scholarly journals Magnetic resonance imaging of the placenta: a systematic approach to the description of normal placenta

2020 ◽  
Vol 7 (5) ◽  
pp. 81-90
Author(s):  
A. V. Fokin ◽  
E. S. Semenova ◽  
E. D. Vyshedkevich ◽  
E. S. Shelepova ◽  
G. G. Romanov ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Pregnant Women ◽  
Systematic Approach ◽  
Diagnostic Methods ◽  
Resonance Imaging ◽  
Prenatal Magnetic Resonance Imaging ◽  
Design And Methods ◽  
Normal Placenta

Background. Currently, one of the topical issues of prenatal magnetic resonance imaging is accurate and timely diagnosis of pathological conditions of extrafetal structures of the fetus. In particular, the most acute problem is the need to improve the diagnostic accuracy of recognition and differentiation of placental adhesive-invasive pathology (PAIP). In the literature, there is no unified approach to the methodology and description of MRI examination of the placenta. Objective. To improve the diagnostic methods of the method of magnetic resonance imaging for the study of the placenta. Design and methods. A total of 293 MRI studies of the small pelvis of pregnant women aged 22 to 45 years (average — 35 years), in gestational age from 14 to 38 weeks (average 36 weeks) were performed and analyzed. Results. A clinical three-stage method of MRI of the placenta and an algorithm for systematized description of MRI of the placenta of pregnant women have been developed and implemented. Conclusion. The developed systematic approach to the study of the placenta will help improve the capabilities of the MRI method for examining the placenta in connection with the demand for accurate and correct interpretation of this organ in vivo.

Application of Magnetic Resonance Imaging Based on Fe3O4 Nanoparticles in the Treatment of Cerebrovascular Diseases

2021 ◽  
Vol 21 (2) ◽  
pp. 843-851
Author(s):  
Xinxin Qi ◽  
Ming Yao ◽  
Mei Jin ◽  
Haoyou Guo
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Disease Diagnosis ◽  
Cerebrovascular Diseases ◽  
Diagnostic Methods ◽  
Diagnosis And Treatment ◽  
Resonance Imaging ◽  
Imaging Technology ◽  
Inorganic Nanomaterials

Due to its high stability and excellent performance, inorganic nanomaterials have attracted much attention in the research of disease diagnosis and treatment. Focusing on inorganic nanomaterials, high-temperature pyrolysis has been used to successfully prepare Fe3O4 nanoparticles with different particle sizes. The diagnosis and treatment of Alzheimer’s disease have advanced, and many new diagnostic methods have been adopted clinically. In this paper, Fe3O4 nanoparticle magnetic resonance imaging technology is used to explore the application of magnetic Fe3O4 inorganic nanomaterials in cerebrovascular diseases in vivo. The results show that SWI has higher sensitivity and semi-quantitative advantages than traditional T2WI imaging technology. With different critical SWI concentrations, this article lays the experimental foundation for the clinical progress of inorganic nanomaterials and plays an important role in the treatment of cerebrovascular diseases.

Monitoring stem cell migration in the nervous system by in vivo magnetic resonance imaging

2005 ◽  
Vol 25 (1_suppl) ◽  
pp. S692-S692
Author(s):  
Mathias Hoehn ◽  
Uwe Himmelreich ◽  
Ralph Weber ◽  
Pedro Ramos-Cabrer ◽  
Susanne Wegener ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Nervous System ◽  
Stem Cell ◽  
Cell Migration ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Stem Cell Migration

Сauses of Dizziness in Patients with Suspected Stroke

2018 ◽  
Vol 7 (3) ◽  
pp. 217-221
Author(s):  
E. V. Shevchenko ◽  
G. R. Ramazanov ◽  
S. S. Petrikov
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Demyelinating Disease ◽  
Heart Rhythm ◽  
Diagnostic Methods ◽  
Deficiency Anemia ◽  
Resonance Imaging ◽  
Peripheral Vestibulopathy ◽  
Suspected Stroke ◽  
The Brain

Background Acute dizziness may be the only symptom of stroke. Prevalence of this disease among patients with isolated dizziness differs significantly and depends on study design, inclusion criteria and diagnostic methods. In available investigations, we did not find any prospective studies where magnetic resonance imaging, positional maneuvers, and Halmagyi-Curthoys test had been used to clarify a pattern of diseases with isolated acute dizziness and suspected stroke.Aim of study To clarify the pattern of the causes of dizziness in patients with suspected acute stroke.Material and methods We examined 160 patients admitted to N.V. Sklifosovsky Research Institute for Emergency Medicine with suspected stroke and single or underlying complaint of dizziness. All patients were examined with assessment of neurological status, Dix-Hollpike and Pagnini-McClure maneuvers, HalmagyiCurthoys test, triplex scans of brachiocephalic arteries, transthoracic echocardiography, computed tomography (CT) and magnetic resonance imaging (MRI) of the brain with magnetic field strength 1.5 T. MRI of the brain was performed in patients without evidence of stroke by CT and in patients with stroke of undetermined etiology according to the TOAST classification.Results In 16 patients (10%), the cause of dizziness was a disease of the brain: ischemic stroke (n=14 (88%)), hemorrhage (n=1 (6%)), transient ischemic attack (TIA) of posterior circulation (n=1 (6%)). In 70.6% patients (n=113), the dizziness was associated with peripheral vestibulopathy: benign paroxysmal positional vertigo (n=85 (75%)), vestibular neuritis (n=19 (17%)), Meniere’s disease (n=7 (6%)), labyrinthitis (n=2 (1,3%)). In 6.9% patients (n=11), the cause of dizziness was hypertensive encephalopathy, 1.9% of patients (n=3) had heart rhythm disturbance, 9.4% of patients (n=15) had psychogenic dizziness, 0.6% of patients (n=1) had demyelinating disease, and 0.6% of patients (n=1) had hemic hypoxia associated with iron deficiency anemia.Conclusion In 70.6% patients with acute dizziness, admitted to hospital with a suspected stroke, peripheral vestibulopathy was revealed. Only 10% of patients had a stroke as a cause of dizziness.

Supramolecular Enhancement of Aminoxyl ORCA Contrast Agents

2019 ◽  
Author(s):  
Hamilton Lee ◽  
Jenica Lumata ◽  
Michael A. Luzuriaga ◽  
Candace Benjamin ◽  
Olivia Brohlin ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Side Effects ◽  
Magnetic Resonance ◽  
Tobacco Mosaic Virus ◽  
Contrast Agents ◽  
Single Molecule ◽  
Organic Radical ◽  
Resonance Imaging ◽  
Physiological Conditions

<div><div><div><p>Many contrast agents for magnetic resonance imaging are based on gadolinium, however side effects limit their use in some patients. Organic radical contrast agents (ORCAs) are potential alternatives, but are reduced rapidly in physiological conditions and have low relaxivities as single molecule contrast agents. Herein, we use a supramolecular strategy where cucurbit[8]uril binds with nanomolar affinities to ORCAs and protects them against biological reductants to create a stable radical in vivo. We further over came the weak contrast by conjugating this complex on the surface of a self-assembled biomacromolecule derived from the tobacco mosaic virus.</p></div></div></div>

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