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What (who) is quadratic contrast - definition

SUBSTANCE USED IN MEDICAL IMAGING TO ENHANCE THE CONTRAST OF STRUCTURES OR FLUIDS WITHIN THE BODY

Contrast media; Contrast Medium; Contrast agents; Contrast substance; Contrast material; Intravenous contrast; Contrast enhancement; Contrast medium

Contrast agent

A contrast agent (or contrast medium) is a substance used to increase the contrast of structures or fluids within the body in medical imaging. Contrast agents absorb or alter external electromagnetism or ultrasound, which is different from radiopharmaceuticals, which emit radiation themselves.

https://en.wikipedia.org/wiki/Contrast_agent

contrast medium

¦ noun Medicine a substance introduced into a part of the body in order to improve the visibility of internal structures during radiography.

Quadratic irrational number

MATHEMATICAL CONCEPT

Quadratic surd; Quadratic irrationality; Quadratic Irrational Number; Quadratic irrationalities; Quadratic irrational; Quadratic irrational numbers

In mathematics, a quadratic irrational number (also known as a quadratic irrational, a quadratic irrationality or quadratic surd) is an irrational number that is the solution to some quadratic equation with rational coefficients which is irreducible over the rational numbers.Jörn Steuding, Diophantine Analysis, (2005), Chapman & Hall, p.

https://en.wikipedia.org/wiki/Quadratic_irrational_number

Wikipedia

Contrast agent

A contrast agent (or contrast medium) is a substance used to increase the contrast of structures or fluids within the body in medical imaging. Contrast agents absorb or alter external electromagnetism or ultrasound, which is different from radiopharmaceuticals, which emit radiation themselves. In x-ray imaging, contrast agents enhance the radiodensity in a target tissue or structure. In magnetic resonance imaging, contrast agents shorten (or in some instances increase) the relaxation times of nuclei within body tissues in order to alter the contrast in the image.

Contrast agents are commonly used to improve the visibility of blood vessels and the gastrointestinal tract.

The types of contrast agent are classified according their intended imaging modalities.

https://en.wikipedia.org/wiki/Contrast agent