Inter- and intraoperator reliability of brain tissue measures using magnetic resonance imaging

2003 ◽  
Vol 253 (6) ◽  
pp. 301-306 ◽  
Author(s):  
Gaku Okugawa ◽  
Katsunori Takase ◽  
Kenji Nobuhara ◽  
Tsunetaka Yoshida ◽  
Tomohisa Minami ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Brain Tissue ◽  
Resonance Imaging

Brain Tissue Volume Measurement from Magnetic Resonance Imaging A Phantom Study

1993 ◽  
Vol 28 (10) ◽  
pp. 890-895 ◽  
Author(s):  
HENRY RUSINEK ◽  
RAMESH CHANDRA
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Brain Tissue ◽  
Volume Measurement ◽  
Phantom Study ◽  
Resonance Imaging ◽  
Tissue Volume

scholarly journals Modern Imaging Modalities in the Assessment of Acute Stroke

Folia Medica ◽  
2014 ◽  
Vol 56 (2) ◽  
pp. 81-87 ◽  
Author(s):  
Dora K. Zlatareva ◽  
Nikoleta I. Traykova
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
At Risk ◽  
Magnetic Resonance ◽  
Acute Stroke ◽  
Brain Tissue ◽  
Ct Angiography ◽  
Imaging Modalities ◽  
Minor Stroke ◽  
Resonance Imaging

Abstract The AIM of this review was to present the modern concepts of diagnostic imaging in acute stroke. Neuroimaging in acute stroke aims at diagnosing the condition as early as possible and assessing the extent of parenchymal perfusion and the intracranial vessels patency. A modern approach would involve a combination of various imaging modalities as multidetector computed tomography and high field magnetic resonance imaging. A non-enhanced computed tomography (CT) is used to detect hemorrhage or to identify early signs of ischemic stroke. CT angiography finds evidence of intravascular thrombi or significant stenoses, and CT perfusion displays brain tissue at risk of irreversible alterations that can be salvaged therapeutically. Magnetic resonance imaging (MRI) is a more sensitive modality than CT in diagnosing acute brain ischemia. MR diffusion-weighted imaging is more sensitive than conventional MR sequences in hyperacute stage. MR angiography as a non-invasive and non-ionizing imaging method is used as an alternative modality to CT angiography. To find brain tissue at risk diffusion- and perfusion-weighted magnetic resonance imaging modalities are used. The authors present briefly the modern neuroimaging modalities used in patients with transient ischemic attack, minor stroke and venous infarction. By combining different imaging techniques in a multimodal approach we can acquire the information necessary for therapeutic planning and differentiate patients who need thrombolysis.

scholarly journals Depressive Symptomatology, Racial Discrimination Experience, and Brain Tissue Volumes Observed on Magnetic Resonance Imaging

2019 ◽  
Vol 188 (4) ◽  
pp. 656-663
Author(s):  
Craig S Meyer ◽  
Pamela J Schreiner ◽  
Kelvin Lim ◽  
Harsha Battapady ◽  
Lenore J Launer
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Racial Discrimination ◽  
Brain Tissue ◽  
Depressive Symptomatology ◽  
Resonance Imaging

1H magnetic resonance imaging of normal brain tissue response to photodynamic therapy

Neurosurgery ◽  
1991 ◽  
pp. 538 ◽  
Author(s):  
Q Jiang ◽  
R A Knight ◽  
M Chopp ◽  
J A Helpern ◽  
R J Ordidge ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Photodynamic Therapy ◽  
Magnetic Resonance ◽  
Brain Tissue ◽  
Tissue Response ◽  
Normal Brain ◽  
Resonance Imaging ◽  
Normal Brain Tissue

Automatic Brain Tissue Extraction Method Using Erosion-Dilation Treatment (BREED) From Three-Dimensional Magnetic Resonance Imaging T1-Weighted Data

2002 ◽  
Vol 26 (6) ◽  
pp. 927-932 ◽  
Author(s):  
Naoki Miura ◽  
Akito Taneda ◽  
Kazuhito Shida ◽  
Ryuta Kawashima ◽  
Yoshiyuki Kawazoe ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Brain Tissue ◽  
Extraction Method ◽  
Three Dimensional ◽  
Resonance Imaging ◽  
Tissue Extraction ◽  
Weighted Data

scholarly journals Dynamic contrast-enhanced magnetic resonance imaging may act as a biomarker for vascular damage in normal appearing brain tissue after radiotherapy in patients with glioblastoma

2018 ◽  
Vol 7 (11) ◽  
pp. 205846011880881 ◽  
Author(s):  
Markus Fahlström ◽  
Samuel Fransson ◽  
Erik Blomquist ◽  
Tufve Nyholm ◽  
Elna-Marie Larsson
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Radiation Dose ◽  
Brain Tissue ◽  
Tissue Type ◽  
Resonance Imaging ◽  
Dce Mri ◽  
Dynamic Contrast Enhanced ◽  
Contrast Enhanced ◽  
Radiation Induced

Background Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) is a promising perfusion method and may be useful in evaluating radiation-induced changes in normal-appearing brain tissue. Purpose To assess whether radiotherapy induces changes in vascular permeability (Ktrans) and the fractional volume of the extravascular extracellular space (Ve) derived from DCE-MRI in normal-appearing brain tissue and possible relationships to radiation dose given. Material and Methods Seventeen patients with glioblastoma treated with radiotherapy and chemotherapy were included; five were excluded because of inconsistencies in the radiotherapy protocol or early drop-out. DCE-MRI, contrast-enhanced three-dimensional (3D) T1-weighted (T1W) images and T2-weighted fluid attenuated inversion recovery (T2-FLAIR) images were acquired before and on average 3.3, 30.6, 101.6, and 185.7 days after radiotherapy. Pre-radiotherapy CE T1W and T2-FLAIR images were segmented into white and gray matter, excluding all non-healthy tissue. Ktrans and Ve were calculated using the extended Kety model with the Parker population-based arterial input function. Six radiation dose regions were created for each tissue type, based on each patient’s computed tomography-based dose plan. Mean Ktrans and Ve were calculated over each dose region and tissue type. Results Global Ktrans and Ve demonstrated mostly non-significant changes with mean values higher for post-radiotherapy examinations in both gray and white matter compared to pre-radiotherapy. No relationship to radiation dose was found. Conclusion Additional studies are needed to validate if Ktrans and Ve derived from DCE-MRI may act as potential biomarkers for acute and early-delayed radiation-induced vascular damages. No dose-response relationship was found.

1H Magnetic Resonance Imaging of Normal Brain Tissue Response to Photodynamic Therapy

Neurosurgery ◽  
1991 ◽  
Vol 29 (4) ◽  
pp. 538-543 ◽  
Author(s):  
Quan Jiang ◽  
Robert A. Knight ◽  
Michael Chopp ◽  
J. A. Helpern ◽  
Roger J. Ordidge ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Photodynamic Therapy ◽  
Magnetic Resonance ◽  
Brain Tissue ◽  
Tissue Response ◽  
Normal Brain ◽  
Resonance Imaging ◽  
Normal Brain Tissue

scholarly journals Simulating Local Deformations in the Human Cortex Due to Blood Flow-Induced Changes in Mechanical Tissue Properties: Impact on Functional Magnetic Resonance Imaging

2021 ◽  
Vol 15 ◽  
Author(s):  
Mahsa Zoraghi ◽  
Nico Scherf ◽  
Carsten Jaeger ◽  
Ingolf Sack ◽  
Sebastian Hirsch ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Blood Flow ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Brain Tissue ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Tissue Properties ◽  
The Relationship ◽  
The Brain

Investigating human brain tissue is challenging due to the complexity and the manifold interactions between structures across different scales. Increasing evidence suggests that brain function and microstructural features including biomechanical features are related. More importantly, the relationship between tissue mechanics and its influence on brain imaging results remains poorly understood. As an important example, the study of the brain tissue response to blood flow could have important theoretical and experimental consequences for functional magnetic resonance imaging (fMRI) at high spatial resolutions. Computational simulations, using realistic mechanical models can predict and characterize the brain tissue behavior and give us insights into the consequent potential biases or limitations of in vivo, high-resolution fMRI. In this manuscript, we used a two dimensional biomechanical simulation of an exemplary human gyrus to investigate the relationship between mechanical tissue properties and the respective changes induced by focal blood flow changes. The model is based on the changes in the brain’s stiffness and volume due to the vasodilation evoked by neural activity. Modeling an exemplary gyrus from a brain atlas we assessed the influence of different potential mechanisms: (i) a local increase in tissue stiffness (at the level of a single anatomical layer), (ii) an increase in local volume, and (iii) a combination of both effects. Our simulation results showed considerable tissue displacement because of these temporary changes in mechanical properties. We found that the local volume increase causes more deformation and consequently higher displacement of the gyrus. These displacements introduced considerable artifacts in our simulated fMRI measurements. Our results underline the necessity to consider and characterize the tissue displacement which could be responsible for fMRI artifacts.

scholarly journals Radiološke slikovnopreiskovalne metode pri akutni možganski kapi

2015 ◽  
Vol 84 (1) ◽  
Author(s):  
Katarina Šurlan Popovič ◽  
Urška Lamot
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Acute Stroke ◽  
Brain Tissue ◽  
Comprehensive Evaluation ◽  
Accurate Information ◽  
Resonance Imaging ◽  
Imaging Evaluation ◽  
Magnetic Resonance Perfusion

Stroke is the third most common cause of death in the developed world and the leading cause of adult disability. The goals of an imaging evaluation for acute stroke when presented with patients with raised clinical suspicion of an acute stroke are to obtain accurate information about the momentary state of brain tissue. A comprehensive evaluation is best achieved with a combination of computed tomography or magnetic resonance imaging technique. Unenhanced computed tomography and magnetic resonance imaging can help rule out hemorrhage and identify early morphologic signs of acute brain ischemia. Computed tomography and magnetic resonance perfusion imaging and magnetic resonance diffusion weight imaging, can help depict unsalvageable ischemic brain tissue and the area of penumbra. Computed tomography angiography and magnetic resonance angiography are widely used techniques for assessment of both, the intracranial and neck circulation.

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