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https://www.readbyqxmd.com/read/28445914/clinical-significance-of-intraluminal-contrast-enhancement-in-patients-with-spontaneous-cervical-artery-dissection-a%C3%A2-black-blood-mri-study
#1
Eva Coppenrath, Olga Lenz, Nora Sommer, Nina Lummel, Jennifer Linn, Karla Treitl, Fabian Bamberg, Maximilian Reiser, Thomas Pfefferkorn, Tobias Saam
Purpose Recent studies have suggested that intraluminal thrombi show contrast enhancement on carotid black-blood T1w MRI. The aim of this study was to evaluate the significance of intraluminal contrast enhancement (iCE) regarding symptom status in patients with spontaneous cervical artery dissection (sCAD). Methods 33 consecutive patients (19 men) with sCAD received a brain MRI (DIFF, T2w, T2*w, FLAIR) and a multi-sequence 3T-MRI with fat-saturated high-resolution black-blood T1w-sequences pre- and post-contrast, contrast-enhanced MR angiography and TOF images of carotid and vertebral arteries...
April 26, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28438710/a-purpose-built-neck-coil-for-black-blood-dante-prepared-carotid-artery-imaging-at-7t
#2
Konstantinos Papoutsis, Linqing Li, Jamie Near, Stephen Payne, Peter Jezzard
Atherosclerotic plaques in the bifurcation of the carotid arteries can pose a significant health risk due to possible plaque rupture and subsequent stroke. The assessment of plaques, and evaluation of the risk they pose, can be performed with Black-Blood (BB) vessel wall magnetic resonance imaging. However, resolution at standard clinical field strengths (up to 3T) is limited, hampering reliable assessment and diagnosis. The aim of this study was to investigate the benefits of 7T MRI using a BB application that has been successful at clinical field strengths...
April 22, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28422654/novel-mri-technique-enables-non-invasive-measurement-of-atrial-wall-thickness
#3
Marta Varela, Ross Morgan, Adeline Theron, Desmond Dillon-Murphy, Henry Chubb, John Whitaker, Markus Henningsson, Paul Aljabar, Tobias Schaeffter, Christoph Kolbitsch, Oleg V Aslanidi
Knowledge of atrial wall thickness (AWT) has the potential to provide important information for patient stratification and the planning of interventions in atrial arrhythmias. To date, information about AWT has only been acquired in post-mortem or poor-contrast CT studies, providing limited coverage and highly variable estimates of AWT. We present a novel contrast agent-free MRI sequence for imaging AWT and use it to create personalized AWT maps and a biatrial atlas. A novel black-blood phase-sensitive inversion recovery protocol was used to image 10 volunteers and 2 atrial fibrillation patients, as proof of concept...
April 13, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28395123/focused-ultrasound-as-a-novel-strategy-for-alzheimer-disease-therapeutics
#4
Ying Meng, Matthew Volpini, Sandra Black, Andres M Lozano, Kullervo Hynynen, Nir Lipsman
No abstract text is available yet for this article.
April 10, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28350034/spectrophotometric-analysis-at-the-single-cell-level-elucidating-dispersity-within-melanic-immortalized-cell-populations
#5
Luis Polo-Parada, Gerardo Gutiérrez-Juárez, David Cywiak, Rafael Pérez-Solano, Gary A Baker
It is widely held that the melanosome is an exemplar of the absorption features of melanin-containing cells, which are assumed to be uniform in both size and optical characteristics. In recent years, however, it has become increasingly apparent that this is a strikingly poor assumption. Indeed, melanin extracted from natural sources and synthetic melanin both show wide variability in their degree of polymerization (molecular weight) and spectroscopic characteristics. In the current study, imaging spectrophotometry performed on individual cells of immortalized melanin-producing cell lines revealed broad distributions in their sizes: 9...
May 2, 2017: Analyst
https://www.readbyqxmd.com/read/28327475/free-breathing-black-blood-cine-fast-spin-echo-imaging-for-measuring-abdominal-aortic-wall-distensibility-a-feasibility-study
#6
Jyh-Miin Lin, Andrew J Patterson, Tzu-Cheng Chao, Chengcheng Zhu, Hing-Chiu Chang, Jason Mendes, Hsiao-Wen Chung, Jonathan H Gillard, Martin J Graves
The paper reports a free-breathing black-blood CINE fast-spin echo (FSE) technique for measuring abdominal aortic wall motion. The free-breathing CINE FSE includes the following MR techniques: (1) variable-density sampling with fast iterative reconstruction; (2) inner-volume imaging; and (3) a blood-suppression preparation pulse. The proposed technique was evaluated in eight healthy subjects. The inner-volume imaging significantly reduced the intraluminal artifacts of respiratory motion (p  =  0.015)...
May 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28327196/primary-hepatic-angiomyolipoma-immunohistochemistry-and-electron-microscopic-observations-a-case-report
#7
Hidefumi Kubo, Hitoshi Yamazaki, Takemichi Okada, Yoshihito Takahashi, Yatsushi Nishi, Hiroaki Yokomori
BACKGROUND: Hepatic angiomyolipomas are a rare, benign group of mesenchymal tumors in the liver. Hepatic angiomyolipoma is sometimes misdiagnosed as hepatocellular carcinoma, and there is the possibility of a malignant transformation. Hence, the accurate diagnosis of this disorder is necessary. CASE PRESENTATION: A 64-year-old Japanese man was observed to have a space-occupying lesion of 15-mm diameter in the liver during a follow-up examination for a previously resected cecal carcinoma...
March 22, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28314627/n-%C3%AE%C2%B5-carboxymethyl-lysine-concentration-in-debris-from-carotid-artery-stenting-correlates-independently-with-signal-intensity-on-t1-weighted-black-blood-magnetic-resonance-images
#8
Ayumu Eto, Noriyuki Sakata, Ryoji Nagai, Jun-Ichi Shirakawa, Ritsurou Inoue, Fumiaki Kiyomi, Kouhei Nii, Hiroshi Aikawa, Minoru Iko, Masanori Tsutsumi, Kimiya Sakamoto, Fumihiro Hiraoka, Takahumi Mitsutake, Hayatsura Hanada, Kiyoshi Kazekawa
BACKGROUND AND PURPOSE: Because magnetic resonance imaging (MRI) focuses on the morphological characteristics of carotid artery plaques, its diagnostic value with respect to plaque vulnerability is limited. We examined the correlation between N(ε)-(carboxymethyl)lysine (CML), a main chemical structure of advanced glycation end-products, and the vulnerability of plaques visualized on MRI scans. MATERIALS AND METHODS: We enrolled 43 patients who had undergone carotid artery stenting (CAS) for carotid artery stenosis; all underwent MRI studies, including black-blood MRI and diffusion-weighted imaging (DWI)...
March 14, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28288506/hepatic-perivascular-epithelioid-cell-tumor-pecoma-a-case-report-with-a-review-of-literatures
#9
REVIEW
Hyun-Jin Son, Dong Wook Kang, Joo Heon Kim, Hyun Young Han, Min Koo Lee
Hepatic perivascular epithelioid cell tumors (PEComas) are very rare. We report a primary hepatic PEComa with a review of the literature. A 56-year-old women presented with a nodular mass detected during the management of chronic renal failure and chronic hepatitis C. Diagnostic imaging studies suggested a nodular hepatocellular carcinoma in segment 5 of the liver. The patient underwent partial hepatectomy. A brown-colored expansile mass measuring 3.2×3.0 cm was relatively demarcated from the surrounding liver parenchyma...
March 2017: Clinical and Molecular Hepatology
https://www.readbyqxmd.com/read/28270208/aortic-length-measurements-for-pulse-wave-velocity-calculation-manual-2d-vs-automated-3d-centreline-extraction
#10
Arna van Engelen, Miguel Silva Vieira, Isma Rafiq, Marina Cecelja, Torben Schneider, Hubrecht de Bliek, C Alberto Figueroa, Tarique Hussain, Rene M Botnar, Jordi Alastruey
BACKGROUND: Pulse wave velocity (PWV) is a biomarker for the intrinsic stiffness of the aortic wall, and has been shown to be predictive for cardiovascular events. It can be assessed using cardiovascular magnetic resonance (CMR) from the delay between phase-contrast flow waveforms at two or more locations in the aorta, and the distance on CMR images between those locations. This study aimed to investigate the impact of different distance measurement methods on PWV. We present and evaluate an algorithm for automated centreline tracking in 3D images, and compare PWV calculations using distances derived from 3D images to those obtained from a conventional 2D oblique-sagittal image of the aorta...
March 8, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28269720/preliminary-study-on-the-automated-skull-fracture-detection-in-ct-images-using-black-hat-transform
#11
Ayumi Yamada, Atsushi Teramoto, Tomoko Otsuka, Kohei Kudo, Hirofumi Anno, Hiroshi Fujita
Linear skull fracture, following head trauma, may reach major blood vessels, such as the middle meningeal artery or sinus venosus, and may cause epidural hematoma. However, hematoma is likely to be missed in the initial interpretation because it spreads only gradually. In addition, the fracture lines that run along the scan slice plane are often missed during initial interpretation. In this study, we develop a novel method for automated detection of the linear skull fracture using head computed tomography (CT) images and conduct a basic evaluation using digital phantom and head phantom that enclose genuine human bones...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28265294/the-bare-head-of-the-northern-bald-ibis-geronticus-eremita-fulfills-a-thermoregulatory-function
#12
REVIEW
Ismael Galván, Daniel Palacios, Juan José Negro
BACKGROUND: Dark pigments provide animals with several adaptive benefits such as protection against ultraviolet (UV) radiation and mechanical abrasion, but may also impose several constraints like a high absorbance of solar radiation. Endotherms, with relatively constant and high body temperatures, may be especially prone to thermoregulatory limitations if dark coloured and inhabiting hot environments. It is therefore expected that adaptations have specifically evolved because of these limitations...
2017: Frontiers in Zoology
https://www.readbyqxmd.com/read/28246519/assessment-of-arterial-wall-enhancement-for-differentiation-of-parent-artery-disease-from-small-artery-disease-comparison-between-histogram-analysis-and-visual-analysis-on-3-dimensional-contrast-enhanced-t1-weighted-turbo-spin-echo-mr-images-at-3t
#13
Jinhee Jang, Tae-Won Kim, Eo-Jin Hwang, Hyun Seok Choi, Jaseong Koo, Yong Sam Shin, So-Lyung Jung, Kook-Jin Ahn, Bum-Soo Kim
OBJECTIVE: The purpose of this study was to compare the histogram analysis and visual scores in 3T MRI assessment of middle cerebral arterial wall enhancement in patients with acute stroke, for the differentiation of parent artery disease (PAD) from small artery disease (SAD). MATERIALS AND METHODS: Among the 82 consecutive patients in a tertiary hospital for one year, 25 patients with acute infarcts in middle cerebral artery (MCA) territory were included in this study including 15 patients with PAD and 10 patients with SAD...
March 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/28236046/prevalence-and-distribution-of-calcified-nodules-in-carotid-arteries-in-correlation-with-clinical-symptoms
#14
Karolin Johanna Paprottka, Damiana Saam, Johannes Rübenthaler, Andreas Schindler, Nora Navina Sommer, Philipp Marius Paprottka, Dirk André Clevert, Maximilian Reiser, Tobias Saam, Andreas Helck
PURPOSE: Calcified nodules ("CN") are responsible for up to 5% of coronary-infarcts and, therefore, classified as minor criteria of "vulnerable" atherosclerotic plaque. We sought to evaluate prevalence and distribution of CN in carotid arteries in correlation with clinical symptoms. METHODS: 178 consecutive patients with unilateral ischemic stroke and carotid plaques ≥2 mm by duplex ultrasound underwent a carotid-black-blood-3T-MRI with fat-saturated pre- and post-contrast T1w-, PDw-, T2w- and TOF images using dedicated surface-coils...
June 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28227984/preliminary-study-on-the-automated-skull-fracture-detection-in-ct-images-using-black-hat-transform
#15
Ayumi Yamada, Atsushi Teramoto, Tomoko Otsuka, Kohei Kudo, Hirofumi Anno, Hiroshi Fujita, Ayumi Yamada, Atsushi Teramoto, Tomoko Otsuka, Kohei Kudo, Hirofumi Anno, Hiroshi Fujita, Tomoko Otsuka, Hiroshi Fujita, Ayumi Yamada, Kohei Kudo, Hirofumi Anno, Atsushi Teramoto
Linear skull fracture, following head trauma, may reach major blood vessels, such as the middle meningeal artery or sinus venosus, and may cause epidural hematoma. However, hematoma is likely to be missed in the initial interpretation because it spreads only gradually. In addition, the fracture lines that run along the scan slice plane are often missed during initial interpretation. In this study, we develop a novel method for automated detection of the linear skull fracture using head computed tomography (CT) images and conduct a basic evaluation using digital phantom and head phantom that enclose genuine human bones...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28216362/endovascular-aneurysm-repair-patients-who-are-lost-to-follow-up-have-worse-outcomes
#16
Caitlin W Hicks, Devin S Zarkowsky, Ian C Bostock, David H Stone, James H Black, Jens Eldrup-Jorgensen, Philip P Goodney, Mahmoud B Malas
BACKGROUND: Society for Vascular Surgery practice guidelines recommend 1- and 12-month follow-up with computed tomography imaging for the year after endovascular aneurysm repair (EVAR). We describe the incidence, risk factors, and outcomes of EVAR patients who are lost to follow-up (LTF). METHODS: All patients undergoing elective EVAR in the Vascular Quality Initiative (VQI) data set (January 2003-December 2015) were stratified according to long-term follow-up method (in-person vs phone call vs LTF)...
June 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28202707/cadasil-accelerated-by-acute-hypotension-arterial-and-venous-contribution-to-leukoaraiosis
#17
Jacqueline A Pettersen, Julia Keith, Fuqiang Gao, J David Spence, Sandra E Black
OBJECTIVE: To underline the importance of blood pressure regulation in cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) and to describe changes that occur in the veins in this condition, specifically venous collagenosis associated with leukoaraiosis. METHODS: Case report with neuroimaging and pathologic data. RESULTS: A 61-year-old man with genetically confirmed CADASIL was initially lucid following a motor vehicle accident but subsequently became hypotensive (60/40 mm Hg) due to an open femur fracture and required intubation...
March 14, 2017: Neurology
https://www.readbyqxmd.com/read/28153949/factors-associated-with-left-atrial-remodeling-in-the-general-population
#18
COMPARATIVE STUDY
Walter Oliver, Gwendolyn Matthews, Colby R Ayers, Sonia Garg, Sachin Gupta, Ian J Neeland, Mark H Drazner, Jarett D Berry, Susan Matulevicius, James A de Lemos
BACKGROUND: Although contributors to remodeling of the left ventricle (LV) have been well studied in general population cohorts, few data are available describing factors influencing changes in left atrial (LA) structure. METHODS AND RESULTS: Maximum LA volume was determined by cardiac magnetic resonance imaging among 748 participants in the Dallas Heart Study at 2 visits a mean of 8 years apart. Associations of changes in LA volume (ΔLAV) with traditional risk factors, biomarkers, LV geometry, and remodeling by cardiac magnetic resonance imaging and detailed measurements of global and regional adiposity (by magnetic resonance imaging and dual-energy x ray absorptiometry) were assessed using multivariable linear regression...
February 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28138817/incremental-value-of-cardiac-magnetic-resonance-for-the-evaluation-of-cardiac-tumors-in-adults-experience-of-a-high-volume-tertiary-cardiology-centre
#19
Sorin Giusca, Derliz Mereles, Andreas Ochs, Sebastian Buss, Florian André, Sebastian Seitz, Johannes Riffel, Philipp Fortner, Mindaugas Andrulis, Stefan Schönland, Hugo A Katus, Grigorios Korosoglou
To assess the value of cardiac magnetic resonance imaging (CMR) in evaluating cardiac tumours in a tertiary cardiology centre. Between 2004 and 2014, 125 patients (pts.) from a total of 17000 who received a CMR examination in our institution were referred with the suspicion of cardiac tumours. A dedicated protocol was used that included standard cine SSFP acquisitions as well as tissue characterization using T1 and T2 black-blood (T1 BB and T2 BB respectively) with and without fat suppression, perfusion of the structure and late gadolinium enhancement...
January 30, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28123058/procalcitonin-and-midregional-proatrial-natriuretic-peptide-as-biomarkers-of-subclinical-cerebrovascular-damage-the-northern-manhattan-study
#20
Mira Katan, Yeseon Moon, Arnold von Eckardstein, Kathartina Spanaus, Janet DeRosa, Jose Gutierrez, Charles DeCarli, Clinton Wright, Ralph Sacco, Mitchell Elkind
BACKGROUND AND PURPOSE: Chronic infections and cardiac dysfunction are risk factors for stroke. We hypothesized that blood biomarkers of infection (procalcitonin) and cardiac dysfunction (midregional proatrial natriuretic peptide [MR-proANP]), previously associated with small vessel stroke and cardioembolic stroke are also associated with subclinical cerebrovascular damage, including silent brain infarcts and white matter hyperintensity volume. METHODS: The NOMAS (Northern Manhattan Study) was designed to assess risk factors for incident vascular disease in a multiethnic cohort...
March 2017: Stroke; a Journal of Cerebral Circulation
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