CT and MRI are imaging modalities used to visualize structures in the body. CT uses X-rays while MRI uses strong magnetic fields and radio waves. CT provides spatial detail of bones and some soft tissues. MRI has better contrast resolution and does not use ionizing radiation, allowing it to distinguish between soft tissues and detect abnormalities. Different MRI sequences such as T1-weighted and T2-weighted images provide contrast between tissues like fat, water, and pathology. Functional MRI techniques examine brain activity through blood oxygenation levels.
Anatomy of Brain by MRI
In this presentation we will discuss the cross sectional anatomy of brain. Then we will discuss the Most common diseases to be evaluated by brain imaging.
In my opinion this presentation is a road map for beginars.
Magnetic resonance imaging (MRI) is an imaging technique used primarily in medical settings to produce high quality images of the soft tissues of the human body.
Anatomy of Brain by MRI
In this presentation we will discuss the cross sectional anatomy of brain. Then we will discuss the Most common diseases to be evaluated by brain imaging.
In my opinion this presentation is a road map for beginars.
Magnetic resonance imaging (MRI) is an imaging technique used primarily in medical settings to produce high quality images of the soft tissues of the human body.
This slide includes various neuroimaging methods. Firstly, brief backgrounds of positron emission tomography (PET), diffusion tensor MRI, voxel-based morphometry will be introduced. Secondly, a theoretical explanation of BOLD fMRI and preprocessing will be introduced.
http://skyeong.net
This slide will provide a tutorial for preprocessing of fMRI data. The step-by-step process will be provided.
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http:/skyeong.net
These are slides for an introductory lecture on fMRI/MRI and analysis of fMRI data. The corresponding tutorial is available on my website kathiseidlrathkopf.com
A simple introduction to fMRI study design for social science and other researchers outside the field who might want to design a study using fMRI brain scanning technology
This presentation discusees a brief history of the MRI, it's mechanism of action, applications in dentistry and recent advancements in its technology. Also it's advantages and disadvantages in comparison with the CT scan
Significance of Brain imaging in Psychiatry. Most of the major Psychiatric disorders are associated with statistically significant differences on various Neuroimaging measures, when comparing groups of patients and controls.
Second year PG Resident of I Q City Medical College and Hospital, Durgapur, West Bengal.
Covers the scope and use of Imaging technology in Orthopaedics.
Medical imaging is the technique and process of creating visual representations of the interior of a body for clinical analysis and medical intervention, as well as visual representation of the function of some organs or tissues (physiology).
8. What is a MRI? MRI stands for magnetic resonance imaging. A MRI scanner has a magnetic field that is frequently up to 60,000 times as strong as Earth’s magnetic field! MRI equipment is expensive. 1.5 tesla scanners often cost between $1 million and $1.5 million USD. 3.0 tesla scanners often cost between $2 million and $2.3 million USD. Construction of MRI suites can cost up to $500,000 USD, or more, depending on project scope. Dangers of MRI's Video: http://www.youtube.com/watch?v=_lBxYtkh4ts
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17. Pooley, R. A. Radiographics 2005;25:1087-1099 T1-weighted contrast In the brain T 1 -weighted scans provide good gray matter/white matter contrast , in other words put simply, T1 Weighted Images highlights fat deposition. Types of MRI images: T1WI
18. Pooley, R. A. Radiographics 2005;25:1087-1099 T2-weighted contrast Types of MRI images: T2WI T2 images are particularly well suited to edema as they are sensitive to water content (edema is characterized by increased water content). In other words, put more simply, T2 weighted images light up liquid on the images being visualized .
19. Magnetic Resonance Angiography (MRA) is a group of techniques based on Magnetic Resonance Imaging (MRI) to image blood vessels . MRA generates pictures of the arteries to evaluate them for stenosis (abnormal narrowing) or aneurysms (vessel wall dilatations, at risk of rupture). A variety of techniques can be used to generate the pictures, such as administration of a paramagnetic contrast agent ( gadolinium, Gd ). Types of MRI images: Magnetic resonance angiography (MRA) Magnetic Resonance Angiography: Maximum intensity projection of an MRA covering from the top of the heart to just below the circle of Willis MRA showing the circle of Willis in the brain.
20. Material to read latter-T 1 vs T 2 MRI: Tissue Appearance WT FAT H2O MUSC LIG BONE T1 B D I D D Proton Density I I I D D T2 I B I D D
32. Wilson’s disease Das SK and Ray K (2006) Wilson's disease: an update Nat Clin Pract Neurol 2: 482 – 493 10.1038/ncpneuro0291 Hyperintensities due to copper deposition in the bilateral basal ganglia and thalami shown by T2-weighted MRI of the brain
33. Radiology: Glioblastoma is usually seen as a grossly heterogeneous mass . R ing enhancement surrounding a necrotic center is the most common presentation, but there may be multiple rings. Characterized by irregular ring-enhancement surrounding a central non-enhancing region of necrosis . Note the shaggy inner-margin of the ring, and the remarkable variation in its thickness. The small foci of internal enhancement represent islands of living tumor within the regions of necrosis . Surrounding vasogenic edema can be impressive, and adds significantly to the mass effect. Glioblastoma multiforme ( GBM) Axial Gd Enhanced T1W MRI Axial T2W MRI
34. MRI appearance two months after whole brain radiation (small lesions gone and large lesion much smaller) Metastatic brain tumors
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37. Multiple sclerosis (MS) Axial Gd Enhanced T1W MR Axial T2W MR MRI imaging of the brain Gd enhanced helps diagnose MS. Typical MS white matter lesions are bright lesions on T2-weighted image (left image), especially in the corpus callosum and periventricular regions. T2W axial T2W sagittal
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Editor's Notes
Figure MRI of childs head
Figure Left CT scan showing intracranial tumor
Axial plane CT vs MRI of brain tumor, same subject-mri clearly has better contrast resolution.
Dystonia caused by defect in copper excretion
WHO Grade IV Cell of Origin: ASTROCYTE Synonyms: GBM, glioblastoma multiforme, spongioblastoma multiforme Common Locations: cerebral hemispheres, occasionally elsewhere (brainstem, cerebellum, cord) Demographics: peak from 45-60 years Histology: grossly heterogeneous, degeneration, necrosis and hemorrhage are common Special Stains: GFAP varies, often present in areas of better differentiation Progression : Can't get any worse. Radiology: Glioblastoma is usually seen as a grossly heterogeneous mass. Ring enhancement surrounding a necrotic center is the most common presentation, but there may be multiple rings. Surrounding vasogenic edema can be impressive, and adds significantly to the mass effect. Signs of recent (methemoglobin) and remote (hemosiderin) hemorrhage are common. Despite it’s apparent demarcation on enhanced scans, the lesion may diffusely infiltrate into the brain, crossing the corpus callosum in 50-75% of cases.
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