iodide symporter (NIS). Vascular permeability, effusions, inflammation, and other mechanisms may also play a role in the accumulation of radioactive iodine. A 63-year-old woman underwent radioiodine therapy, as well as a post-therapy whole-body scan,as she was suspected of having lung metastasis from thyroid carcinoma. The scan not only showed uptake at the lung metastasis but also a faint diffuse bilateral uptake in the posterior thorax...
May 15, 2017: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/28514218/the-effect-of-iodine-based-contrast-material-on-radiation-dose-at-ct-it-s-complicated
#12
John M Boone, Andrew M Hernandez
No abstract text is available yet for this article.
June 2017: Radiology
https://www.readbyqxmd.com/read/28514045/contrast-extravasation-versus-hemorrhage-after-thrombectomy-in-patients-with-acute-stroke
#13
Vivek Yedavalli, Steffen Sammet
BACKGROUND AND PURPOSE: Intra-arterial recanalization postprocedural imaging in stroke patients can result in diagnostic complications due to hyperdensities on noncontrast computed tomography (CT), which may represent either contrast extravasation or intracranial hemorrhage. If these lesions are hemorrhage, then they are risk factors becoming symptomatic, which, if not distinguished, can alter clinical management. We investigate the effects of iodinated contrast on postprocedural magnetic resonance imaging (MRI) and prevalence of equivocal imaging interpretations of postprocedural extravasated contrast versus hemorrhage while identifying protocol pitfalls...
May 17, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28511219/-innovative-ultrasound-contrast-enhanced-ultrasound-of-the-kidneys
#14
Konrad Stock, Herbert Kübler, Tobias Maurer, Daniel Weiss, Hans-Peter Weskott, Uwe Heemann
Ultrasound examination of the kidneys with grey-scale imaging and colour Doppler ultrasound is the most common renal imaging modality. A few years ago, contrast-enhanced ultrasound (CEUS) emerged as a non-invasive perfusion imaging modality to evaluate the renal vessels and microvascularisation. These contrast media contain intravenous microbubbles (sulfur hexafluoride), which have no deleterious effect on renal function. Being free of iodine, they also pose no risk for the thyroid gland. CEUS of the kidneys is mainly used for the evaluation of renal cysts and the analysis of renal lesions suspicious for malignancy...
April 2017: Aktuelle Urologie
https://www.readbyqxmd.com/read/28507663/molecular-engineering-and-sequential-cosensitization-for-preventing-the-trade-off-effect-with-photovoltaic-enhancement
#15
Weiwei Zhang, Yongzhen Wu, Xin Li, Erpeng Li, Xiongrong Song, Huiyun Jiang, Chao Shen, Hao Zhang, He Tian, Wei-Hong Zhu
In dye-sensitized solar cells (DSSCs), it is essential to use rational molecular design to obtain promising photosensitizers with well-matched energy levels and narrow optical band gaps. However, the "trade-off" effect between the photocurrent and photovoltage is still a challenge. Here we report four benzoxidazole based D-A-π-A metal-free organic dyes (WS-66, WS-67, WS-68 and WS-69) with different combinations of π-spacer units and anchoring-acceptor groups. Either extending the π-spacer or enhancing the electron acceptor can efficiently modulate the molecular energy levels, leading to a red-shift in the absorption spectra...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28501642/a-novel-method-for-photo-oxidative-degradation-of-diatrizoate-in-water-via-electromagnetic-induction-electrodeless-lamp
#16
Lingjun Meng, Shaogui Yang, Cheng Sun, Huan He, Qiming Xian, Shiyin Li, Guoxiang Wang, Limin Zhang, Dong Jiang
In this study, an electromagnetic induction electrodeless lamp (EIEL) was first introduced into UV advanced oxidation processes (AOPs) for photodegradation of Diatrizoate (DTZ), which was the most persistent iodinated X-ray contrast medium (ICM), and traditional Hg lamps were taken as references. Direct photolysis rate of DTZ under EIEL irradiation was 1.34 times as that under Hg irradiation, but the electric energy consumption was 0.87 times. In this sense, the combination of EIEL and oxidants (O2, H2O2 and S2O8(2-)(PS)) was further investigated...
May 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28501080/intravenous-contrast-induced-nephropathy-the-rise-and-fall-of-a-threatening-idea
#17
REVIEW
Lyndon Luk, Jonathan Steinman, Jeffrey H Newhouse
Contrast-induced nephropathy (CIN) has been considered to be a cause of renal failure for over 50 years, but careful review of past and recent studies reveals the risks of CIN to be overestimated. Older studies frequently cited the use of high-osmolality contrast media, which have since been replaced by low-osmolality contrast media, which have lower risks for nephropathy. In addition, literature regarding CIN typically describes the incidence following cardiac angiography, whereas the risk of CIN from intravenous injection is much lower...
May 2017: Advances in Chronic Kidney Disease
https://www.readbyqxmd.com/read/28501076/intravenous-contrast-friend-or-foe-a-review-on-contrast-induced-nephropathy
#18
REVIEW
Catherine Do
Intravenous iodinated contrast is used in many contrasted imaging studies ranging from computed tomography to angiography. The risks of contrast-induced nephropathy (CIN) and its incidence have not been clearly defined. Most iodinated contrast media used today are hypertonic compared with serum osmolality and pose biological risks. However, the risk of CIN in the general population may be overestimated. Confounding risk factors may contribute to acute kidney injury other than attributable risk of contrast exposure...
May 2017: Advances in Chronic Kidney Disease
https://www.readbyqxmd.com/read/28497630/acute-generalized-exanthematous-pustulosis-caused-by-an-iodinated-contrast-radiocontrast-medium-for-computed-tomography-arthrography-of-the-knee
#19
Charles Velter, Catherine Schissler, Chloé Moulinas, Martine Tebacher-Alt, Jean-Marie Siedel, Bernard Cribier, Dan Lipsker
No abstract text is available yet for this article.
June 2017: Contact Dermatitis
https://www.readbyqxmd.com/read/28495233/sorption-and-speciation-of-iodine-in-groundwater-system-the-roles-of-organic-matter-and-organic-mineral-complexes
#20
Junxia Li, Hailing Zhou, Yanxin Wang, Xianjun Xie, Kun Qian
Characterizing the properties of main host of iodine in soil/sediment and the geochemical behaviors of iodine species are critical to understand the mechanisms of iodine mobilization in groundwater systems. Four surface soil and six subsurface sediment samples were collected from the iodine-affected area of Datong basin in northern China to conduct batch experiments and to evaluate the effects of NOM and/or organic-mineral complexes on iodide/iodate geochemical behaviors. The results showed that both iodine contents and kf-iodate values had positive correlations with solid TOC contents, implying the potential host of NOM for iodine in soil/sediment samples...
April 24, 2017: Journal of Contaminant Hydrology
keyword
keyword
94182
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"