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https://www.readbyqxmd.com/read/28321471/feasibility-of-in-vivo-18-f-florbetaben-pet-mr-imaging-of-human-carotid-amyloid-%C3%AE
#1
Jan Bucerius, Henryk Barthel, Solveig Tiepolt, Peter Werner, Judith C Sluimer, Joachim E Wildberger, Marianne Patt, Swen Hesse, Hermann-Josef Gertz, Erik A L Biessen, Felix M Mottaghy, Osama Sabri
PURPOSE: Amyloid-beta (Aβ) peptides are involved in the inflammatory pathology of atherosclerosis. (18)F-Florbetaben is a PET tracer for clinical imaging of cerebral Aβ plaques in Alzheimer's disease (AD). We sought to determine whether specific uptake of (18)F-florbetaben in the carotid arteries can be identified using a fully integrated hybrid PET/MRI system and whether this uptake is associated with clinical cardiovascular disease (CVD) risk factors. METHODS: Carotid (18)F-florbetaben uptake was quantified as the mean of the maximum target-to-background ratio (meanTBRmax) in 40 cognitively impaired subjects (age 68...
March 21, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28275562/a-comprehensive-literatures-update-of-clinical-researches-of-superparamagnetic-resonance-iron-oxide-nanoparticles-for-magnetic-resonance-imaging
#2
REVIEW
Yì Xiáng J Wáng, Jean-Marc Idée
This paper aims to update the clinical researches using superparamagnetic iron oxide (SPIO) nanoparticles as magnetic resonance imaging (MRI) contrast agent published during the past five years. PubMed database was used for literature search, and the search terms were (SPIO OR superparamagnetic iron oxide OR Resovist OR Ferumoxytol OR Ferumoxtran-10) AND (MRI OR magnetic resonance imaging). The literature search results show clinical research on SPIO remains robust, particularly fuelled by the approval of ferumoxytol for intravenously administration...
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28256903/mr-imaging-in-patients-with-male-to-female-sex-reassignment-surgery-postoperative-anatomy-and-complications
#3
Michele Bertolotto, Giovanni Liguori, Stefano Bucci, Mariano Iannelli, Francesca Vedovo, Nicola Pavan, Carlo Trombetta, Lorenzo E Derchi
OBJECTIVE: To investigate the role of MRI in the evaluation of both the new female anatomy and complications in male-to-female sex reassignment surgery (MtF-SRS). METHODS: 71 consecutive patients with MtF-SRS had 74 MRI [age range, 21-63 years; mean (±standard deviation) age, 36 ± 10 years; median age, 37 years]. In 47 patients, MRI was performed to rule out early post-operative complications after gender conversion (n = 40), vaginoplasty (n = 6) or remodelling of the labia majora (n = 1)...
April 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28252427/renal-function-markers-for-long-term-cardiovascular-prediction-in-individuals-after-myocardial-revascularization
#4
E Levitskaya
Goal - assessment of the renal dysfunction impact on the probability of cardiovascular complications development in the long-term period after myocardial revascularization. 90 patients with ischemic heart disease (IHD) and myocardial revascularization indications were involved in the study. All the patients underwent coronary angiography (CAG), by determining the method of myocardial revascularization (MR) - coronary artery bypass grafting or coronary artery stenting. Traditional risk factors and renal dysfunction markers (albuminuria in the range of 30-300 mg/L, β2-microglobulinuria) were revealed in all the patients examined...
January 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28245785/vascular-consequences-of-aldosterone-excess-and-mineralocorticoid-receptor-antagonism
#5
Sophocles Chrissobolis
Aldosterone binds to mineralocorticoid receptors (MRs) on renal epithelial cells to regulate sodium and water reabsorption, and therefore blood pressure. Recently, the actions of aldosterone outside the kidney have been extensively investigated, with numerous reports of aldosterone having detrimental actions, including in the vasculature. Notably, elevated aldosterone levels are an independent cardiovascular risk factor, and in addition to causing an increase in blood pressure, aldosterone can have blood pressure-dependent and -independent effects commonly manifested in the vasculature in cardiovascular diseases, including vascular oxidative stress, endothelial dysfunction, inflammation, remodeling, stiffening, and plaque formation...
February 28, 2017: Current Hypertension Reviews
https://www.readbyqxmd.com/read/28216518/optimization-of-t1-weighted-imaging-parameters-in-mr-carotid-plaque-imaging-influence-for-the-quantitative-evaluation-among-different-mri-scanner-types
#6
Takanori Naka, Mitsuyuki Takahashi, Koutarou Takeda, Tarou Igarashi, Tetsukazu Hondera
Carotid artery plaques with high-signal intensity on T1 weighted image (T1 WI) are known to cause cerebral ischemic disease. Signal intensity ratio (SIR), which is calculated from T1 WI in the quantitative evaluation of plaque characterization have been used. However, the various sequences in T1 WI and difference in the sequences were utilized among institutions. Therefore, difference in sequence may influence SIR. The purpose of this study was to evaluate the optimization of T1 WI sequence in MR carotid plaque imaging...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28109921/coronary-artery-pet-mr-imaging-feasibility-limitations-and-solutions
#7
Philip M Robson, Marc R Dweck, Maria Giovanna Trivieri, Ronan Abgral, Nicolas A Karakatsanis, Johanna Contreras, Umesh Gidwani, Jagat P Narula, Valentin Fuster, Jason C Kovacic, Zahi A Fayad
OBJECTIVES: The aims of this study were to describe the authors' initial experience with combined coronary artery positron emission tomographic (PET) and magnetic resonance (MR) imaging using (18)F-fluorodeoxyglucose ((18)F-FDG) and (18)F-sodium fluoride ((18)F-NaF) radiotracers, describe common problems and their solutions, and demonstrate the feasibility of coronary PET/MR imaging in appropriate patients. BACKGROUND: Recently, PET imaging has been applied to the aortic valve and regions of atherosclerosis...
January 13, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28089144/essential-role-of-icam-1-in-aldosterone-induced-atherosclerosis
#8
Vincenzo Marzolla, Andrea Armani, Caterina Mammi, Mary E Moss, Vittoria Pagliarini, Laura Pontecorvo, Antonella Antelmi, Andrea Fabbri, Giuseppe Rosano, Iris Z Jaffe, Massimiliano Caprio
OBJECTIVE: Elevated aldosterone is associated with increased risk of atherosclerosis complications, whereas treatment with mineralocorticoid receptor (MR) antagonists decreases the rate of cardiovascular events. Here we test the hypothesis that aldosterone promotes early atherosclerosis by modulating intercellular adhesion molecule-1 (ICAM-1) expression and investigate the molecular mechanisms by which aldosterone regulates ICAM-1 expression. METHODS AND RESULTS: Apolipoprotein-E (ApoE)(-/-) mice fed an atherogenic diet and treated with aldosterone for 4weeks showed increased vascular expression of ICAM-1, paralleled by enhanced atherosclerotic plaque size in the aortic root...
April 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28071288/vulnerable-carotid-plaque-imaging-and-histopathology-without-a-dedicated-mri-receiver-coil
#9
Laura A Fitzpatrick, Nadav Berkovitz, Marlise P Dos Santos, Nevin Majeed, Rafael Glikstein, Santanu Chakraborty, John P Veinot, Grant Stotts, Alain Berthiaume, Robert Chatelain
Stroke is associated with vulnerable carotid artery plaques showing specific histopathologic features, namely a lipid-rich necrotic core, intraplaque hemorrhage, ulceration, and thin fibrous cap. While ultrasound and computed tomography (CT) can identify carotid plaques and determine the extent of stenosis, magnetic resonance imaging (MRI) provides further information regarding plaque composition and morphology. In this feasibility study, three patients with symptomatic, moderately stenosed plaques were imaged with CT angiography (CTA) and MRI (3T and 1...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28056476/-advanced-systemic-sclerosis-endovascular-reconstruction-of-the-aortic-bifurcation-for-limb-salvage
#10
Florian Stein, Lars Kamper, Konstantinos Meletiadis, Ulrich Kusenack, Patrick Haage
History and admission findings A 69-year-old patient was initially hospitalized because of a 1.5 cm ulceration at the back of the right foot which had existed for the last year and become increasingly swollen and painful. Medical history revealed PmScl-positive systemic sclerosis presenting with a massive calcinosis cutis, advanced pulmonary fibrosis and peripheral artery disease. Examinations Inflammatory markers were normal. MR-Angiography of the lower extremities revealed a multi-segmental high-grade stenosis of the aortic bifurcation due to extensively calcified plaques...
January 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/28049656/hdl-efflux-capacity-hdl-particle-size-and-high-risk-carotid-atherosclerosis-in-a-cohort-of-asymptomatic-older-adults-the-chicago-healthy-aging-study
#11
R Kannan Mutharasan, C Shad Thaxton, Jarett Berry, Martha L Daviglus, Chun Yuan, Jie Sun, Colby Ayers, Donald M Lloyd-Jones, John T Wilkins
HDL efflux capacity and HDL particle size are associated with atherosclerotic CVD (ASCVD) events in middle-aged individuals; however, it is unclear whether these associations are present in older adults. We sampled 402 Chicago Healthy Aging Study participants who underwent a dedicated carotid MRI assessment for lipid-rich necrotic core (LRNC) plaque. We measured HDL particle size, HDL particle number, and LDL particle number with NMR spectroscopy, as well as HDL efflux capacity. We quantified the associations between HDL particle size and HDL efflux using adjusted linear regression models...
March 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28038775/spinal-cord-lesions-in-children-and-adolescents-with-multiple-sclerosis-magnetic-resonance-imaging
#12
Joanna Dębska, Katarzyna Kotulska-Józwiak, Piotr Pawliszak, Małgorzata Bilska, Dariusz Chmielewski, Iwona Puzio, Elżbieta Jurkiewicz
PURPOSE: The purpose of our study was to determine the prevalence of spinal cord lesions revealed by magnetic resonance (MR) imaging in children and adolescents with clinically definite multiple sclerosis (MS). MATERIAL AND METHODS: We retrospectively evaluated the spinal cord magnetic resonance examinations in a group of MS patients consisting of 58 children (37 girls and 21 boys) aged from 7 to 17.8 years (mean 13.7 years). All children met the criteria of clinically definite MS and had typical MS lesions revealed in the brain imaging...
December 14, 2016: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/27989910/a-32-channel-coil-system-for-mr-vessel-wall-imaging-of-intracranial-and-extracranial-arteries-at-3t
#13
Xiaoqing Hu, Ye Li, Lei Zhang, Xiaoliang Zhang, Xin Liu, Yiu-Cho Chung
PURPOSE: To develop a RF coil system for joint imaging of intracranial and extracranial arterial vessel wall at 3T. MATERIALS AND METHOD: The coil system consists of a 24-channel head coil combined with an 8-channel carotid coil. It is compared with a standard coil configuration (12-channel head coil+4-channel neck coil+8-channel carotid coil) for SNR and g-factors in phantoms and healthy volunteers. The clinical relevance of the proposed coil system is also evaluated in patients...
October 27, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27932506/synthetic-mri-in-the-detection-of-multiple-sclerosis-plaques
#14
A Hagiwara, M Hori, K Yokoyama, M Y Takemura, C Andica, T Tabata, K Kamagata, M Suzuki, K K Kumamaru, M Nakazawa, N Takano, H Kawasaki, N Hamasaki, A Kunimatsu, S Aoki
BACKGROUND AND PURPOSE: Synthetic MR imaging enables the creation of various contrast-weighted images including double inversion recovery and phase-sensitive inversion recovery from a single MR imaging quantification scan. Here, we assessed whether synthetic MR imaging is suitable for detecting MS plaques. MATERIALS AND METHODS: Quantitative and conventional MR imaging data on 12 patients with MS were retrospectively analyzed. Synthetic T2-weighted, FLAIR, double inversion recovery, and phase-sensitive inversion recovery images were produced after quantification of T1 and T2 values and proton density...
December 8, 2016: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/27908279/co-existing-intracranial-and-extracranial-carotid-artery-atherosclerotic-plaques-and-recurrent-stroke-risk-a-three-dimensional-multicontrast-cardiovascular-magnetic-resonance-study
#15
Yilan Xu, Chun Yuan, Zechen Zhou, Le He, Donghua Mi, Rui Li, Yuanyuan Cui, Yilong Wang, Yongjun Wang, Gaifen Liu, Zhuozhao Zheng, Xihai Zhao
BACKGROUND: As a systemic disease, atherosclerosis commonly affects intracranial and extracranial carotid arteries simultaneously which is defined as co-existing plaques. Previous studies demonstrated that co-existing atherosclerotic diseases are significantly associated with ischemic cerebrovascular events. The aim of this study was to investigate the characteristics of co-existing intracranial and extracranial carotid atherosclerotic plaques and their relationships with recurrent stroke by using 3D multi-contrast magnetic resonance (MR) vessel wall imaging...
December 2, 2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27881672/mineralocorticoid-receptor-deficiency-in-macrophages-inhibits-atherosclerosis-by-affecting-foam-cell-formation-and-efferocytosis
#16
Zhu-Xia Shen, Xiao-Qing Chen, Xue-Nan Sun, Jian-Yong Sun, Wu-Chang Zhang, Xiao-Jun Zheng, Yu-Yao Zhang, Huan-Jing Shi, Jia-Wei Zhang, Chao Li, Jun Wang, Xu Liu, Sheng-Zhong Duan
Mineralocorticoid receptor (MR) has been considered as a potential target for treating atherosclerosis. However, the cellular and molecular mechanisms are not completely understood. We aim to explore the functions and mechanisms of macrophage MR in atherosclerosis. Atherosclerosis-susceptible LDLRKO chimeric mice with bone marrow cells from floxed control mice or from myeloid MR knock-out (MRKO) mice were generated and fed with high cholesterol diet. Oil red O staining showed that MRKO decreased atherosclerotic lesion area in LDLRKO mice...
January 20, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27881291/assessment-of-carotid-plaque-inflammation-in-diabetic-and-nondiabetic-patients-an-exploratory-ultrasmall-superparamagnetic-iron-oxide-enhanced-magnetic-resonance-imaging-study
#17
Ammara Usman, Andrew J Patterson, Umar Sadat, Tjun Y Tang, Martin J Graves, Jonathan H Gillard
BACKGROUND: Ultrasmall superparamagnetic iron oxide (USPIO)-enhanced magnetic resonance (MR) imaging enables the identification of inflammation within the atheroma, predominantly by USPIO uptake by macrophages present in atherosclerotic tissue. Diabetic patients, however, may have dysfunctional macrophage activity, which may affect utilization of USPIO in identifying plaque inflammation in this patient cohort. METHODS: Fifteen diabetic and fifteen nondiabetic patients underwent USPIO-enhanced carotid MR imaging using 1...
November 21, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/27878405/a-comparison-study-between-3d-t2-weighted-space-and-conventional-2d-t2-weighted-turbo-spin-echo-in-assessment-of-carotid-plaque
#18
Peng Lv, Yuanyuan Dai, Jiang Lin, Weisheng Zhang, Hao Liu, Hui Liu, Xiao Tang
The aim of this study was to compare 3D T2-weighted sampling perfection with application optimized contrast using different flip angle evolutions (T2w SPACE) with conventional 2D T2w turbo-spin echo (TSE) in plaque imaging of carotid artery. 45 patients underwent 3.0-T MRI for carotid arteries imaging. MR sequences included T2w SPACE, T2w TSE, Time of flight (TOF) and T1-weighted (T1w) TSE. The signal intensity of intra-plaque hemorrhage (IPH), lipid-rich necrotic core (LRNC), and loose matrix (LM) were measured and their contrast ratios (CRs) against adjacent muscle were calculated...
November 22, 2016: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/27875002/superparamagnetic-nanoparticle-enhanced-mri-of-alzheimer-s-disease-plaques-and-activated-microglia-in-3x-transgenic-mouse-brains-contrast-optimization
#19
Marissa A Tafoya, Saaussan Madi, Laurel O Sillerud
PURPOSE: To optimize magnetic resonance imaging (MRI) of antibody-conjugated superparamagnetic nanoparticles for detecting amyloid-β plaques and activated microglia in a 3X transgenic mouse model of Alzheimer's disease. MATERIALS AND METHODS: Ten 3X Tg mice were fed either chow or chow containing 100 ppm resveratrol. Four brains, selected from animals injected with either anti-amyloid targeted superparamagnetic iron oxide nanoparticles, or anti-Iba-1-conjugated FePt-nanoparticles, were excised, fixed with formalin, and placed in Fomblin for ex vivo MRI (11...
November 22, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27856437/quantifying-intracranial-plaque-permeability-with-dynamic-contrast-enhanced-mri-a-pilot-study
#20
P Vakil, A H Elmokadem, F H Syed, C G Cantrell, F H Dehkordi, T J Carroll, S A Ansari
BACKGROUND AND PURPOSE: Intracranial atherosclerotic disease plaque hyperintensity and/or gadolinium contrast enhancement have been studied as imaging biomarkers of acutely symptomatic ischemic presentations using single static MR imaging measurements. However, the value in modeling the dynamics of intracranial plaque permeability has yet to be evaluated. The purpose of this study was to use dynamic contrast-enhanced MR imaging to quantify the contrast permeability of intracranial atherosclerotic disease plaques in symptomatic patients and to compare these parameters against existing markers of plaque volatility using black-blood MR imaging pulse sequences...
February 2017: AJNR. American Journal of Neuroradiology
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