scholarly journals Relationship between Contrast Enhancement of the Perivascular Space in the Basal Ganglia and Endolymphatic Volume Ratio

2018 ◽  
Vol 17 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Toshio Ohashi ◽  
Shinji Naganawa ◽  
Toshio Katagiri ◽  
Kayao Kuno
Keyword(s):  
Basal Ganglia ◽  
Contrast Enhancement ◽  
Volume Ratio ◽  
Perivascular Space

Tissue Damage at Computed Tomography following Resolution of Intracerebral Hematomas

1986 ◽  
Vol 27 (5) ◽  
pp. 495-500 ◽  
Author(s):  
E. B. Skriver ◽  
T. S. Olsen
Keyword(s):  
Computed Tomography ◽  
Basal Ganglia ◽  
Intracerebral Hemorrhage ◽  
Contrast Enhancement ◽  
Tissue Damage ◽  
Intracerebral Hematoma ◽  
Ventricular Enlargement ◽  
Spontaneous Intracerebral Hemorrhage ◽  
Adjacent Structures ◽  
Area 6

Tissue damage as sequelae after spontaneous intracerebral hemorrhage in eight consecutive patients was investigated with computed tomography performed 3 days, 2 weeks and 6 months after the stroke. The presence of contrast enhancement after 2 weeks, hypodense areas after 6 months, and atrophy of adjacent structures were considered to be markers of irreversible tissue damage. Except for a narrow zone in the periphery of the hematoma (ring blush) contrast enhancement was not observed, neither in the hematoma nor in areas where resolution had taken place. After 6 months the site of the hematomas was not identifiable in 3 patients, and 4 patients had small ‘lacunar’ hypodense lesions. Only one patient had a more extensive hypodense area 6 months after the hemorrhage. The most prominent sequelae after intracerebral hematoma were atrophy of adjacent structures (i.e. atrophy of basal ganglia, thalamus and ventricular enlargement) which were seen in all patients even though irreversible de loco damage in the hematoma area was sparse or absent.

scholarly journals Normal-sized basal ganglia perivascular space related to motor phenotype in Parkinson freezers

Aging ◽  
2021 ◽  
Author(s):  
Wen Lv ◽  
Yumei Yue ◽  
Ting Shen ◽  
Xingyue Hu ◽  
Lili Chen ◽  
...  
Keyword(s):  
Basal Ganglia ◽  
Perivascular Space ◽  
Motor Phenotype

scholarly journals The influence of extremely low-frequency electromagnetic field on the basal ganglia structures of the rat brain

2011 ◽  
pp. 27-38 ◽  
Author(s):  
Igor Gojkovic ◽  
Smiljana Paras ◽  
Radoslav Gajanin ◽  
Milica Matavulj ◽  
Vesna Rajkovic ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Basal Ganglia ◽  
Low Frequency ◽  
Volume Ratio ◽  
Volume Density ◽  
Subcortical Structures ◽  
Extremely Low Frequency ◽  
Wistar Strain ◽  
Basal Ganglia Structures ◽  
Sexually Mature

We studied the influence of extremely low-frequency electromagnetic field (ELF EMF) to subcortical structures of a brain, i.e. basal ganglia, of sexually mature rats of Wistar strain. The animals were exposed to nonhomogenous ELF EMF, intensity of 50-500 ?T, 50 Hz frequency, 7 hours a day, and 5 days a week during three months. Histological and stereological analysis established a reduction in volume density of ganglia cells in the area of basal ganglia, an increase of their nucleo-cytoplasmatic volume ratio, and presence of an intensive edema of pericellular (perineural) type.

Abstract WP211: The Association Between Arterial Stiffness and Perivascular Space Topography in Stroke Patients

Stroke ◽  
2016 ◽  
Vol 47 (suppl_1) ◽  
Author(s):  
Jae-Han Bae ◽  
Kwang-Yeol Park ◽  
Jeong-Min Kim ◽  
Moo-Suk Park
Keyword(s):  
Basal Ganglia ◽  
Arterial Stiffness ◽  
Confidence Interval ◽  
Odds Ratio ◽  
Laboratory Data ◽  
Multivariate Logistic Regression Analysis ◽  
Perivascular Space ◽  
University Hospital ◽  
Centrum Semiovale ◽  
High Degree

Background: Arterial stiffness aggravation is known to increase cerebral small vessel disease burden. We investigated the association between brachial-ankle pulse wave velocity (baPWV) and the topography of MRI visible perivascular space in acute stroke population. Method: We analyzed clinical and laboratory data of acute ischemic stroke or transient ischemic attack patients who had been admitted to Chung-Ang University Hospital within 7 days after symptom onset between January 1st 2014 and May 31th 2015. We included those patients who underwent both brain MR imaging including T2 weighted sequence and baPWV. The topography of perivascular space was examined in basal ganglia and centrum semiovale level with validating scale (score 0-4), and dichotomized as low (score3). Result: A total of 481 patients were included (mean age 68.2±12.3, 44.7% male). When the distribution of baPWV were divided into quartile, the proportions of high PVS in basal ganglia was 10%, 20%, 40% and 40%, respectively. The proportion of high PVS in centrum semiovale was 20%, 40%, 36%, and 49%, respectively. Multivariate logistic regression analysis revealed that the high degree of basal ganglia PVS was associated with baPWV>2255cm/s (odds ratio 1.7, confidence interval 1.0-2.7, p=0.048) after adjusting age>70 years, hypertension, current smoking status and previous stroke history. The high degree of centrum semiovale PVS showed marginal association with baPWV>2255cm/s (odds ratio=1.4, confidence interval 0.9-2.3, p=0.137) after adjusting age>70 years and hypertension. Conclusion: Our pilot study suggests potential pathophysiological association between arterial stiffness and PVS topography.

scholarly journals Insulin Resistance Is Independently Associated With Enlarged Perivascular Space in the Basal Ganglia in Nondiabetic Healthy Elderly Population

2020 ◽  
Vol 35 ◽  
pp. 153331752091212
Author(s):  
Danhong Wu ◽  
Xiaoli Yang ◽  
Ping Zhong ◽  
Xiaofei Ye ◽  
Chen Li ◽  
...  
Keyword(s):  
Risk Factors ◽  
Insulin Resistance ◽  
Basal Ganglia ◽  
Elderly Population ◽  
Resistance Index ◽  
Perivascular Space ◽  
Model Assessment ◽  
Logistic Analysis ◽  
Healthy Elderly ◽  
Level Scale

Objectives: To investigate the association between insulin resistance (IR) and enlarged perivascular space (EPVS) in the basal gangliain nondiabetic healthy elderly population. Methods: A total of 235 nondiabetic healthy elderly population were recruited. A 3-level scale was used to evaluate the burden of EPVSs. The homeostasis model assessment–estimated insulin resistance index (HOMA-IR) was used for IR estimation. Correlation between IR and severity of EPVS was assessed using the regression model after adjusting demographics and cardiovascular risk factors. Results: The top quartile of HOMA-IR was 2.52, and 25.11% of patients showed IR. The proportion of patients with IR was higher in the moderate to severe EPVS group than in the mild group (36.51% vs 20.93%, P = .015). In multivariate logistic analysis, IR was positively correlated with the moderate to severe EPVS (adjusted odds ratio: 3.532, 95% confidence interval: 1.633-7.636, P = .001) after adjusting classical risk factors. Conclusions: Insulin resistance was independently correlated with EPVS in the basal ganglia in nondiabetic healthy elderly population.

scholarly journals Gd-based Contrast Enhancement of the Perivascular Spaces in the Basal Ganglia

2017 ◽  
Vol 16 (1) ◽  
pp. 61-65 ◽  
Author(s):  
Shinji Naganawa ◽  
Toshiki Nakane ◽  
Hisashi Kawai ◽  
Toshiaki Taoka
Keyword(s):  
Basal Ganglia ◽  
Contrast Enhancement ◽  
Perivascular Spaces

An Energy Analyser for Contrast Enhancement in STEM

1974 ◽  
Vol 32 ◽  
pp. 434-435
Author(s):  
H.T. Pearce-Percy
Keyword(s):  
Contrast Enhancement ◽  
Bending Angle ◽  
Magnetic Sector ◽  
Conventional Design ◽  
Bending Radius ◽  
Sector Type

Recently an energy analyser of the uniform magnetic sector type has been installd in a 100KV microscope. This microscope can be used in the STEM mode. The sector is of conventional design (Fig. 1). The bending angle was chosen to be 90° for ease of construction. The bending radius (ρ) is 20 cm. and the object and image distances are 42.5 cm. and 30.0 cm. respectively.

TEM observation of iron oxide pillars in montmorillonite

1990 ◽  
Vol 48 (4) ◽  
pp. 882-883
Author(s):  
H. Mori ◽  
Y. Murata ◽  
H. Yoneyama ◽  
H. Fujita
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Fine Particles ◽  
Aqueous Suspension ◽  
Volume Ratio ◽  
Exchange Capacity ◽  
Nano Composites ◽  
Pillared Montmorillonite ◽  
Topographic Features ◽  
Transmission Electron

Recently, a new sort of nano-composites has been prepared by incorporating such fine particles as metal oxide microcrystallites and organic polymers into the interlayer space of montmorillonite. Owing to their extremely large specific surface area, the nano-composites are finding wide application[1∼3]. However, the topographic features of the microstructures have not been elucidated as yet In the present work, the microstructures of iron oxide-pillared montmorillonite have been investigated by high-resolution transmission electron microscopy.Iron oxide-pillared montmorillonite was prepared through the procedure essentially the same as that reported by Yamanaka et al. Firstly, 0.125 M aqueous solution of trinuclear acetato-hydroxo iron(III) nitrate, [Fe3(OCOCH3)7 OH.2H2O]NO3, was prepared and then the solution was mixed with an aqueous suspension of 1 wt% clay by continuously stirring at 308 K. The final volume ratio of the latter aqueous solution to the former was 0.4. The clay used was sodium montmorillonite (Kunimine Industrial Co.), having a cation exchange capacity of 100 mequiv/100g. The montmorillonite in the mixed suspension was then centrifuged, followed by washing with deionized water. The washed samples were spread on glass plates, air dried, and then annealed at 673 K for 72 ks in air. The resultant film products were approximately 20 μm in thickness and brown in color.

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