scholarly journals Contrast Enhancement of the Anterior Eye Segment and Subarachnoid Space: Detection in the Normal State by Heavily T2-weighted 3D FLAIR

2011 ◽  
Vol 10 (3) ◽  
pp. 193-199 ◽  
Author(s):  
Shinji NAGANAWA ◽  
Masahiro YAMAZAKI ◽  
Hisashi KAWAI ◽  
Michihiko SONE ◽  
Tsutomu NAKASHIMA
Keyword(s):  
Contrast Enhancement ◽  
Normal State ◽  
Subarachnoid Space ◽  
Anterior Eye Segment ◽  
3D Flair

scholarly journals Evaluation of Leptomeningeal Contrast Enhancement Using Pre-and Postcontrast Subtraction 3D-FLAIR Imaging in Multiple Sclerosis

2018 ◽  
Vol 39 (4) ◽  
pp. 642-647 ◽  
Author(s):  
R. Zivadinov ◽  
D.P. Ramasamy ◽  
J. Hagemeier ◽  
C. Kolb ◽  
N. Bergsland ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Contrast Enhancement ◽  
Flair Imaging ◽  
3D Flair

scholarly journals Meningeal blood–brain barrier disruption in acute traumatic brain injury

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Lisa Christine Turtzo ◽  
Neekita Jikaria ◽  
Martin R Cota ◽  
Joshua P Williford ◽  
Victoria Uche ◽  
...  
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Contrast Enhancement ◽  
Mild Traumatic Brain Injury ◽  
Subarachnoid Space ◽  
Meningeal Enhancement ◽  
Contrast Enhanced ◽  
Acute Traumatic Brain Injury ◽  
The Brain ◽  
Contrast Enhanced Mri

Abstract The meninges serve as a functional barrier surrounding the brain, critical to the immune response, and can be compromised following head trauma. Meningeal enhancement can be detected on contrast-enhanced MRI in patients presenting with acute traumatic brain injury, even when head CT is negative. Following head trauma, gadolinium-based contrast appears to extravasate from the vasculature, enhancing the dura within minutes, and later permeates the subarachnoid space. The aims of this study were to characterize the initial kinetics of the uptake of contrast agent after injury and the delayed redistribution of contrast enhancement in the subarachnoid space in hyperacute patients. Neuroimaging was obtained prospectively in two large ongoing observational studies of patients aged 18 years or older presenting to the emergency department with suspected acute head injury. Dynamic contrast-enhanced MRI studies in a cohort of consecutively enrolling patients with mild traumatic brain injury (n = 36) determined that the kinetic half-life of dural-related meningeal enhancement was 1.3 ± 0.6 min (95% enhancement within 6 min). The extravasation of contrast into the subarachnoid space was investigated in a cohort of CT negative mild traumatic brain injury patients initially imaged within 6 h of injury (hyperacute) who subsequently underwent a delayed MRI, with no additional contrast administration, several hours after the initial MRI. Of the 32 patients with delayed post-contrast imaging, 18 (56%) had conspicuous expansion of the contrast enhancement into the subarachnoid space, predominantly along the falx and superior sagittal sinus. Patients negative for traumatic meningeal enhancement on initial hyperacute MRI continued to have no evidence of meningeal enhancement on the delayed MRI. These studies demonstrate that (i) the initial enhancement of the traumatically injured meninges occurs within minutes of contrast injection, suggesting highly permeable meningeal vasculature, and that (ii) contrast in the meninges redistributes within the subarachnoid space over the period of hours, suggesting a compromise in the blood–brain and/or blood-cerebrospinal barriers. Data from the parent study indicate that up to one in two patients with mild traumatic brain injury have traumatic brain injury on acute (<48 h) MRI, with a higher prevalence seen in patients with moderate or severe traumatic brain injury. The current study’s findings of traumatic meningeal enhancement and the subsequent delayed extravasation of contrast into the subarachnoid spaces indicate that a substantial percentage of patients with even mild traumatic brain injury may have a transient disruption in barriers separating the vasculature from the brain.

scholarly journals Contrast Enhancement of the Normal Infundibular Recess Using Heavily T2-weighted 3D FLAIR

2021 ◽  
Author(s):  
Iichiro Osawa ◽  
Eito Kozawa ◽  
Yuya Yamamoto ◽  
Sayuri Tanaka ◽  
Taira Shiratori ◽  
...  
Keyword(s):  
Contrast Enhancement ◽  
Infundibular Recess ◽  
3D Flair

scholarly journals Contrast-Enhancement of the Anterior Eye Segment in Patients with Retinoblastoma: Correlation between Clinical, MR Imaging, and Histopathologic Findings

2009 ◽  
Vol 31 (2) ◽  
pp. 237-245 ◽  
Author(s):  
P. de Graaf ◽  
P. van der Valk ◽  
A.C. Moll ◽  
S.M. Imhof ◽  
A.Y.N. Schouten-van Meeteren ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Contrast Enhancement ◽  
Anterior Eye Segment ◽  
Histopathologic Findings

Observation of contrast enhancement in the cochlear fluid space of healthy subjects using a 3D-FLAIR sequence at 3 Tesla

2005 ◽  
Vol 16 (3) ◽  
pp. 733-737 ◽  
Author(s):  
Shinji Naganawa ◽  
Tomomi Komada ◽  
Hiroshi Fukatsu ◽  
Takeo Ishigaki ◽  
Osamu Takizawa
Keyword(s):  
Contrast Enhancement ◽  
Healthy Subjects ◽  
3 Tesla ◽  
Flair Sequence ◽  
3D Flair

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.

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