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Phase contrast Magnetic

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https://www.readbyqxmd.com/read/28635249/perfluorocarbon-gold-loading-for-non-invasive-in-vivo-assessment-of-bone-fillers-using-19f-magnetic-resonance-imaging-and-computed-tomography
#1
Simone Mastrogiacomo, Weiqiang Dou, Olga Koshkina, Otto C Boerman, John A Jansen, Arend Heerschap, Mangala Srinivas, X Frank Walboomers
Calcium phosphate cement (CPC) is used in bone repair because of its biocompatibility. However, high similarity between CPC and the natural osseous phase results in poor image contrast in most of the available in vivo imaging techniques such as computed tomography (CT) and magnetic resonance imaging (MRI). For accurate identification and localization during and after implantation in vivo, a composition with enhanced image contrast is needed. In this study, we labeled CPC with perfluoro-15-crown-5-ether-loaded (PFCE) poly(latic-co-glycolic acid) nanoparticles (hydrodynamic radius 100 nm) and gold nanoparticles (diameter 40 nm), as 19F MRI and CT contrast agents respectively...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28632786/diagnostic-accuracy-of-magnetic-resonance-computed-tomography-and-contrast-enhanced-ultrasound-in-radiological-multimodality-assessment-of-peribiliary-liver-metastases
#2
Vincenza Granata, Roberta Fusco, Orlando Catalano, Antonio Avallone, Raffaele Palaia, Gerardo Botti, Fabiana Tatangelo, Francesco Granata, Marco Cascella, Francesco Izzo, Antonella Petrillo
PURPOSE: We compared diagnostic performance of Magnetic Resonance (MR), Computed Tomography (CT) and Ultrasound (US) with (CEUS) and without contrast medium to identify peribiliary metastasis. METHODS: We identified 35 subjects with histological proven peribiliary metastases who underwent CEUS, CT and MR study. Four radiologists evaluated the presence of peribiliary lesions, using a 4-point confidence scale. Echogenicity, density and T1-Weigthed (T1-W), T2-W and Diffusion Weighted Imaging (DWI) signal intensity as well as the enhancement pattern during contrast studies on CEUS, CT and MR so as hepatobiliary-phase on MRI was assessed...
2017: PloS One
https://www.readbyqxmd.com/read/28632653/imaging-adults-with-congenital-heart-disease-part-ii-advanced-cmr-techniques
#3
Anurag Sahu, Timothy C Slesnick
Because of great strides in medical care, survival into adulthood has become a common expectation in patients suffering from nearly all forms of congenital heart disease. As this aging population expands, the utilization of cardiac magnetic resonance imaging in their care continues to grow. Magnetic resonance technology has developed exponentially over the last 2 decades, and several advanced techniques for imaging adults with congenital heart disease have moved from the purely research arena into routine clinical care...
July 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28627999/heritability-and-genome-wide-associations-studies-of-cerebral-blood-flow-in-the-general-population
#4
M Arfan Ikram, Hazel I Zonneveld, Gennady Roshchupkin, Albert V Smith, Oscar H Franco, Sigurdur Sigurdsson, Cornelia van Duijn, André G Uitterlinden, Lenore J Launer, Meike W Vernooij, Vilmundur Gudnason, Hieab Hh Adams
Cerebral blood flow is an important process for brain functioning and its dysregulation is implicated in multiple neurological disorders. While environmental risk factors have been identified, it remains unclear to what extent the flow is regulated by genetics. Here we performed heritability and genome-wide association analyses of cerebral blood flow in a population-based cohort study. We included 4472 persons free of cortical infarcts who underwent genotyping and phase-contrast magnetic resonance flow imaging (mean age 64...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28626199/oxygen-and-glucose-as-stimulation-agents-for-bold-functional-mr-imaging-of-rabbit-liver-a-feasibility-study
#5
Fang Yuan, Bin Song, Zixing Huang, Xijiao Liu, Chunchao Xia
PURPOSE: To assess the feasibility of using oxygen and glucose as stimulating agents in blood-oxygen-level-dependent (BOLD) Functional Magnetic Resonance Imaging (fMRI) of rabbit liver and analyze the impacts by blood flow. METHODS: Pure oxygen inhalation, intravenous injection and oral administration of glucose were given to 11 New Zealand white rabbits to compare the differences of liver T2*, aortic flow (AF), portal vein flow (PVF), aortic area (AA) and portal vein area (PVA) before and at 5 min, 10 min, 20 min, 30 min after administrations...
June 16, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28624566/4d-phase-contrast-mri-protocol-optimization-using-patient-specific-3d-printed-replicas-for-in-vivo-imaging-before-and-after-flow-diverter-placement
#6
Christof Karmonik, Jeff R Anderson, Saba Elias, Richard Klucznik, Orlando Diaz, Y Jonathan Zhang, Robert G Grossman, Gavin W Britz
PURPOSE: Hemodynamics in cerebral aneurysms is currently investigated towards its clinical efficacy using non-standardized computational simulation techniques. At the same time, flow patterns and velocities are accessible by 4D phase contrast magnetic resonance imaging (4D pcMRI). Complexity of protocol design and imaging duration has limited the use of this technique in clinical imaging. A new approach is presented to overcome these limitations. MATERIAL AND METHODS: 3D replicas of two cerebral aneurysms were fabricated by fused deposition prototyping (3D printing) and imaged using 4D pcMRI while connected to an MRI compatible continuous flow loop...
June 14, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28623496/association-between-flow-skewness-and-aortic-dilatation-in-patients-with-aortic-stenosis
#7
Hojin Ha, Hyun Jung Koo, June Goo Lee, Guk Bae Kim, Jihoon Kweon, Sang Joon Lee, Joon Won Kang, Tae Hwan Lim, Dae Hee Kim, Jong Min Song, Duk Hyun Kang, Jae Kwan Song, Young Hak Kim, Namkug Kim, Dong Hyun Yang
We investigated association between hemodynamic characteristics and aortic dilatation in patients with severe aortic stenosis (AS). Eighty patients with severe AS (mean age, 67.2 ± 12.5 years) who underwent multi-detector computed tomography and phase-contrast magnetic resonance imaging at the ascending aorta were retrospectively analyzed. Patients with an ascending aorta diameter >4 cm had a significantly higher forward flow rate at systole (28.5 ± 6.0 vs. 36.2 ± 8.6 L min, P < 0...
June 16, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28622796/cardiac-magnetic-resonance-indices-reflecting-pulmonary-regurgitation-burden-after-tetralogy-of-fallot-repair
#8
A A Sakrana, S A Al-Zubaidi, M M Nasr, E M Helmy, S S Al Ghamdi, M E Tahlawi
AIM: To investigate cardiac magnetic resonance (CMR)-derived parameters to determine a convenient index reflecting the degree of pulmonary regurgitation (PR) after Tetralogy of Fallot (TOF) repair. MATERIALS AND METHODS: Sixty-three patients (age at CMR study, 23.6 [10.2-34.7] years, 55.6% male) underwent CMR after TOF repair. PR was quantified using ventricular stroke volume difference and phase-contrast mapping of the main pulmonary artery flow. In both approaches, the PRV index (PRVI) and the PR fraction (PRF) were calculated and correlated to the right ventricle end-diastolic volume index (RVEDVI) and the right ventricle end-systolic volume index (RVESVI)...
June 13, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28622412/textural-analysis-of-early-phase-spatiotemporal-changes-in-contrast-enhancement-of-breast-lesions-imaged-with-an-ultrafast-dce-mri-protocol
#9
Jana Milenković, Mehmet Ufuk Dalmış, Janez Žgajnar, Bram Platel
PURPOSE: New ultrafast view-sharing sequences have enabled breast dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) to be performed at high spatial and temporal resolution. The aim of this study is to evaluate the diagnostic potential of textural features that quantify the spatiotemporal changes of the contrast-agent uptake in computer-aided diagnosis of malignant and benign breast lesions imaged with high spatial and temporal resolution DCE-MRI. METHOD: The proposed approach is based on the textural analysis quantifying the spatial variation of six dynamic features of the early-phase contrast-agent uptake of a lesion's largest cross-sectional area...
June 16, 2017: Medical Physics
https://www.readbyqxmd.com/read/28622249/dynamic-liver-magnetic-resonance-imaging-in-free-breathing-feasibility-of-a-cartesian-t1-weighted-acquisition-technique-with-compressed-sensing-and-additional-self-navigation-signal-for-hard-gated-and-motion-resolved-reconstruction
#10
Benjamin Kaltenbach, Andreas M Bucher, Julian L Wichmann, Dominik Nickel, Christoph Polkowski, Renate Hammerstingl, Thomas J Vogl, Boris Bodelle
OBJECTIVES: The aim of this study was to assess the feasibility of a free-breathing dynamic liver imaging technique using a prototype Cartesian T1-weighted volumetric interpolated breathhold examination (VIBE) sequence with compressed sensing and simultaneous acquisition of a navigation signal for hard-gated and motion state-resolved reconstruction. MATERIALS AND METHODS: A total of 43 consecutive oncologic patients (mean age, 66 ± 11 years; 44% female) underwent free-breathing dynamic liver imaging for the evaluation of liver metastases from colorectal cancer using a prototype Cartesian VIBE sequence (field of view, 380 × 345 mm; image matrix, 320 × 218; echo time/repetition time, 1...
June 16, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28620292/dynamic-responses-in-brain-networks-to-social-feedback-a-dual-eeg-acquisition-study-in-adolescent-couples
#11
Ching-Chang Kuo, Thao Ha, Ashley M Ebbert, Don M Tucker, Thomas J Dishion
Adolescence is a sensitive period for the development of romantic relationships. During this period the maturation of frontolimbic networks is particularly important for the capacity to regulate emotional experiences. In previous research, both functional magnetic resonance imaging (fMRI) and dense array electroencephalography (dEEG) measures have suggested that responses in limbic regions are enhanced in adolescents experiencing social rejection. In the present research, we examined social acceptance and rejection from romantic partners as they engaged in a Chatroom Interact Task...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28615663/hydrostatic-pressure-effects-on-the-static-magnetism-in-eu-fe0-925co0-075-2as2
#12
W T Jin, J-P Sun, G Z Ye, Y Xiao, Y Su, K Schmalzl, S Nandi, Z Bukowski, Z Guguchia, E Feng, Z Fu, J-G Cheng
EuFe2As2-based iron pnictides are quite interesting compounds, due to the two magnetic sublattices in them and the tunability to superconductors by chemical doping or application of external pressure. The effects of hydrostatic pressure on the static magnetism in Eu(Fe0.925Co0.075)2As2 are investigated by complementary electrical resistivity, ac magnetic susceptibility and single-crystal neutron diffraction measurements. A specific pressure-temperature (P-T) phase diagram of Eu(Fe0.925Co0.075)2As2 is established...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28609205/diagnostic-performance-of-gadoxetic-acid-enhanced-liver-mr-imaging-versus-multidetector-ct-in-the-detection-of-dysplastic-nodules-and-early-hepatocellular-carcinoma
#13
Bo Ram Kim, Jeong Min Lee, Dong Ho Lee, Jeong Hee Yoon, Bo Yun Hur, Kyung Suk Suh, Nam-Joon Yi, Kyung Boon Lee, Joon Koo Han
Purpose To compare the diagnostic performance of gadoxetic acid-enhanced liver magnetic resonance (MR) imaging with that of contrast material-enhanced multidetector computed tomography (CT) in the detection of borderline hepatocellular nodules in patients with liver cirrhosis and to determine the Liver Imaging Reporting and Data System (LI-RADS) categories of these detected nodules. Materials and Methods The institutional review board approved this retrospective study and waived the informed consent requirement...
June 13, 2017: Radiology
https://www.readbyqxmd.com/read/28608325/pulsatile-flow-leads-to-intimal-flap-motion-and-flow-reversal-in-an-in-vitro-model-of-type-b-aortic-dissection
#14
Joav Birjiniuk, Lucas H Timmins, Mark Young, Bradley G Leshnower, John N Oshinski, David N Ku, Ravi K Veeraswamy
Understanding of the hemodynamics of Type B aortic dissection may improve outcomes by informing upon patient selection, device design, and deployment strategies. This project characterized changes to aortic hemodynamics as the result of dissection. We hypothesized that dissection would lead to elevated flow reversal and disrupted pulsatile flow patterns in the aorta that can be detected and quantified by non-invasive magnetic resonance imaging. Flexible, anatomic models of both normal aorta and dissected aorta, with a mobile intimal flap containing entry and exit tears, were perfused with a physiologic pulsatile waveform...
June 12, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28600877/stepwise-algorithm-using-computed-tomography-and-magnetic-resonance-imaging-for-diagnosis-of-fat-poor-angiomyolipoma-in-small-renal-masses-development-and-external-validation
#15
Hajime Tanaka, Yasuhisa Fujii, Hiroshi Tanaka, Junichiro Ishioka, Yoh Matsuoka, Kazutaka Saito, Sho Uehara, Noboru Numao, Takeshi Yuasa, Shinya Yamamoto, Hitoshi Masuda, Junji Yonese, Kazunori Kihara
OBJECTIVES: To develop a stepwise diagnostic algorithm for fat-poor angiomyolipoma in small renal masses. METHODS: Two cohorts of small renal masses <4 cm without an apparent fat component that was pathologically diagnosed were included: 153 cases (18 fat-poor angiomyolipomas/135 renal cell carcinomas) for model development and 71 cases (seven fat-poor angiomyolipomas/59 renal cell carcinomas/5 oncocytomas) for validation. Dynamic contrast-enhanced computed tomography, magnetic resonance imaging and clinical findings were analyzed...
June 10, 2017: International Journal of Urology: Official Journal of the Japanese Urological Association
https://www.readbyqxmd.com/read/28599831/alterations-in-cardiac-deformation-timing-of%C3%A2-contraction-and-relaxation-and-early-myocardial-fibrosis-accompany-the-apparent-recovery-of-acute-stress-induced-takotsubo-cardiomyopathy-an-end-to-the-concept-of%C3%A2-transience
#16
Konstantin Schwarz, Trevor Ahearn, Janaki Srinivasan, Christopher J Neil, Caroline Scally, Amelia Rudd, Baljit Jagpal, Michael P Frenneaux, Cristina Pislaru, John D Horowitz, Dana K Dawson
BACKGROUND: Takotsubo syndrome is an increasingly recognized cause of chest pain and occasionally of cardiogenic shock. Despite rapid improvement of the left ventricular (LV) ejection fraction, recent registry data raise concerns about long-term prognosis. The aim of this study was to test the hypothesis that restoration of normal ejection fraction after acute takotsubo syndrome is not equivalent to full functional recovery. METHODS: Fifty-two patients with takotsubo syndrome (according to the Mayo Clinic criteria plus cardiac magnetic resonance imaging to exclude myocardial infarction) and 44 healthy control subjects of the same age, gender, and cardiovascular comorbidity distribution were prospectively recruited...
June 6, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28599110/standardizing-size-and-shape-controlled-synthesis-of-monodisperse-magnetite-fe3o4-nanocrystals-by-identifying-and-exploiting-effects-of-organic-impurities
#17
Liang Qiao, Zheng Fu, Ji Li, John Ghosen, Ming Zeng, John Stebbins, Paras N Prasad, Mark T Swihart
Magnetite (Fe3O4) nanocrystals (MNCs) are among the most-studied magnetic nanomaterials, and many reports of solution-phase synthesis of monodisperse MNCs have been published. However, lack of reproducibility of MNC synthesis is a persistent problem, and the keys to producing monodisperse MNCs remain elusive. Here, we define and explore synthesis parameters in this system thoroughly to reveal their effects on the product MNCs. We demonstrate the essential role of benzaldehyde and benzyl benzoate produced by oxidation of benzyl ether, the solvent typically used for MNC synthesis, in producing monodisperse MNCs...
June 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28598900/interleaved-mapping-of-temperature-and-longitudinal-relaxation-rate-to-monitor-drug-delivery-during-magnetic-resonance-guided-high-intensity-focused-ultrasound-induced-hyperthermia
#18
Esther Kneepkens, Edwin Heijman, Jochen Keupp, Steffen Weiss, Klaas Nicolay, Holger Grüll
OBJECTIVES: Magnetic resonance-guided high-intensity focused ultrasound (MR-HIFU) is a method to heat lesions noninvasively to a stable, elevated temperature and a well-suited method to induce local hyperthermia (41°C-43°C) in deep-seated tissues. Magnetic Resonance (MR) imaging provides therapy planning on anatomical images and offers temperature feedback based on near-real-time MR thermometry. Although constant acquisition of MR thermometry data is crucial to ensure prolonged hyperthermia, it limits the freedom to perform measurements of other MR parameters, which are of interest during hyperthermia treatments...
June 8, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28594113/self-gated-4d-mri-of-the-liver-initial-clinical-results-of-continuous-multiphase-imaging-of-hepatic-enhancement
#19
Jakob Weiss, Mike Notohamiprodjo, Petros Martirosian, Jana Taron, Marcel D Nickel, Manuel Kolb, Fabian Bamberg, Konstantin Nikolaou, Ahmed E Othman
PURPOSE: To evaluate the feasibility of a self-gated free-breathing volume-interpolated breath-hold examination (VIBE) sequence using compressed sensing (CS) for contrast-enhanced multiphase liver MRI. MATERIALS AND METHODS: We identified 23 patients who underwent multiphase gadobutrol-enhanced liver magnetic resonance imaging (MRI) using 1) a prototype free-breathing VIBE sequence with respiratory self-gating and CS (VIBECS ), and 2) a standard breath-hold VIBE (VIBESTD ) on the same 1...
June 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28592962/how-to-detect-atrial-fibrosis
#20
REVIEW
Juan Lacalzada-Almeida, Javier García-Niebla
In the last twenty years, new imaging techniques to assess atrial function and to predict the risk of recurrence of atrial fibrillation after treatment have been developed. The present review deals with the role of these techniques in the detection of structural and functional changes of the atrium and diagnosis of atrial remodeling, particularly atrial fibrosis. Echocardiography allows the detection of anatomical, functional changes and deformation of the atrial wall during the phases of the cardiac cycle...
March 2017: Journal of Geriatric Cardiology: JGC
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