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https://www.readbyqxmd.com/read/28092637/non-invasive-classification-of-breast-microcalcifications-using-x-ray-coherent-scatter-computed-tomography
#1
Bahaa Ghammraoui, Lucretiu M Popescu
We investigate the use of energy dispersive x-ray coherent scatter computed tomography (ED-CSCT) as a non-invasive diagnostic method to differentiate between type I and type II breast calcifications. This approach is sensitive to the differences of composition and internal crystal structure of different types of microcalcifications. The study is carried out by simulating a CSCT system with a scanning pencil beam, considering a polychromatic x-ray source and an energy-resolving photon counting detector. In a first step, the multidimensional angle and energy distributed CSCT data is reduced to the projection-space distributions of only a few components, corresponding to the expected target composition: adipose, glandular tissue, weddellite (calcium oxalate) for type I calcifications, and hydroxyapatite for type II calcifications...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28090588/quantitative-magnetization-transfer-imaging-of-the-breast-at-3-0-t-reproducibility-in-healthy-volunteers
#2
Lori R Arlinghaus, Richard D Dortch, Jennifer G Whisenant, Hakmook Kang, Richard G Abramson, Thomas E Yankeelov
Quantitative magnetization transfer magnetic resonance imaging provides a means for indirectly detecting changes in the macromolecular content of tissue noninvasively. A potential application is the diagnosis and assessment of treatment response in breast cancer; however, before quantitative magnetization transfer imaging can be reliably used in such settings, the technique's reproducibility in healthy breast tissue must be established. Thus, this study aims to establish the reproducibility of the measurement of the macromolecular-to-free water proton pool size ratio (PSR) in healthy fibroglandular (FG) breast tissue...
December 2016: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28089429/diagnosis-and-quantification-of-fibrosis-steatosis-and-hepatic-siderosis-through-multiparametric-magnetic-resonance-imaging
#3
M Stoopen-Rometti, E R Encinas-Escobar, C R Ramirez-Carmona, E Wolpert-Barraza, E Kimura-Hayama, L A Sosa-Lozano, R Favila, Y Kimura-Fujikami, J A Saavedra-Abril, A Loaeza-Del Castillo
BACKGROUND: The presence of liver fibrosis is the common denominator in numerous chronic liver diseases that can progress to fibrosis and hepatocellular carcinoma. Most important, with respect to frequency, are viral hepatitis and non-alcoholic fatty liver disease, the prevalence of which is increasing in epidemic proportions. Liver biopsy, albeit imperfect, continues to be the criterion standard, but in many clinical situations tends to be replaced with noninvasive imaging methods. OBJECTIVES: The aim of the present article was to describe our imaging department experience with magnetic resonance elastography and to analyze and discuss recently published results in gastroenterology, hepatology, and radiology from other authors in the literature, complemented with a PubMed search covering the last 10 years...
January 12, 2017: Revista de Gastroenterología de México
https://www.readbyqxmd.com/read/28089129/kinematic-magnetic-resonance-imaging-of-peroneal-tendon-subluxation-with-intraoperative-correlation
#4
Michael D VanPelt, Matthew R Landrum, Matthew Igbinigie, Vibhor Wadhwa, Avneesh Chhabra
Magnetic resonance imaging (MRI) is a noninvasive modality of choice for the detection of static peroneal tendon pathologic features. The depiction of peroneal tendon subluxation using real-time kinematic MRI has not been previously reported. We describe the MRI and intraoperative correlation of peroneal tendon and retinacular pathologic findings, and the novel use of kinematic MRI in the illustration of peroneal tendon subluxation.
January 6, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28088288/a-novel-mouse-model-of-staphylococcus-aureus-vascular-graft-infection-noninvasive-imaging-of-biofilm-development-in%C3%A2-vivo
#5
Hélène Van de Vyver, Philipp R Bovenkamp, Verena Hoerr, Katrin Schwegmann, Lorena Tuchscherr, Silke Niemann, Laura Kursawe, Christina Grosse, Annette Moter, Uwe Hansen, Ute Neugebauer, Michael T Kuhlmann, Georg Peters, Sven Hermann, Bettina Löffler
Staphylococcus aureus causes very serious infections of vascular grafts. Knowledge of the molecular mechanisms of this disease is largely lacking because of the absence of representable models. Therefore, the aim of this study was to set up a mouse model of vascular graft infections that closely mimics the human situation. A catheter was inserted into the right carotid artery of mice, which acted as a vascular graft. Mice were infected i.v. using 8 different S. aureus strains, and development of the infection was followed up...
January 4, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28081214/cold-pressor-stress-cardiac-magnetic-resonance-myocardial-flow-reserve-is-not-useful-for-detection-of-coronary-endothelial-dysfunction-in-women-with-signs-and-symptoms-of-ischemia-and-no-obstructive-cad
#6
Sofy Landes, Sherwin Dela Cruz, Janet Wei, Ahmed AlBadri, Chrisandra Shufelt, Puja Mehta, Louise E Thomson, Marcio A Diniz, Xiao Zhang, John W Petersen, R David Anderson, Carl J Pepine, Daniel S Berman, C Noel Bairey Merz
BACKGROUND: Coronary endothelial function testing using acetylcholine is not routinely available, while non-pharmacological cold pressor testing (CPT) is considered an endothelial stressor. Noninvasive cardiac magnetic resonance imaging (CMRI) myocardial perfusion reserve index (MPRI) can detect coronary microvascular dysfunction (CMD). We evaluated if CPT stress CMRI MPRI could detect invasive coronary endothelial dysfunction. METHODS: Coronary reactivity testing was performed in 189 women with symptoms and signs of ischemic but no obstructive coronary artery disease as previously described plus CPT stress...
2017: PloS One
https://www.readbyqxmd.com/read/28080913/liver-ultrasonography-in-dolphins-use-of-ultrasonography-to-establish-a-technique-for-hepatobiliary-imaging-and-to-evaluate-metabolic-disease-associated-liver-changes-in-bottlenose-dolphins-tursiops-truncatus
#7
Kelsey E Seitz, Cynthia R Smith, Stanley L Marks, Stephanie K Venn-Watson, Marina Ivančić
The objective of this study was to establish a comprehensive technique for ultrasound examination of the dolphin hepatobiliary system and apply this technique to 30 dolphins to determine what, if any, sonographic changes are associated with blood-based indicators of metabolic syndrome (insulin greater than 14 μIU/ml or glucose greater than 112 mg/dl) and iron overload (transferrin saturation greater than 65%). A prospective study of individuals in a cross-sectional population with and without elevated postprandial insulin levels was performed...
December 2016: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28079715/from-k-space-to-nucleotide-insights-into-the-radiogenomics-of-brain-tumors
#8
Nabil Elshafeey, Islam Hassan, Pascal O Zinn, Rivka R Colen
Radiogenomics is a relatively new and exciting field within radiology that links different imaging features with diverse genomic events. Genomics advances provided by the Cancer Genome Atlas and the Human Genome Project have enabled us to harness and integrate this information with noninvasive imaging phenotypes to create a better 3-dimensional understanding of tumor behavior and biology. Beyond imaging-histopathology, imaging genomic linkages provide an important layer of complexity that can help in evaluating and stratifying patients into clinical trials, monitoring treatment response, and enhancing patient outcomes...
January 11, 2017: Topics in Magnetic Resonance Imaging: TMRI
https://www.readbyqxmd.com/read/28079713/interrogating-idh-mutation-in-brain-tumor-magnetic-resonance-and-hyperpolarization
#9
Jingzhe Hu, Travis C Salzillo, Napapon Sailasuta, Frederick F Lang, Pratip Bhattacharya
Magnetic resonance spectroscopy (MRS) offers the possibility to noninvasively quantify 2HG concentration in the brain in the clinic, thereby serving as a valuable tool for patient-stratification as well as targeted treatment monitoring. Recently, hyperpolarized magnetic resonance techniques have opened up new opportunities for metabolic imaging not possible with conventional MRS in the brain. With over 10,000-fold increase in signal-to-noise ratio (SNR), dynamic metabolic processes can be interrogated in vivo with very high specificity by hyperpolarized MRI...
January 11, 2017: Topics in Magnetic Resonance Imaging: TMRI
https://www.readbyqxmd.com/read/28079351/effect-of-age-on-outcomes-and-practice-patterns-for-patients-with-anterior-communicating-artery-aneurysms
#10
Federico Cagnazzo, Waleed Brinjikji, Giuseppe Lanzino
BACKGROUND: With widespread utilization of noninvasive imaging, small enraptured anterior communicating artery (AcoA) aneurysms are increasingly detected in the general population, particularly in elderly patients. We investigated the association between age and clinical characteristics and outcomes of patients with unruptured AcoA aneurysms. METHODS: Between January 2008 and May 2016, information on 179 consecutive patients with unruptured AcoA aneurysms was obtained and included demographic data, aneurysm features, risk factors for formation and rupture, treatment type, complications, and follow-up information...
January 12, 2017: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/28077373/determination-of-renal-function-and-injury-using-near-infrared-fluorimetry-in-experimental-cardiorenal-syndrome
#11
Mizuko Ikeda, Rumie Wakasaki, Katie J Schenning, Thomas Swide, Jeong Heon Lee, M Bernie Miller, Hak Soo Choi, Sharon Anderson, Michael P Hutchens
Cardiorenal syndrome type 1 causes acute kidney injury but is poorly understood; animal models and diagnostic aids are lacking. Robust noninvasive measurements of glomerular filtration rate are required for injury models and clinical use. Several have been described but are untested in translational models and suffer from biologic interference. We developed a mouse model of cardiorenal syndrome and tested the novel near-infrared fluorophore, ZW800-1, to assess renal and cardiac function. We performed murine cardiac arrest and cardiopulmonary resuscitation followed by transthoracic echocardiography, 2- and 24h later...
January 11, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28076003/reducing-functional-mr-imaging-acquisition-times-by-optimizing-workflow
#12
Wilson B Chwang, Michael Iv, Jason Smith, Aleksandrs Kalnins, Jake Mickelsen, Roland Bammer, Dominik Fleischmann, David B Larson, Max Wintermark, Michael Zeineh
Functional magnetic resonance (MR) imaging is a complex, specialized examination that is able to noninvasively measure information critical to patient care such as hemispheric language lateralization ( 1 ). Diagnostic functional MR imaging requires extensive patient interaction as well as the coordinated efforts of the entire health care team. We observed in our practice at an academic center that the times to perform functional MR imaging examinations were excessively lengthy, making scheduling of the examination difficult...
January 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28075559/one-component-supramolecular-filament-hydrogels-as-theranostic-label-free-magnetic-resonance-imaging-agents
#13
Lye Lin Lock, Yuguo Li, Xinpei Mao, Hanwei Chen, Verena Staedtke, Renyuan Bai, Wang Ma, Ran Lin, Yi Li, Guanshu Liu, Honggang Cui
Gadolinium (Gd)-based compounds and materials are the most commonly used magnetic resonance imaging (MRI) contrast agents in the clinic; however, safety concerns associated with their toxicities in the free ionic form have promoted the development of new generations of metal-free contrast agents. Here we report a supramolecular strategy to convert an FDA-approved anticancer drug, Pemetrexed (Pem), to a molecular hydrogelator with inherent chemical exchange saturation transfer (CEST) MRI signals. The rationally designed drug-peptide conjugate can spontaneously associate into filamentous assemblies under physiological conditions and consequently form theranostic supramolecular hydrogels for injectable delivery...
January 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28074821/acyanotic-congenital-heart-disease-and-transesophageal-echocardiography
#14
REVIEW
Rupa Sreedhar
The spectrum of congenital heart disease (CHD) seen in the adult varies widely. Malformations range from mild anomalies requiring no intervention to extremely complex pathologies characterized by the presence of multiple coexistent defects. Echocardiography represents the primary noninvasive imaging modality in the assessment of these lesions. The transesophageal approach expands the applications of echocardiography by allowing the acquisition of anatomic and functional information that may not be obtainable by transthoracic imaging...
January 2017: Annals of Cardiac Anaesthesia
https://www.readbyqxmd.com/read/28073202/pseudoaneurysm-with-arteriovenous-fistula-of-the-prostate-after-pelvic-trauma-ultrasound-imaging
#15
Andrea B Galosi, Camilla Capretti, Luca Leone, Marco Tiroli, Daniele Cantoro, Massimo Polito
Pseudoaneurysm (PA) associated with an arteriovenous fistula (AVF) of the internal pudendal artery branches are very uncommon. We report a case of post-traumatic PA with AVF connected to Santorini plexus. Diagnosis was made with trans-rectal ultrasound (TRUS) after recurrent hematuria. TRUS reported a 1.7 × 1.4 × 1.5 cm anechoic area, on anterior prostate apex close to Santorini plexus. The use of color Doppler in this area revealed high flow velocity that was indicative for AVF. The feeding artery was a distal branch of the left pudenda artery...
December 30, 2016: Archivio Italiano di Urologia, Andrologia
https://www.readbyqxmd.com/read/28072912/temperature-mapping-in-hydrogel-matrices-using-unmodified-digital-camera
#16
Ghinwa H Darwish, Hassan H Fakih, Pierre Karam
We report a simple, generally applicable and noninvasive fluorescent method for mapping thermal fluctuations in hydrogel matrices using an unmodified commercially available digital single-lens reflex camera (DSLR). The nanothermometer is based on the complexation of short conjugated polyelectrolytes, poly-(phenylene ethynylene) carboxylate, with an amphiphilic polymer, polyvinylpyrrolidone, which is in turn trapped within the porous network of a gel matrix. Changes in the temperature lead to a fluorescent ratiometric response with a maximum relative sensitivity of 2...
January 10, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28070734/significant-correlation-between-renal-123-i-metaiodobenzylguanidine-scintigraphy-and-muscle-sympathetic-nerve-activity-in-patients-with-primary-hypertension
#17
Masayuki Takamura, Hisayoshi Murai, Yoshitaka Okabe, Yuji Okuyama, Takuto Hamaoka, Yusuke Mukai, Hideki Tokuhisa, Oto Inoue, Shin-Ichiro Takashima, Takeshi Kato, Shinro Matsuo, Soichiro Usui, Hiroshi Furusho, Shuichi Kaneko
BACKGROUND: Iodine-123 metaiodobenzylguanidine ((123)I-MIBG) scintigraphy is used as a noninvasive imaging method for assessing cardiac sympathetic nerve activity. We tested the hypothesis that renal (123)I-MIBG imaging is correlated with muscle sympathetic nerve activity (MSNA) in patients with primary hypertension. METHODS: Thirty-one consecutive patients with primary hypertension were included. Multiunit MSNA was recorded from the peroneal nerve to evaluate direct efferent sympathetic nerve activity...
January 9, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28069511/in-vivo-characterization-of-magnesium-alloy-biodegradation-using-electrochemical-h2-monitoring-icp-ms-and-xps
#18
Daoli Zhao, Tingting Wang, Keaton Nahan, Xuefei Guo, Zhanping Zhang, Zhongyun Dong, Shuna Chen, Da-Tren Chou, Daeho Hong, Prashant N Kumta, William R Heineman
: The effect of widely different corrosion rates of Mg alloys on four parameters of interest for in vivo characterization was evaluated: (1) the effectiveness of transdermal H2 measurements with an electrochemical sensor for noninvasively monitoring biodegradation compared to the standard techniques of in vivo X-ray imaging and weight loss measurement of explanted samples, (2) the chemical compositions of the corrosion layers of the explanted samples by XPS, (3) the effect on animal organs by histology, and (4) the accumulation of corrosion by-products in multiple organs by ICP-MS...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28068522/motor-evoked-potential-gain-is-a-helpful-test-for-the-detection-of-corticospinal-tract-dysfunction-in-amyotrophic-lateral-sclerosis
#19
Y Duclos, A M Grapperon, E Jouve, R Truillet, C Zemmour, A Verschueren, J Pouget, S Attarian
OBJECTIVE: The detection of upper motor neuron (UMN) dysfunction is necessary for the diagnosis of amyotrophic lateral sclerosis (ALS). However, signs of UMN dysfunction may be difficult to establish. This study aimed to determine whether motor-evoked potential (MEP) gain (MEP area/background electromyographic activity) represents an efficient alternative to assess UMN dysfunction. METHODS: MEP area, MEP/compound muscle action potential (CMAP) area ratio, and MEP gain were tested at different force levels in healthy control subjects and ALS patients...
December 23, 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28068482/metabolic-reprogramming-in-brain-tumors
#20
Sriram Venneti, Craig B Thompson
Next-generation sequencing has substantially enhanced our understanding of the genetics of primary brain tumors by uncovering several novel driver genetic alterations. How many of these genetic modifications contribute to the pathogenesis of brain tumors is not well understood. An exciting paradigm emerging in cancer biology is that oncogenes actively reprogram cellular metabolism to enable tumors to survive and proliferate. We discuss how some of these genetic alterations in brain tumors rewire metabolism...
December 21, 2016: Annual Review of Pathology
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