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https://www.readbyqxmd.com/read/29339048/intrarenal-fat-deposition-does-not-interfere-with-the-measurement-of-single-kidney-perfusion-in-obese-swine-using-multi-detector-computed-tomography
#1
Christopher M Ferguson, Alfonso Eirin, Gregory J Michalak, Ahmad F Hedayat, Abdelrhman Abumoawad, Ahmed Saad, Xiangyang Zhu, Stephen C Textor, Cynthia H McCollough, Lilach O Lerman
BACKGROUND: Altered vascular structure or function in several diseases may impair renal perfusion. Multi-detector computed tomography (MDCT) is a non-invasive tool to assess single-kidney perfusion and function based on dynamic changes in tissue attenuation during contrast media transit. However, changes in basal tissue attenuation might hamper these assessments, despite background subtraction. Evaluation of iodine concentration using the dual-energy (DECT) MDCT mode allows excluding effects of basal values on dynamic changes in tissue attenuation...
January 10, 2018: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/29334343/breast-milk-iodine-concentrations-and-iodine-levels-of-infants-according-to-the-iodine-status-of-the-country-of-residence-a-systematic-review-and-meta-analysis
#2
Pantea Nazeri, Ali Kabir, Hosein Dalili, Parvin Mirmiran, Fereidoun Azizi
BACKGROUND: Iodine, an essential micronutrient, plays a critical role in normal growth and development, especially during the first two years of life. This systematic review and meta-analysis is among the first to evaluate breast-milk iodine concentrations and infant iodine status in countries characterized by iodine sufficiency or deficiency. METHODS: PubMed, Web of Science, Cochrane Library, Google Scholar, and other relevant databases, as well as reference lists of previous reviews, were searched for relevant studies published between 1986 and 2016...
January 2018: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/29330950/comparative-anatomy-of-bat-jaw-musculature-via-diffusible-iodine-based-contrast-enhanced-computed-tomography
#3
Sharlene E Santana
Noctilionoid bats exhibit an extraordinary array of cranial specializations that match diverse diets, including variation in jaw musculature physiological cross-sectional areas (PCSA), lever arms, and relative contribution to bite force. Although previous research in this group has linked variation in skull shape and muscle mechanics to biting performance, there are still important gaps about the anatomical underpinnings of noctilionoid dietary adaptations, including the degree of compartmentalization of the jaw musculature, and whether and how muscle attachment sites have evolved across noctilionoid species that specialize on derived diets...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29328007/-prophylactic-hydration-to-protect-renal-function-from-intravascular-iodinated-contrast-material-in-patients-at-high-risk-of-contrast-induced-nephropathy-amacing-a-prospective-randomised-phase-3-controlled-open-label-non-inferiority-trial
#4
E C Nijssen, R J Rennenberg, P J Nelemans, B A Essers, M M Janssen, M A Vermeeren, V van Ommen, J E Wildberger
BACKGROUND: Intravenous saline is recommended in clinical practice guidelines as the cornerstone for preventing contrast-induced nephropathy in patients with compromised renal function. However, clinical-effectiveness and cost-effectiveness of this prophylactic hydration treatment in protecting renal function has not been adequately studied in the population targeted by the guidelines, against a group receiving no prophylaxis. This was the aim of the AMACING trial. METHODS: AMACING is a prospective, randomised, phase 3, parallel-group, open-label, non-inferiority trial of patients at risk of contrast-induced nephropathy according to current guidelines...
2018: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/29313367/lecithin-coated-gold-nanoflowers-gnfs-for-ct-scan-imaging-applications-and-biochemical-parameters-in-vitro-and-in-vivo-studies
#5
Farooq Aziz, Khizra Bano, Ahmad Hassan Siddique, Sadia Zafar Bajwa, Aalia Nazir, Anam Munawar, Ayesha Shaheen, Madiha Saeed, Muhammad Afzal, M Zubair Iqbal, Aiguo Wu, Waheed S Khan
We report a novel strategy for the fabrication of lecithin-coated gold nanoflowers (GNFs) via single-step design for CT imaging application. Field-emission electron microscope confirmed flowers like morphology of the as-synthesized nanostructures. Furthermore, these show absorption peak in near-infrared (NIR) region at λmax 690 nm Different concentrations of GNFs are tested as a contrast agent in CT scans at tube voltage 135 kV and tube current 350 mA. These results are compared with same amount of iodine at same CT scan parameters...
January 9, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29306370/weight-adapted-iodinated-contrast-media-administration-in-abdomino-pelvic-ct-can-image-quality-be-maintained
#6
E Perrin, M Jackson, R Grant, C Lloyd, F Chinaka, V Goh
INTRODUCTION: In many centres, a fixed method of contrast-media administration is used for CT regardless of patient body habitus. The aim of this trial was to assess contrast enhancement of the aorta, portal vein, liver and spleen during abdomino-pelvic CT imaging using a weight-adapted contrast media protocol compared to the current fixed dose method. METHODS: Thirty-nine oncology patients, who had previously undergone CT abdomino-pelvic imaging at the institution using a fixed contrast media dose, were prospectively imaged using a weight-adapted contrast media dose (1...
February 2018: Radiography
https://www.readbyqxmd.com/read/29301434/targeted-tumor-dual-mode-ct-mr-imaging-using-multifunctional-polyethylenimine-entrapped-gold-nanoparticles-loaded-with-gadolinium
#7
Benqing Zhou, Zuogang Xiong, Peng Wang, Chen Peng, Mingwu Shen, Serge Mignani, Jean-Pierre Majoral, Xiangyang Shi
We report the construction and characterization of polyethylenimine (PEI)-entrapped gold nanoparticles (AuNPs) chelated with gadolinium (Gd) ions for targeted dual mode tumor CT/MR imaging in vivo. In this work, polyethylene glycol (PEG) monomethyl ether-modified PEI was sequentially modified with Gd chelator and folic acid (FA)-linked PEG (FA-PEG) was used as a template to synthesize AuNPs, followed by Gd(III) chelation and acetylation of the remaining PEI surface amines. The formed FA-targeted PEI-entrapped AuNPs loaded with Gd (FA-Gd-Au PENPs) were well characterized in terms of structure, composition, morphology, and size distribution...
November 2018: Drug Delivery
https://www.readbyqxmd.com/read/29301186/clinical-course-of-infants-with-congenital-heart-disease-who-developed-thyroid-dysfunction-within-100-days
#8
Hye Jin Lee, Hyeoh Won Yu, Gi Beom Kim, Choong Ho Shin, Sei Won Yang, Young Ah Lee
PURPOSE: We investigated the clinical course of infants with congenital heart disease (CHD) who experienced thyroid dysfunction within 100 days of birth. METHODS: We performed retrospective medical reviews of 54 CHD patients (24 male patients) who underwent a thyroid function test (TFT) between January 2007 and July 2016. Data were collected on birth history, diagnosis of CHD, underlying chromosomal or genetic abnormalities, medication history, surgery, ventilator care, and exposure to iodine contrast media (ICM)...
December 2017: Annals of Pediatric Endocrinology & Metabolism
https://www.readbyqxmd.com/read/29277821/iodine-content-analysis-using-dual-energy-computed-tomography-as-a-biomarker-of-transitional-cell-carcinoma-an-experience-with-separation-of-the-clotted-blood-and-tumorous-tissue
#9
Hynek Mirka, Jan Baxa, Milan Hora, Ondrej Hes, Ondrej Topolcan, Jiri Ferda
BACKGROUND/AIM: The aim of this study was to evaluate the possibility to discriminate the blood clot from tumorous tissue in the assessment of transitional cell carcinoma (TCC), when CT data are used only from single-phase dual-energy CT (DECT). MATERIALS AND METHODS: A total of 18 patients were included into the retrospective analysis of the prospectively collected data (the average age was 67.3 years, range=62-79 years, 12 males, 6 females). DECT was performed in all patients after intravenous administration of the iodinated contrast material...
January 2018: Anticancer Research
https://www.readbyqxmd.com/read/29274126/computed-tomographic-contrast-tenography-of-the-digital-flexor-tendon-sheath-of-the-equine-hindlimb
#10
Rachel Agass, Jonathon Dixon, Barny Fraser
Pre-surgical investigation of digital flexor tendon sheath pathology remains challenging with current standard imaging techniques. The aim of this prospective, anatomical, pilot study was to describe the anatomy of the equine hind limb digital flexor tendon sheath using a combination of computed tomography (CT) and computed tomographic contrast tenography in clinically normal cadaver limbs. Ten pairs of hind limbs with no external abnormalities were examined from the level of the tarsometatarsal joint distally...
December 22, 2017: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/29261531/impact-of-contrast-media-concentration-on-low-kilovolt-computed-tomography-angiography-a-systematic-preclinical-approach
#11
Ulrike Fleischmann, Hubertus Pietsch, Johannes G Korporaal, Thomas G Flohr, Michael Uder, Gregor Jost, Michael M Lell
OBJECTIVES: Low peak kilovoltage (kVp) protocols in computed tomography angiography (CTA) demand a review of contrast media (CM) administration practices. The aim of this study was to systematically evaluate different iodine concentrations of CM in a porcine model. MATERIALS AND METHODS: Dynamic 70 kVp CTA was performed on 7 pigs using a third-generation dual-source CT system. Three CM injection protocols (A-C) with an identical total iodine dose and iodine delivery rate (150 mg I/kg, 12 s, 0...
December 19, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/29259515/intravascular-ultrasound-guided-cardiac-intervention-in-a-fontan-patient-with-allergy-to-contrast-media
#12
Jun Muneuchi, Seigo Okada, Yusaku Nagatomo, Chiaki Iida, Ryouhei Matsuoka, Masamitsu Shirozu, Mamie Watanabe
Allergy to contrast media is hazardous in patients who need multiple cardiac catheterizations. We describe the case of a 16-year-old boy who presented with fatigue and cyanosis. He had undergone a Fontan operation 14 years previously, after which he developed an allergy to iodinated contrast media. Contrast echocardiograms by manual injection of microbubbles suggested the presence of a venovenous collateral vessel from the brachiocephalic vein draining into the pulmonary vein. We used intravascular ultrasound as the sole imaging method to identify the target vessel and to guide deployment of an Amplatzer Vascular Plug II...
October 2017: Texas Heart Institute Journal
https://www.readbyqxmd.com/read/29250564/measuring-arterial-wall-perfusion-using-photon-counting-computed-tomography-ct-improving-ct-number-accuracy-of-artery-wall-using-image-deconvolution
#13
Kishore Rajendran, Shuai Leng, Steven M Jorgensen, Jill L Anderson, Ahmed F Halaweish, Dilbar Abdurakhimova, Erik L Ritman, Cynthia H McCollough
Changes in arterial wall perfusion mark the onset of atherosclerosis. A characteristic change is the increased spatial density of vasa vasorum (VV), the microvessels in the arterial walls. Measuring this increased VV (IVV) density using contrast-enhanced computed tomography (CT) has had limited success due to blooming effects from contrast media. If the system point-spread function (PSF) is known, then the blooming effect can be modeled as a convolution between the true signal and the PSF. We report the application of image deconvolution to improve the CT number accuracy in the arterial wall of a phantom and in a porcine model of IVV density, both scanned using a whole-body research photon-counting CT scanner...
October 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29247801/optimization-of-cranial-computed-tomography-in-patients-with-aids-and-clinical-suspicion-of-neural-opportunistic-pathology
#14
Silveira Filho Luiz Gonzaga da, Correia Dalmo
Cranial computed tomography (CT) is still valuable in the identification of opportunistic pathologies (OP) in AIDS' patients from low-income countries. Delayed iodinated contrast media (ICM) CT-images have the potential ability to better demonstrate inflammatory-infectious or neoplastic OP.
December 13, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/29247752/insight-into-the-dynamic-of-gadolinium-based-contrast-agent-gbca-hypersensitivity-acquisition-persistence-and-disappearance
#15
Ingrid Boehm, Martin Hungerbühler, Johannes T Heverhagen
Anaphylaxis against gadolinium based contrast agents (GBCAs) has been reported in all severity grades but is less frequent than hypersensitivity/allergy against iodinated contrast materials. Once a patient acquires such an adverse reaction a life-long premedication is usually the consequence in concert with GBCA-enhanced MR-imaging procedures. The usefulness of this prophylaxis has been questioned, and discussed controversially during the past. The herein presented case may shed some light into the dynamic of contrast-medium-induced hypersensitivity reactions...
December 13, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29242747/usefulness-of-preoperative-echography-for-detection-of-lymphatic-vessels-for-lymphaticovenous-anastomosis
#16
Hisako Hara, Makoto Mihara
Case 1: A 63-year-old woman with secondary lower limb lymphedema. As it was difficult to detect the lymphatic vessels in the right thigh in indocyanine green lymphography because of thick fat, we tried echography and observed circular structures beneath the superficial fascia. Intraoperatively, we found a dilated lymphatic vessel just as observed on echography. Case 2: A 45-year-old woman with primary lower limb lymphedema. As she was allergic to iodinated contrast medium, we could not use indocyanine green lymphography preoperatively...
2017: SAGE Open Medical Case Reports
https://www.readbyqxmd.com/read/29237046/exposure-to-contrast-media-in-the-perioperative-period-confers-no-additional-risk-of-acute-kidney-injury-in-surgical-patients
#17
Ian Zealley, Huan Wang, Peter T Donnan, Samira Bell
Background: Iodinated contrast media (CM) used in angiography and computed tomography (CT) scans is an important cause of acute kidney injury (AKI) in hospitalized patients undergoing surgery. Contrast-induced nephropathy leads to AKI soon after CM administration. The aim of the study was to determine whether the timing of contrast media exposure related to diagnostic imaging during the immediate perioperative period influences the risk of post-operative AKI. Methods: All patients aged 18 years or above who underwent diagnostic imaging within 7 days of non-cardiac surgery between 1 January 2003 and 31 December 2013 in the Tayside region of Scotland, UK were included in the analysis...
December 9, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/29234002/dual-energy-micro-ct-for-quantifying-the-time-course-and-staining-characteristics-of-ex-vivo-animal-organs-treated-with-iodine-and-gadolinium-based-contrast-agents
#18
Juliana Martins de Souza E Silva, Julian Utsch, Melanie A Kimm, Sebastian Allner, Michael F Epple, Klaus Achterhold, Franz Pfeiffer
Chemical staining of soft-tissues can be used as a strategy to increase their low inherent contrast in X-ray absorption micro-computed tomography (micro-CT), allowing to obtain fast three-dimensional structural information of animal organs. Though some staining agents are commonly used in this context, little is known about the staining agents' ability to stain specific types of tissues; the times necessary to provide a sufficient contrast; and the effect of staining solution in distorting the tissue. Here we contribute to studies of animal organs (mouse heart and lungs) using staining combined with dual-energy micro-CT (DECT)...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29228957/evaluation-of-the-effect-of-d-amino-acid-incorporation-into-amyloid-reactive-peptides
#19
Emily B Martin, Angela Williams, Tina Richey, Craig Wooliver, Alan Stuckey, James S Foster, Stephen J Kennel, Jonathan S Wall
BACKGROUND: Systemic amyloidoses comprise diseases characterized by the deposition of proteinaceous material known as amyloid. Currently, without performing multiple biopsies, there is no way to ascertain the extent of amyloid deposition in patients-a critical piece of information that informs prognosis and therapeutic strategies. We have developed pan-amyloid-targeting peptides for imaging amyloid and recently have adapted these for use as pre-targeting agents in conjunction with immunotherapy...
December 11, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29223090/oxidation-of-iopamidol-with-ferrate-fe-vi-kinetics-and-formation-of-toxic-iodinated-disinfection-by-products
#20
Huiyu Dong, Zhimin Qiang, Shaogang Liu, Jin Li, Jianwei Yu, Jiuhui Qu
Presence of iodinated X-ray contrast media (ICMs) in source water is of high concern, because of their potential to form highly toxic iodinated disinfection by-products (I-DBPs). This study investigated kinetics, mechanisms and products for oxidation of one ICMs, iopamidol (IPM) by ferrate (Fe(VI)). The obtained apparent second-order rate constants for oxidation of IPM by Fe(VI) ranged from 0.7 M-1 s-1 to 74.6 M-1 s-1 at pH 6.0-10.0, which were highly dependent on pH. It was found that the oxidation of IPM by Fe(VI) led to the formation of highly toxic I-DBPs...
December 5, 2017: Water Research
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