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Radiolucency or hypodensity indicates greater passage (greater transradiancy) to X-ray photons [1] and is the analogue of transparency and translucency with visible light. Materials that inhibit the passage of electromagnetic radiation are called radiodense or radiopaque , while those that allow radiation to pass more freely are referred to as ...
The external capsule is a series of white matter fiber tracts in the brain.These fibers run between the most lateral (toward the side of the head) segment of the lentiform nucleus (more specifically the putamen) and the claustrum.
Ischaemic leukoaraiosis has been defined as the leukoaraiosis present after a stroke. [12]Diabetes-associated leukoaraiosis has been reported [13]; CuRRL syndrome: increased Cup: Disc Ratio, Retinal GanglionCell Complex thinning, Radial Peripapillary Capillary Network Density Reduction and Leukoaraiosis [2]
Definition [ edit ] The Hounsfield unit (HU) scale is a linear transformation of the original linear attenuation coefficient measurement into one in which the radiodensity of distilled water at standard pressure and temperature ( STP ) is defined as 0 Hounsfield units (HU), while the radiodensity of air at STP is defined as −1000 HU.
Identification of the dense artery sign is often based on subjective interpretation and false positives may occur. One study aiming to define criteria for the sign determined that measuring Hounsfield units on the CT scan could differentiate between the dense MCA sign associated with ischemic stroke and that caused by false positives. [8]
The ''left lobe'' is smaller and more flattened than the right. It is situated in the epigastric, and left hypochondriac regions of the abdomen.Its upper surface is slightly convex and is moulded on to the diaphragm; its under surface presents the gastric impression and omental tuberosity.
A ring-enhancing lesion is an abnormal radiologic sign on MRI or CT scans obtained using radiocontrast.On the image, there is an area of decreased density (see radiodensity) surrounded by a bright rim from concentration of the enhancing contrast dye.
One of the most basic roles of the perivascular space is the regulation of fluid movement in the central nervous system and its drainage. [13] The spaces ultimately drain fluid from neuronal cell bodies to the cervical lymph nodes. [5]