scholarly journals Magnetic resonance imaging investigation of age‐related morphological changes in the pancreases of 226 Chinese

2021 ◽  
Author(s):  
Lu Wang ◽  
Huihui Jia ◽  
Guangwu Lin ◽  
Songbai Zheng
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Morphological Changes ◽  
Resonance Imaging ◽  
Age Related

scholarly journals Brain volumetric MRI study in healthy adolescent and young person’s using automated method

2021 ◽  
Vol 8 (9) ◽  
pp. 531-537
Author(s):  
Seda Avnioğlu ◽  
Özkan Özen
Keyword(s):  
Magnetic Resonance Imaging ◽  
White Matter ◽  
Magnetic Resonance ◽  
Morphological Changes ◽  
Young Subject ◽  
Resonance Imaging ◽  
Brain Volumes ◽  
Healthy Adolescent ◽  
Automated Method ◽  
Age Related

Objective: Adolescence is a critical period for the maturation of neurobiological processes that underlie higher cognitive functions and social and emotional behaviour. However, there are limited studies that investigated brain volumes in healthy adolescents and young persons.  The aim of this study was to compare the Grey Matter (GM), White Matter (WM) and some specific brain subcortical volumes such as hippocampus and amygdala between healthy adolescents and young groups by using VolBrain. Material and Methods: Magnetic resonance imaging brain scans were retrospectively obtained from 20 healthy adolescent and young subjects.  The mean ages of the adolescent and young persons were 13±1 and 24±2, respectively. Brain parenchyma (BP), GM, WM and asymmetry features were calculated using VolBrain, and the GM and WM volumes of each subjects were compared with those of the both groups. The current study to examine whether regional gray matter (GM), white matter (WM), cerebrospinal fluid (CSF), some brain subcortical structures volumes differed between healthy adolescent and young groups. Also, of the whole brain, hemispheres, and hippocampus, amigdala of adolescent and young subject volumes were measured with an automated method. Results: We have observed that the young group was found to have a 4 % less in volume of GM, when compared with adolescent groups. Conclusion: Our data indicate that quantitative structural Magnetic Resonance Imaging (MRI) data of the adolescent brain is important in understanding the age-related human morphological changes.

scholarly journals Increased Wall Enhancement During Follow-Up as a Predictor of Subsequent Aneurysmal Growth

Stroke ◽  
2020 ◽  
Vol 51 (6) ◽  
pp. 1868-1872 ◽  
Author(s):  
Florent Gariel ◽  
Wagih Ben Hassen ◽  
Grégoire Boulouis ◽  
Romain Bourcier ◽  
Denis Trystram ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Predictive Value ◽  
Vessel Wall ◽  
De Novo ◽  
Morphological Changes ◽  
Multivariable Analysis ◽  
Resonance Imaging ◽  
Unruptured Intracranial Aneurysms

Background and Purpose— Absence of arterial wall enhancement (AWE) of unruptured intracranial aneurysms (UIA) has shown promise at predicting which aneurysms will not rupture. We here tested the hypothesis that increased enhancement during follow-up (increased intensity, extension, or thickness or appearance of de novo enhancement), assessed using vessel wall magnetic resonance imaging, was associated with higher rates of subsequent growth. Methods— Patients with UIA were included between 2012 and 2018. Two readers independently rated AWE modification on 3T vessel wall magnetic resonance imaging, and morphological changes on time-of-flight magnetic resonance angiography during follow-up. Results— A total of 129 patients harboring 145 UIA (mean size 4.1 mm) met study criteria, of which 12 (8.3%) displayed morphological growth at 2 years. Of them, 8 demonstrated increased AWE during follow-up before or concurrently to morphological growth, and 4 had preexisting AWE that remained stable before growth. In the remaining 133 (nongrowing) UIAs, no AWE modifications were found. In multivariable analysis, increased AWE, not size, was associated with UIA growth (relative risk, 26.1 [95% CI, 7.4–91.7], P <0.001). Sensitivity, specificity, positive predictive value, and negative predictive value for UIA growth of increased AWE during follow-up were, respectively, of 67%, 100%, 96%, and 100%. Conclusions— Increased AWE during follow-up of conservatively managed UIAs predicts aneurysm growth over a 2-year period. This may impact UIA management towards closer monitoring or preventive treatment. Replication in a different setting is warranted.

scholarly journals Age-related Changes in Locus Ceruleus on Neuromelanin Magnetic Resonance Imaging at 3 Tesla

2006 ◽  
Vol 5 (4) ◽  
pp. 197-200 ◽  
Author(s):  
Eri SHIBATA ◽  
Makoto SASAKI ◽  
Koujiro TOHYAMA ◽  
Yoshiyuki KANBARA ◽  
Kotaro OTSUKA ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Locus Ceruleus ◽  
3 Tesla ◽  
Resonance Imaging ◽  
Age Related ◽  
Age Related Changes

Progression of Experimental Infantile Hydrocephalus and Effects of Ventriculoperitoneal Shunts: An Analysis Correlating Magnetic Resonance Imaging with Gross Morphology

Neurosurgery ◽  
1991 ◽  
Vol 29 (3) ◽  
pp. 329-340 ◽  
Author(s):  
James P. McAllister ◽  
Mitchell I. Cohen ◽  
Kathleen A. O'Mara ◽  
Michele H. Johnson
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Morphological Changes ◽  
Internal Capsule ◽  
Dramatic Improvement ◽  
Ventricular Enlargement ◽  
Resonance Imaging ◽  
Infantile Hydrocephalus ◽  
Lateral Ventricles ◽  
Kaolin Injection

Abstract Although previous ultrasonographic studies did monitor ventricular enlargement successfully in experimentally-induced models of feline hydrocephalus, the resolution of neuroanatomic detail was relatively poor after placement of a ventriculoperitoneal (VP) shunt because the skull had ossified over the coronal sutures. Therefore, the present study employed magnetic resonance imaging to follow the progression of ventriculomegaly more accurately, as well as to evaluate the compensatory effects of VP shunting. Hydrocephalus was induced in kittens between 7 and 10 days old by injection of kaolin into the cisterna magna. Age-matched controls received similar injections of saline. At 9 to 14 days after the kaolin injection, the hydrocephalic animals received VP shunts. Anesthetized kittens were scanned at various intervals before and after shunt placement and were killed for morphological correlation. The features observed on the magnetic resonance imaging scans were consistent with the gross morphological changes that accompanied ventricular enlargement. The lateral ventricle began to enlarge as early as 1 day after the kaolin injection, and within 3 days, both the occipital and temporal horns, along with the 4th ventricle, showed signs of moderate dilatation. By 5 days, a bilateral communication had been established through the septum pellucidum. Continued expansion of the ventricular system occurred from 6 to 20 days after injection, to the point where the cerebral cortex was reduced to less than 25% of its original thickness. The internal capsule was stretched and edematous, the caudate nucleus was compressed ventrolaterally, and the cerebellar hemispheres were eroded and/or compressed. Animals in which shunts were successfully placed demonstrated a dramatic improvement in behavior, and a reduction of about 50% in the size of the lateral ventricles within 2 days. In some cases, the lateral ventricles became slit-like within 1 week. When they were killed, about half of the animals that received shunts exhibited mild to moderate ventriculomegaly. These results indicate that magnetic resonance imaging is an excellent method for visualizing the morphological changes associated with this animal model, that these alterations occur soon after the onset of hydrocephalus, and that VP shunting can successfully reduce ventriculomegaly.

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