What do you mean by a penumbra?
1a : a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light. b : a shaded region surrounding the dark central portion of a sunspot.
What is an example of penumbra?
An example of the penumbra is the outer lighted area surrounding the shadow of the moon which is created during an eclipse. A partial shadow between regions of full shadow (the umbra) and full illumination, especially as cast by Earth, the Moon, or another body during an eclipse.
What part of speech is penumbra?
noun
noun, plural pe·num·brae [pi-nuhm-bree], pe·num·bras.
What is penumbra in radiography?
[pĕ-num´brah] 1. the part of a shadow in which there is a small amount of illumination from a light source. 2. blurring at the edges of a structure on a radiograph.
What is the penumbra medical?
In pathology and anatomy the penumbra is the area surrounding an ischemic event such as thrombotic or embolic stroke. Immediately following the event, blood flow and therefore oxygen transport is reduced locally, leading to hypoxia of the cells near the location of the original insult.
What is a penumbra in the brain?
What is a synonym for penumbra?
Penumbra synonyms In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for penumbra, like: shade, shadow, umbra, penumbral, umbrage, umbral and light.
What is penumbra in CT?
CT perfusion A fairly common definition for penumbra is the area of brain with 1,2: prolonged (increased) T-max, typically >6 seconds (or other measures of delayed arrival of contrast such as mean transit time (MTT) or time to peak (TTP)), and… normal or increased cerebral blood volume (CBV) due to autoregulation.
What is geometric penumbra?
The region, near the edge of a radiation beam, where the dose changes rapidly according to the distance from the beam axis is known as the penumbra. Transmission penumbra is the region irradiated. by photons which have traversed a part of a col- limator. Geometric penumbra is the region irradiat-
What is penumbra in neurology?
What are complications of tPA?
Complications related to intravenous r-tPA include symptomatic intracranial hemorrhage, major systemic hemorrhage, and angioedema in approximately 6%, 2%, and 5% of patients, respectively.
What causes an embolic stroke?
Embolic strokes are usually caused by a blood clot that forms elsewhere in the body (embolus) and travels through the bloodstream to the brain. Embolic strokes often result from heart disease or heart surgery and occur rapidly and without any warning signs.
Which is the best synonym for the word conundrum?
the conundrum of how an ancient people were able to build such massive structures without the benefit of today’s knowledge and technology. Synonyms for conundrum. closed book, enigma, head-scratcher, mystery, mystification, puzzle, puzzlement,
Which is the best definition of the word Penumbra?
Definition of penumbra. 2 : a surrounding or adjoining region in which something exists in a lesser degree : fringe the seventeenth century lay in the penumbra of the middle ages — Edward Eggleston 3 : a body of rights held to be guaranteed by implication in a civil constitution…
What is a conundrum for a working parent?
Arranging childcare over the school vacation can be a real conundrum for working parents. Want to learn more? Improve your vocabulary with English Vocabulary in Use from Cambridge. Learn the words you need to communicate with confidence.
Who is the penumbra of the # MeToo movement?
— Miriam Fauzia, USA TODAY, 26 May 2021 Juliet Williams, a professor of gender studies at UCLA, says Spears’ speech can be understood as a penumbra of the #MeToo movement. — Alia E. Dastagir, USA TODAY, 25 June 2021
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