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https://www.readbyqxmd.com/read/27888153/three-dimensional-black-blood-t2-mapping-with-compressed-sensing-and-data-driven-parallel-imaging-in-the-carotid-artery
#1
Jianmin Yuan, Ammara Usman, Scott A Reid, Kevin F King, Andrew J Patterson, Jonathan H Gillard, Martin J Graves
PURPOSE: To develop a 3D black-blood T2 mapping sequence with a combination of compressed sensing (CS) and parallel imaging (PI) for carotid wall imaging. MATERIALS AND METHODS: A 3D black-blood fast-spin-echo (FSE) sequence for T2 mapping with CS and PI was developed and validated. Phantom experiments were performed to assess T2 accuracy using a Eurospin Test Object, with different combination of CS and PI acceleration factors. A 2D multi-echo FSE sequence was used as a reference to evaluate the accuracy...
November 22, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27867171/optimal-imaging-parameters-and-the-advantage-of-renal-artery-image-using-time-spatial-labeling-inversion-pulse-at-3-tesla-magnetic-resonance-imaging-comparison-of-image-quality-for-1-5-tesla-magnetic-resonance-imaging
#2
Keita Fukushima, Isao Miyazaki, Kuninori Kobayashi, Makio Ooto
With the recent spread of three tesla (3 T) magnetic resonance imaging (MRI), time-spatial labeling inversion pulse (Time-SLIP) technique at high magnetic field can be used. The purpose of this study was to determine appropriate renal artery imaging parameters and to compare with the 1.5 T MRI image quality of a renal artery using the Time-SLIP technique. The imaging sequence was 3D true steady-state free precession (True SSFP), and using respiratory gated by the voice instructions of breath interval 2, 4, 6 seconds...
2016: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/27866381/cardiac-magnetic-resonance-imaging-of-patent-ductus-arteriosus-in-three-dogs
#3
Youngjae Lee, Jaihyun Jung, Junyong Park, Jiyoon Jeong, Seokho Jeon, Sunyoung Park, Jinhwa Chang, Ji-Houn Kang, Chulhyun Lee, Dongwoo Chang
Patent ductus arteriosus (PDA) is the most common congenital cardiovascular disorder in dogs and requires an accurate diagnosis for an appropriate treatment. Cardiac MRI (cMRI) has been reported as a method for characterization of canine thoracic vasculature. However, to the authors' knowledge, no published studies describe evaluation of canine PDA through cMRI. Three dogs were selected for this exploratory study. Electrocardiogram gating and breath-hold techniques were performed using a 3T MR scanner. Both black blood imaging and bright blood cine acquisitions were performed...
November 20, 2016: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/27856437/quantifying-intracranial-plaque-permeability-with-dynamic-contrast-enhanced-mri-a-pilot-study
#4
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...
November 17, 2016: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/27826082/spectrally-presaturated-modulation-spm-an-efficient-fat-suppression-technique-for-steam-based-cardiac-imaging-sequences
#5
Ahmed S Fahmy, El-Sayed H Ibrahim, Nael F Osman
Stimulated-echo acquisition mode (STEAM) is a key pulse sequences in MRI in general, and in cardiac imaging in particular. Fat suppression is an important feature in cardiac imaging to improve visualization and eliminate off-resonance and chemical-shift artifacts. Nevertheless, fat suppression comes at the expense of reduced temporal resolution and signal-to-noise ratio (SNR). The purpose of this study is to develop an efficient fat suppression method (Spectrally-Presaturated Modulation) for STEAM-based sequences to enable imaging with high temporal-resolution, high SNR, and no increase in scan time...
November 4, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27775841/evaluation-of-an-fmri-uspio-based-assay-in-healthy-human-volunteers
#6
Richard Baumgartner, William Cho, Alexandre Coimbra, Christopher Chen, Zaiqi Wang, Arie Struyk, Narayanaswamy Venketasubramanian, May Low, Cindy Gargano, Fuqiang Zhao, Donald Williams, Torsten Reese, Stephanie Seah, Dai Feng, Sonya Apreleva, Esben Petersen, Jeffrey L Evelhoch
PURPOSE: To present the testretest and contrast dose effect results of cerebral blood volume (CBV) functional MRI (fMRI) in healthy human volunteers using ferumoxytol (Feraheme), an ultrasmall-superparamagnetic iron oxide (USPIO) nanoparticle. MATERIALS AND METHODS: This was an open-label, two-period, fixed-sequence study in healthy young volunteers. In eight subjects, using a 3 Tesla field strength system, blood oxygen level dependent (BOLD) and CBV fMRI were acquired in response to a visual black-and-white checkboard stimulation paradigm using an escalating ferumoxytol dose design (250, 350, and 510 mg iron)...
October 24, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27765555/magnetic-resonance-imaging-based-assessment-of-carotid-atheroma-a-comparative-study-of-patients-with-and-without-coronary-artery-disease
#7
Ammara Usman, Umar Sadat, Zhongzhao Teng, Martin J Graves, Jonathan R Boyle, Kevin Varty, Paul D Hayes, Jonathan H Gillard
BACKGROUND: Functional magnetic resonance (MR) imaging of atheroma using contrast media enables assessment of the systemic severity of atherosclerosis in different arterial beds. Whether black-blood imaging has similar ability remains widely unexplored. In this study, we evaluate whether black-blood imaging can differentiate carotid plaques of patients with and without coronary artery disease (CAD) in terms of morphological and biomechanical features of plaque vulnerability, thereby allowing assessment of the systemic severity nature of atherosclerosis in different arterial beds...
October 17, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/27761546/a-significant-enhancement-of-color-transition-from-an-on-off-type-achromatic-colorimetric-nanosensor-for-highly-sensitive-multi-analyte-detection-with-the-naked-eye
#8
Jun Hyuk Heo, Gyu Sung Yi, Byoung Sang Lee, Hui Hun Cho, Jin Woong Lee, Jung Heon Lee
Here, we report the development of an achromatic nanoparticle-based colorimetric sensor (achromatic nanosensor) with an on-off type color change that significantly enhances the color transition and increases the sensitivity of the sensor for naked-eye inspection. The achromatic nanosensor was prepared via a modified CMYK (CRYK) subtractive color model by combining DNA-functionalized gold nanoparticles (AuNPs-DNA), silver nanoparticles (AgNPs-DNA), and gold nanorods (AuNRs-DNA). The initially black-colored achromatic nanosensor not only allowed multiplexed detection by generating target-specific diverse color changes, but also improved the recognition of color changes by the naked eye...
October 20, 2016: Nanoscale
https://www.readbyqxmd.com/read/27754031/yia-03-07-reactive-oxygen-species-adversely-relates-to-early-vascular-changes-and-arterial-stiffness-in-black-normotensive-smokers-the-african-predict-study
#9
Ruan Kruger, Moliehi Mothae, Wayne Smith
OBJECTIVE: Cigarette smoking weakens the antioxidant defence system and is considered a lifestyle risk factor contributing to cardiovascular disease progression. Little information exists on these links in non-smoking versus smoking populations. We aimed to explore the associations of oxidative stress with markers of vascular function in a young, normotensive bi-ethnic population. DESIGN AND METHOD: We included 237 non-smokers (108 black and 129 white) and 145 smokers (78 black and 67 white) from South Africa between ages 20 and 30 years...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27754024/yia-02-04-relationship-between-leptin-and-incident-hypertension-observations-from-the-dallas-heart-study
#10
Poghni Peri-Okonny, Colby Ayers, Naim Maalouf, Sandeep Das, James De Lemos, Jarett Berry, Aslan Turer, Ian Neeland, Philipp Scherer, Wanpen Vongpatanasin
OBJECTIVE: To examine the effect of body adiposity on relationship between leptin and incident hypertension in a multiethnic sample of US population. DESIGN AND METHOD: Participants were normotensive adults with BP ≤ 130/85 enrolled in Dallas Heart Study, a large, multiethnic population-based cohort. Incident hypertension was defined as systolic BP ≥ 140 mmHg, diastolic BP ≥ 90 mmHg, or initiation of antihypertensive medications.Biomarkers were measured at baseline from fasting venous blood samples...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27709071/black-blood-t1rho-mr-imaging-may-diagnose-early-stage-liver-fibrosis-a-proof-of-principle-study-with-rat-biliary-duct-ligation-model
#11
Chi-Man Koon, Xin Zhang, Weitian Chen, Eagle Siu Hong Chu, Clara Bik San Lau, Yì-Xiáng J Wáng
BACKGROUND: To explore black blood T1rho (T1ρ) liver imaging and investigate the earliest stage when biliary duct ligation (BDL) induced liver fibrosis can be diagnosed. METHODS: MR was performed at 3 Tesla. A T1ρ prepared 2D fast spin echo (FSE) sequence with acquisition of four spin lock times (TSLs: 1, 10, 30, and 50 msec) and spin-lock frequency of 500 Hz was applied. Inherent black blood effect of FSE and double inversion recovery (DIR) achieved blood signal suppression, and 3 axial sections per liver were obtained...
August 2016: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/27691965/anesthesia-in-a-captive-juvenile-black-rhinoceros-diceros-bicornis-for-magnetic-resonance-imaging-and-computed-tomography
#12
Cameron Ratliff, Rebecca S Sayre, Mauricio Lepiz
A hand-reared, 53-kg, female, 30-day-old black rhinoceros ( Diceros bicornis ) calf presented for magnetic resonance imaging and computed tomography after demonstrating neurologic signs. The rhino was premedicated intramuscularly with butorphanol and midazolam, yielding satisfactory sedation. Induction was achieved using intravenous propofol until the trachea could be intubated. Anesthesia was maintained with sevoflurane in 100% oxygen (mean end-tidal concentration of 2 ± 0.5%). Mean values recorded during anesthesia included were heart rate, end-tidal carbon dioxide, respiratory rate, noninvasive blood pressure, and pulse oximetry...
September 2016: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/27642949/yia-03-07-reactive-oxygen-species-adversely-relates-to-early-vascular-changes-and-arterial-stiffness-in-black-normotensive-smokers-the-african-predict-study
#13
Ruan Kruger, Moliehi Mothae, Wayne Smith
OBJECTIVE: Cigarette smoking weakens the antioxidant defence system and is considered a lifestyle risk factor contributing to cardiovascular disease progression. Little information exists on these links in non-smoking versus smoking populations. We aimed to explore the associations of oxidative stress with markers of vascular function in a young, normotensive bi-ethnic population. DESIGN AND METHOD: We included 237 non-smokers (108 black and 129 white) and 145 smokers (78 black and 67 white) from South Africa between ages 20 and 30 years...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27642942/yia-02-04-relationship-between-leptin-and-incident-hypertension-observations-from-the-dallas-heart-study
#14
Poghni Peri-Okonny, Colby Ayers, Naim Maalouf, Sandeep Das, James De Lemos, Jarett Berry, Aslan Turer, Ian Neeland, Philipp Scherer, Wanpen Vongpatanasin
OBJECTIVE: To examine the effect of body adiposity on relationship between leptin and incident hypertension in a multiethnic sample of US population. DESIGN AND METHOD: Participants were normotensive adults with BP ≤ 130/85 enrolled in Dallas Heart Study, a large, multiethnic population-based cohort. Incident hypertension was defined as systolic BP ≥ 140 mmHg, diastolic BP ≥ 90 mmHg, or initiation of antihypertensive medications.Biomarkers were measured at baseline from fasting venous blood samples...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27624687/the-effect-of-an-acute-bout-of-resistance-exercise-on-carotid-artery-strain-and-strain-rate
#15
Jane M Black, Eric J Stöhr, Keeron Stone, Christopher J A Pugh, Mike Stembridge, Rob Shave, Joseph I Esformes
Arterial wall mechanics likely play an integral role in arterial responses to acute physiological stress. Therefore, this study aimed to determine the impact of low and moderate intensity double-leg press exercise on common carotid artery (CCA) wall mechanics using 2D vascular strain imaging. Short-axis CCA ultrasound images were collected in 15 healthy men (age: 21 ± 3 years; stature: 176.5 ± 6.2 cm; body mass; 80.6 ± 15.3 kg) before, during, and immediately after short-duration isometric double-leg press exercise at 30% and 60% of participants' one-repetition maximum (1RM: 317 ± 72 kg)...
September 2016: Physiological Reports
https://www.readbyqxmd.com/read/27567294/relationship-between-the-carotid-plaque-t1-relaxation-time-and-the-plaque-to-muscle-signal-intensity-ratio-on-black-blood-magnetic-resonance-imaging-scans
#16
Ayumu Eto, Yoshimasa Kinoshita, Yoshihisa Matsumoto, Fumiaki Kiyomi, Minoru Iko, Kouhei Nii, Masanori Tsutsumi, Kimiya Sakamoto, Hiroshi Aikawa, Kiyoshi Kazekawa
BACKGROUND: Black-blood magnetic resonance imaging (BB-MRI) is useful for the characterization and assessment of carotid artery plaques. The plaque-to-muscle signal intensity (SI) ratio (plaque/muscle ratio [PMR]) is used widely to evaluate plaques. However, the correlation between the PMR and the T1 relaxation time needs to be determined. We measured the T1 relaxation time of carotid plaques using T1 mapping and compared the results with the PMR on BB-MRI scans. METHODS: Between April 2014 and July 2015, 20 patients with carotid artery stenosis were treated by carotid artery stenting...
August 23, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/27521762/an-exploration-of-the-potential-utility-of-fetal-cardiovascular-mri-as-an-adjunct-to-fetal-echocardiography
#17
David F A Lloyd, Joshua F P van Amerom, Kuberan Pushparajah, John M Simpson, Vita Zidere, Owen Miller, Gurleen Sharland, Joanna Allsop, Matthew Fox, Maelene Lohezic, Maria Murgasova, Christina Malamateniou, Jo V Hajnal, Mary Rutherford, Reza Razavi
OBJECTIVES: Fetal cardiovascular magnetic resonance imaging (MRI) offers a potential alternative to echocardiography, although in practice, its use has been limited. We sought to explore the need for additional imaging in a tertiary fetal cardiology unit and the usefulness of standard MRI sequences. METHODS: Cases where the diagnosis was not fully resolved using echocardiography were referred for MRI. Following a three-plane localiser, fetal movement was assessed with a balanced steady-state free precession (bSSFP) cine...
October 2016: Prenatal Diagnosis
https://www.readbyqxmd.com/read/27516097/spontaneous-dissections-of-the-anterior-cerebral-artery-a-meta-analysis-of-the-literature-and-three-recent-cases
#18
Johannes Hensler, Ulf Jensen-Kondering, Stephan Ulmer, Olav Jansen
INTRODUCTION: Spontaneous dissections of intracranial arteries are rare, but important causes of stroke, especially in younger patients. Dissections of the anterior cerebral artery (ACA) have been reported only very rarely in the European and North American populations but might be more prevalent than previously thought. METHODS: This paper describes the presenting pattern of the disease, the clinical and imaging findings, as well as endovascular therapeutical options with respect to a meta-analysis of cases reported in the literature...
August 11, 2016: Neuroradiology
https://www.readbyqxmd.com/read/27510630/3d-black-blood-3t-mri-for-the-diagnosis-of-thoracic-large-vessel-vasculitis-a-feasibility-study
#19
Karla Maria Treitl, Stefan Maurus, Nora Narvina Sommer, Hendrik Kooijman-Kurfuerst, Eva Coppenrath, Marcus Treitl, Michael Czihal, Ulrich Hoffmann, Claudia Dechant, Hendrik Schulze-Koops, Tobias Saam
OBJECTIVES: To evaluate the feasibility of T1w-3D black-blood turbo spin echo (TSE) sequence with variable flip angles for the diagnosis of thoracic large vessel vasculitis (LVV). METHODS: Thirty-five patients with LVV, diagnosed according to the current standard of reference, and 35 controls were imaged at 3.0T using 1.2 × 1.3 × 2.0 mm(3) fat-suppressed, T1w-3D, modified Volumetric Isotropic TSE Acquisition (mVISTA) pre- and post-contrast. Applying a navigator and peripheral pulse unit triggering (PPU), the total scan time was 10-12 min...
August 10, 2016: European Radiology
https://www.readbyqxmd.com/read/27508739/-op-5b-05-characterisation-of-longitudinal-changes-in-vascular-structure-and-function-over-a-4-year-follow-up-period-as-assessed-by-mri
#20
M Cecelja, T Hussain, M Silva Vieira, A Phinikaridou, G Greil, T Spector, P Chowienczyk
OBJECTIVE: Vascular aging is characterised by structural changes: wall thickening and change in lumen diameter, together with functional changes in aortic stiffness. We investigated the longitudinal structural and functional changes that occur in the aortic wall over a 4 year follow-up period. DESIGN AND METHOD: Magnetic resonance imaging (MRI) was performed in 38 asymptomatic women aged between 53-73 years at baseline and 4 years later over from the aortic arch to aortic bifurcation...
September 2016: Journal of Hypertension
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