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Fluid-attenuated inversion recovery (FLAIR) is a magnetic resonance imaging sequence with an inversion recovery set to null fluids. For example, it can be used in brain imaging to suppress cerebrospinal fluid (CSF) effects on the image, so as to bring out the periventricular hyperintense lesions, such as multiple sclerosis (MS) plaques. [ 1 ]
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.
PNETs can also be spotted through computed tomography (CT) and magnetic resonance imaging (MRI). [2] In images produced by MRIs, an irregular augmentation among a solid mass will indicated the presence of tumor. [3] However, the results of MRIs are usually ambiguous in defining the presence for this specific tumor. [2]
Axial T2 FLAIR sequence MR image of a middle-aged man with leukoaraiosis. MRI image: Leukoaraiosis in a 90-year-old patient with cerebral atrophy. Head CT showing periventricular white matter lesions. Leukoaraiosis is a particular abnormal change in appearance of white matter near the lateral ventricles. It is often seen in aged individuals ...
The key to Phase-contrast MRI (PC-MRI) is the use of a bipolar gradient. [4] A bipolar gradient has equal positive and negative magnitudes that are applied for the same time duration. The bipolar gradient in PC-MRI is put in a sequence after RF excitation but before data collection during the echo time of the generic MRI modality.
The initial diagnosis of a tumor is made with a radiographic study (MRI [22] or CT-). If CT was performed first, an MRI is usually performed as the images are often more detailed and may reveal previously undetected metastatic tumors in other locations of the brain. In addition, an MRI of the spine is usually performed. The AT/RT tumor often ...
The incidence (number of cases per year) of PRES is not known, but increasing use of MRI scans has led to increased recognition. [ 1 ] [ 4 ] [ 5 ] The incidence of PRES in certain subgroups has been estimated to be approximately 0.8% in those with end stage renal disease, 0.7% in those with SLE, and 0.5% in those with a solid organ transplant ...
Central pontine myelinolysis; Other names: Osmotic demyelination syndrome, central pontine demyelination: Axial fat-saturated T2-weighted image showing hyperintensity in the pons with sparing of the peripheral fibers, the patient was an alcoholic admitted with a serum Na of 101 treated with hypertonic saline, he was left with quadriparesis, dysarthria, and altered mental status