keyword
MENU ▼
Read by QxMD icon Read
search

MRA

keyword
https://www.readbyqxmd.com/read/29232026/noncontrast-enhanced-time-resolved-4d-dynamic-intracranial-mr-angiography-at-7t-a-feasibility-study
#1
Fei Cong, Yan Zhuo, Songlin Yu, Xianchang Zhang, Xinyuan Miao, Jing An, Shuo Wang, Yong Cao, Yan Zhang, Hee Kwon Song, Danny Jj Wang, Lirong Yan
BACKGROUND: Arterial spin labeling (ASL) based-noncontrast-enhanced 4D MR angiography (NCE 4D MRA) shows potential in characterizing cerebrovascular hemodynamics in cerebrovascular disorders. Ultrahigh-field theoretically benefits ASL signal with increased inherent signal-to-noise ratio (SNR) and prolonged blood T1 , which may provide improved delineation of vasculature in 4D MRA. PURPOSE: To investigate the feasibility of NCE 4D MRA using 3D Cartesian trajectory and stack-of-stars (SOS) golden angle radial trajectory at 7T...
December 12, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29231948/a-tailored-nanosheet-decorated-with-a-metallized-dendrimer-for-angiography-and-magnetic-resonance-imaging-guided-combined-chemotherapy
#2
Guilong Zhang, Ruohong Du, Junchao Qian, Xiaojia Zheng, Xiaohe Tian, Dongqing Cai, Jiacai He, Yiqun Wu, Wei Huang, Yuanyin Wang, Xin Zhang, Kai Zhong, Duohong Zou, Zhengyan Wu
Considering the chemical exchange between gadolinium centers and water protons, nanosystems comprising gadolinium conjugated with high specific area nanocarriers might serve as more robust clinical tools for diagnosis and imaging-guided therapy. Herein, a pH-responsive nanosystem containing graphene oxide conjugated with a folic acid- and gadolinium-labeled dendrimer (FA-GCGLD) to boost its T1 contrast ability was developed, and doxorubicin (DOX) and colchicine (COLC) were efficiently loaded onto this nanosystem (FA-GCGLD-DOX/COLC)...
December 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/29224647/mineralocorticoid-receptor-antagonists-in-patients-with-acute-myocardial-infarction-a-systematic-review-and-meta-analysis-of-randomized-trials
#3
Matthias Bossard, Yasser Binbraik, Farzin Beygui, Bertram Pitt, Faiez Zannad, Gilles Montalescot, Sanjit S Jolly
BACKGROUND: Although mineralocorticoid antagonists (MRAs) reduce mortality in patients with heart failure complicating myocardial infarction (MI), it is unclear if they could be beneficial to all patients with MI. To evaluate the utility of MRAs in MI patients, we performed a systematic review and meta-analysis. METHODS: MEDLINE, EMBASE, and Cochrane CENTRAL were searched from 1965 to June 2016. Conference abstracts were searched from 2000 to June 2016. Randomized trials evaluating the effect of MRA after MIs were included...
January 2018: American Heart Journal
https://www.readbyqxmd.com/read/29218620/the-impact-of-injector-based-contrast-agent-administration-in-time-resolved-mra
#4
Johannes Budjan, Ulrike I Attenberger, Stefan O Schoenberg, Hubertus Pietsch, Gregor Jost
OBJECTIVES: Time-resolved contrast-enhanced MR angiography (4D-MRA), which allows the simultaneous visualization of the vasculature and blood-flow dynamics, is widely used in clinical routine. In this study, the impact of two different contrast agent injection methods on 4D-MRA was examined in a controlled, standardized setting in an animal model. METHODS: Six anesthetized Goettingen minipigs underwent two identical 4D-MRA examinations at 1.5 T in a single session...
December 7, 2017: European Radiology
https://www.readbyqxmd.com/read/29215168/decreased-signal-intensity-ratio-on-mra-reflects-misery-perfusion-on-spect-in-patients-with-intracranial-stenosis
#5
Masatomo Miura, Makoto Nakajima, Akiko Fujimoto, Shinya Shiraishi, David S Liebeskind, Yukio Ando
BACKGROUND AND PURPOSE: Acetazolamide reactivity on 123 I-IMP SPECT is used to detect misery perfusion due to intracranial atherosclerosis. Noninvasive fractional flow assessed by signal intensity ratio (SIR) on time of flight-magnetic resonance angiography (TOF-MRA) might offer a feasible alternative to identify high-risk intracranial stenosis. METHODS: Data from consecutive patients with unilateral middle cerebral artery (MCA) stenosis who underwent both TOF-MRA and acetazolamide reactivity on 123 I-IMP SPECT were retrospectively analyzed...
December 7, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29214780/mismatch-between-tof-mr-angiography-and-ct-angiography-of-the-middle-cerebral-artery-may-be-a-critical-sign-in-cerebrovascular-dynamics
#6
Keiji Igase, Michiya Igase, Ichiro Matsubara, Kazuhiko Sadamoto
PURPOSE: Although time-of-flight (TOF)-magnetic resonance angiography (MRA) can clearly depict intracranial arteries, the arterial flow of middle cerebral artery (MCA) is occasionally not detected. We evaluated this phenomenon with reference to cerebrovascular dynamics. MATERIALS AND METHODS: Seventeen patients with suspected occlusion of MCA or internal carotid artery on TOF-MRA were enrolled. All patients underwent CT angiography (CTA) and quantitative cerebral blood flow (CBF) examination for measurement of resting CBF and cerebrovascular reactivity (CVR)...
January 2018: Yonsei Medical Journal
https://www.readbyqxmd.com/read/29205670/neck-vessel-cross-sectional-area-measured-with-mri-scan-rescan-reproducibility-for-longitudinal-evaluations
#7
Laura Pelizzari, Maria Marcella Laganà, Dejan Jakimovski, Niels Bergsland, Jesper Hagemeier, Giuseppe Baselli, Robert Zivadinov
BACKGROUND AND PURPOSE: The cross-sectional area (CSA) of common carotid arteries-internal carotid arteries (CCA-ICAs), vertebral arteries (VAs), and internal jugular veins (IJVs) is influenced by aging. However, the neck vessel CSA can be affected by other factors as well, including subject positioning, hydration, and respiration, especially in longitudinal studies. This study aimed to assess scan-rescan reproducibility of CCA-ICAs, VAs, and IJVs CSA measurements in order to evaluate their feasibility for longitudinal CSA assessments, and to apply the segmentation method on a longitudinal pilot dataset...
December 4, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29201775/chronic-viral-hepatitis-in-malaysia-where-are-we-now
#8
REVIEW
Ruksana Raihan, Rosmawati Mohamed, Muhammad Radzi Abu Hassan, Rosaida Md Said
Malaysia is a country where an estimated 1 million people are chronically infected with hepatitis B virus (HBV) and an estimated 2.5% of the adult population are positive for antibody to hepatitis C virus (HCV). Effective nationwide vaccine coverage seems to be a highly effective measure to prevent new HBV infection. Treatment of HCV infection is also a regular practice in Malaysia. These measures highlight the possibility to reach the World Health Organization elimination target by 2030. To achieve this target, the Health Ministry and other nongovernmental organizations, such as My Commitment to Cure (MyC2C) are working together to develop a strategic road map to reach the global elimination target in Malaysia by 2030...
January 2017: Euroasian Journal of Hepato-Gastroenterology
https://www.readbyqxmd.com/read/29201581/contrast-enhancement-of-aneurysm-sac-post-pipeline-treatment-interpreted-as-recanalization
#9
Annie J Tsay, Sara Langan, Scott Simon
Multiple imaging modalities are available to evaluate aneurysms post-flow diverter (FD) placement. Though digital subtraction angiography (DSA) is the gold standard imaging modality post-FD placement, it is not perfect, and neither are other techniques, including contrast-enhanced magnetic resonance angiography (CE-MRA) and magnetic resonance imaging (MRI). We present a case of a 73-year-old woman with a right internal carotid artery (ICA) aneurysm treated with a pipeline embolization device (PED). Initial follow-up post-PED placement by three-dimensional time-of-flight (3D-TOF) MRA demonstrated aneurysm occlusion, which was confirmed by computed tomography angiography (CTA) and CE-MRA in subsequent follow-up appointments...
September 29, 2017: Curēus
https://www.readbyqxmd.com/read/29199428/cluster-headache-and-middle-meningeal-artery-dural-arteriovenous-fistulas-a-case-report
#10
Yu-Han Chang, Chao-Bao Luo, Shuu-Jiun Wang, Shih-Pin Chen
Background Of the multiple etiologies identified for symptomatic cluster headache, vascular origin is common; however, there are no known reports of arteriovenous (AV) fistulas. Here we report a case with typical presentation of cluster headache, which might be associated with middle meningeal AV fistulas. Case report The subject is a 49-year-old man with a 7-year history of episodic left-side cluster headache, consistent with the criteria in the International Classification of Headache Disorders, 3rd edition, beta version (ICHD-3β)...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/29197763/carbon-monoxide-packaging-shows-the-same-color-improvement-for-dark-cutting-beef-as-high-oxygen-packaging
#11
Yimin Zhang, Libo Qin, Yanwei Mao, David L Hopkins, Guangxing Han, Lixian Zhu, Xin Luo
In this study, carbon monoxide (CO) modified atmosphere packaging (MAP) was used to increase redness (a*) and lightness (L*) values of dark cutting beef (ultimate pH (pHu)≥6.10), compared to normal pHu beef and intermediate pHu beef (pH: 5.40-5.79; pH: 5.80-6.09, respectively) during 20 d chilled storage. Compared with HiOx-MAP, CO-MAP exhibited similar color improvement effects (increased L*, a*, b* values) for all pHu beef groupings. The metmyoglobin (MetMb) content was lower under CO-MAP than that of HiOx-MAP in normal pHu beef, but opposite effects were observed in dark, high pH beef...
November 17, 2017: Meat Science
https://www.readbyqxmd.com/read/29188304/diagnostic-accuracy-of-cta-and-mri-mra-in-the-evaluation-of-the-cortical-venous-reflux-in-the-intracranial-dural-arteriovenous-fistula-davf
#12
Yen-Heng Lin, Yu-Fen Wang, Hon-Man Liu, Chung-Wei Lee, Ya-Fang Chen, Hong-Jen Hsieh
PURPOSE: Computed tomography angiography (CTA) and magnetic resonance imaging/angiography (MRI/MRA) are used for the diagnosis of intracranial dural arteriovenous fistulas (DAVFs). The purpose of this study was to compare the diagnostic accuracy of CTA and magnetic resonance imaging/angiography (MRI/MRA) for detection of cortical venous reflux (CVR) in intracranial DAVFs. METHODS: The records of patients with angiography-confirmed intracranial DAVFs who also received CTA and MRI/MRA from January 2008 to July 2016 were reviewed...
November 30, 2017: Neuroradiology
https://www.readbyqxmd.com/read/29181219/idiopathic-giant-hepatic-artery-pseudoaneurysm
#13
Ahmed Abdelbaki, Neeraj Bhatt, Nishant Gupta, Shuo Li, Shady Abdelbaki, Yogesh Kumar
Hepatic artery pseudoaneurysm (HAP) incidence is rising due to more common use of endoscopic and percutaneous hepatic interventions. HAP is potentially fatal, as it could lead to sudden life-threatening hemorrhage. HAP can be intrahepatic or extrahepatic. On computed tomography angiogram (CTA) and magnetic resonance angiogram (MRA), HAP follows blood pool on multiphasic examination, with brisk arterial enhancement that washes out, similar to the abdominal aorta on later phases. We present a case of idiopathic giant HAP in an 82-year-old male...
2017: Case Reports in Vascular Medicine
https://www.readbyqxmd.com/read/29178328/mineralocorticoid-receptor-blockade-improves-glucocorticoid-induced-skin-atrophy-but-partially-ameliorates-anti-inflammatory-actions-in-an-irritative-model-in-human-skin-explants
#14
Julia Boix, Van Tuan Nguyen, Nicolette Farman, Sélim Aractingi, Paloma Pérez
We recently demonstrated that blockade of the mineralocorticoid receptor (MR) effectively ameliorated GC-induced skin atrophy in healthy human skin explants and epidermal MR knock-out mice. However, whether MR blockade improves the therapeutic index of GCs in skin pathology was not investigated. We assessed the effects of GCs, MR antagonists (MRA), or both, in SDS-treated human skin explants. All treatments restored SDS-augmented epidermal thickness but only GC plus MRA restored the expression of COL1A1. However, MRA alone or in combination with GCs may exert a dual role in regulating inflammatory cytokines...
November 27, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/29170838/embolization-of-a-traumatic-arteriovenous-fistula-between-the-middle-meningeal-artery-and-middle-meningeal-vein-in-a-child-with-pulsatile-tinnitus
#15
Mesha Martinez, Paola Pergami, Jonathan Murnick, Monica S Pearl
Traumatic arteriovenous fistulas (AVFs) involving the middle meningeal artery (MMA) are uncommon lesions and rare in the pediatric population. An adolescent with headaches developed a bruit and a rhythmic "swooshing" noise in the left ear 9 weeks after a traumatic brain injury involving a left temporal bone fracture. An MRA of the brain demonstrated an enlarged left MMA and arterialized flow in the left middle meningeal vein (MMV), suggestive of an AVF. Cerebral angiography confirmed and characterized the left MMA-MMV fistula, which drained into the pterygoid plexus...
November 23, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29168014/myocardial-perfusion-reserve-quantified-by-cardiac-magnetic-resonance-imaging-is-associated-with-late-gadolinium-enhancement-in-hypertrophic-cardiomyopathy
#16
Daisuke Tezuka, Hisanori Kosuge, Masahiro Terashima, Nozomu Koyama, Tadashi Kishida, Yuko Tada, Jun-Ichi Suzuki, Tetsuo Sasano, Takashi Ashikaga, Kenzo Hirao, Mitsuaki Isobe
Late gadolinium enhancement (LGE) with cardiac magnetic resonance (CMR) imaging has demonstrated the capability of stratifying hypertrophic cardiomyopathy (HCM). Stress perfusion test of CMR can quantify myocardial perfusion reserve (MPR), but its clinical role is not determined. The purpose of this study was to investigate the relationship between MPR and LGE in patients with HCM. A total of 61 consecutive cases underwent complete evaluation with electrocardiography and CMR [cine imaging, coronary MR angiography (MRA), and stress perfusion testing with LGE]...
November 22, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/29166955/brain-arterial-diameters-and-cognitive-performance-the-northern-manhattan-study
#17
Jose Gutierrez, Erin Kulick, Yeseon Park Moon, Chuanhui Dong, Ken Cheung, Bagci Ahmet, Yaakov Stern, Noam Alperin, Tatjana Rundek, Ralph L Sacco, Clinton B Wright, Mitchell S V Elkind
OBJECTIVES: To test the hypothesis that brain arterial diameters are associated with cognitive performance, particularly in arteries supplying domain-specific territories. METHODS: Stroke-free participants in the Northern Manhattan Study were invited to have a brain MRI from 2003-2008. The luminal diameters of 13 intracranial arterial segments were obtained using time-of-flight magnetic resonance angiogram (MRA), and then averaged and normalized into a global score and region-specific arterial diameters...
November 23, 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/29159405/management-of-tiny-unruptured-intracranial-aneurysms-a-comparative-effectiveness-analysis
#18
Ajay Malhotra, Xiao Wu, Howard P Forman, Charles C Matouk, Dheeraj Gandhi, Pina Sanelli
Importance: Unruptured intracranial aneurysms (UIAs) are relatively common in the general population and are being increasingly diagnosed; a significant proportion are tiny (≤3 mm) aneurysms. There is significant heterogeneity in practice and lack of clear guidelines on the management of incidental, tiny UIAs. It is important to quantify the implications of different management strategies in terms of health benefits to patients. Objective: To evaluate the effectiveness of routine treatment (aneurysm coiling) vs 3 strategies for imaging surveillance compared with no preventive treatment or routine follow-up of tiny UIAs...
November 20, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/29154893/an-interleaved-sequence-for-simultaneous-magnetic-resonance-angiography-mra-susceptibility-weighted-imaging-swi-and-quantitative-susceptibility-mapping-qsm
#19
Yongsheng Chen, Saifeng Liu, Sagar Buch, Jiani Hu, Yan Kang, E Mark Haacke
PURPOSE: To image the entire vasculature of the brain with complete suppression of signal from background tissue using a single 3D excitation interleaved rephased/dephased multi-echo gradient echo sequence. This ensures no loss of signal from fast flow and provides co-registered susceptibility weighted images (SWI) and quantitative susceptibility maps (QSM) from the same scan. MATERIALS AND METHODS: The suppression of background tissue was accomplished by subtracting the flow-dephased images from the flow-rephased images with the same echo time of 12...
November 14, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29154725/non-aneurysmal-subarachnoid-hemorrhage-when-is-a-second-angiography-indicated
#20
Asma Bashir, Ronni Mikkelsen, Leif Sørensen, Niels Sunde
Purpose Repeat imaging in patients with non-aneurysmal subarachnoid hemorrhage (NASAH) remains controversial. We aim to report our experience with NASAH with different hemorrhage patterns, and to investigate the need for further diagnostic workup to determine the underlying cause of hemorrhage. Method We conducted a retrospective analysis of all spontaneous SAH with an initial negative computed tomography (CT) with angiography (CTA) and/or digital subtraction angiography (DSA) from October 2011 through May 2017...
January 1, 2017: Neuroradiology Journal
keyword
keyword
9662
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"