What causes T2 shine through?
T2 shine through occurs because of long T2 decay time in some normal tissue. This is most often seen with subacute infarctions due to vasogenic oedema but can be seen in other pathologic abnormalities such as an epidermoid cyst. To confirm true restricted diffusion one should always compare the DWI image to the ADC.
What is restricted diffusion?
Restricted diffusion refers to the phenomenon wherein the particle translational diffusion coefficient is reduced, not due to an increase in particle size, but rather due to a reduction in the free space within which the particle can diffuse.
What is liver diffusion?
Principles of Diffusion-weighted Imaging in the Liver. Diffusion is a physical process that results from the thermally driven, random motion of water molecules (13,14). In a container of water, molecules undergo free, thermally agitated diffusion (with a three-dimensional Gaussian distribution).
What does T2 Flair hyperintensity mean?
A hyperintensity or T2 hyperintensity is an area of high intensity on types of magnetic resonance imaging (MRI) scans of the brain of a human or of another mammal that reflect lesions produced largely by demyelination and axonal loss.
What does increased Flair signal mean?
Conclusions. An increase in FLAIR signal intensity of the fluid within the resection cavity of gliomas is a highly specific and early sign for tumor recurrence/tumor progression and can easily be used in the clinical routine.
What is a T2 bright lesion?
White matter hyperintensities (WMHs) are lesions in the brain that show up as areas of increased brightness when visualised by T2-weighted magnetic resonance imaging (MRI). WMH’s are also referred to as Leukoaraiosis and are often found in CT or MRI’s of older patients.
What is T2 flair signal?
T2/FLAIR. T2/FLAIR images show the total amount of scar from MS from its onset. The pictures show both old and new inflammation. T2/FLAIR lesions can directly account for some symptoms. For example, a brainstem lesion can cause room spinning sensations and balance problems.
What is MRI diffusion weighted liver?
Diffusion-weighted (DW)-MRI is a functional imaging technique that is now widely used as a standard imaging sequence, together with unenhanced T1/T2 weighted imaging and contrast-enhanced imaging for liver evaluation.
How common is liver hemangioma?
A liver hemangioma (he-man-jee-O-muh) is a noncancerous (benign) mass in the liver made up of a tangle of blood vessels. Also known as hepatic hemangiomas or cavernous hemangiomas, these liver masses are common and are estimated to occur in up to 20% of the population.
What does T2 FLAIR mean on MRI?
What is bright on T2 MRI?
On a T2-weighted scan compartments filled with water (such as CSF compartments) appear bright and tissues with high fat content (such as white matter) appear dark.
Does T2 FLAIR mean MS?
In other words, T2 and FLAIR sequences help show the overall number of MS lesions in the brain or spinal cord (“MS lesion burden”), T1 sequences show any old areas of atrophy (“black holes”), and contrast-enhanced sequences show any new and active MS lesions (“enhancing lesions”).
What does T2 FLAIR on MRI mean?
Is DWI T1 or T2?
When we say “DWI” we usually are referring to what is in better terms an isotropic T2 weighted map as it represents the combination of actual diffusion values and T2 signal. It is a relatively low resolution image with the following appearance: grey matter: intermediate signal intensity (grey)
What is a hemangioma on the head?
A hemangioma (he-man-jee-O-muh) is a bright red birthmark that shows up at birth or in the first or second week of life. It looks like a rubbery bump and is made up of extra blood vessels in the skin. A hemangioma can occur anywhere on the body, but most commonly appears on the face, scalp, chest or back.