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	~~'''~~Opacity~~''' is a property of objects that obstruct light. In the context of [[medicine]], opacity is often used to describe the quality of certain structures in [[radiology]] and [[ophthalmology]].~~		== Opacity ==

	~~== Medicine ==~~		[[File:Opacity Translucency Transparency.svg\|thumb\|right\|Diagram illustrating opacity, translucency, and transparency.]]

	In [[~~radiology~~]], opacity is ~~used~~ to ~~describe structures that appear white on~~ a ~~[[radiograph]]~~. ~~This is because these structures absorb more [[X-ray]]s than the surrounding tissues. Examples of opacities in radiology include [[bone]]~~, ~~[[tumor]]s, and [[pneumonia]]~~.		'''Opacity''' is a measure of the impenetrability to electromagnetic or other kinds of radiation, especially visible light. In the context of [[optics]], opacity describes the degree to which light is not allowed to travel through a material. A completely opaque object does not allow any light to pass through it, while a transparent object allows light to pass through with minimal scattering.

	In [[ophthalmology]], opacity is used to describe any substance that prevents the passage of light into the eye or the transmission of light within the eye. Examples of opacities in ophthalmology include [[cataract]]s, [[corneal ulcer]]s, and [[vitreous hemorrhage]]s.		== Properties ==

	~~== Physics ==~~		Opacity is an important property in various fields such as [[physics]], [[chemistry]], and [[art]]. It is often quantified in terms of the [[absorption coefficient]], which measures how much light is absorbed by a material per unit distance. The higher the absorption coefficient, the more opaque the material is.

	In [[~~physics~~]], opacity is ~~a measure of~~ the ~~impenetrability~~ of ~~electromagnetic~~ or ~~other kinds of radiation by~~ a ~~material. This is often related to the refraction and absorption~~ of the ~~radiation by the material~~.		In [[art]], opacity is used to describe the covering power of a paint or pigment. An opaque paint will cover any underlying colors completely, while a transparent paint will allow some of the underlying colors to show through.

	== ~~See also~~ ==		== Measurement ==

	* [[Transparency and ~~translucency]]~~		Opacity can be measured using various techniques, depending on the type of material and the wavelength of light. In the visible spectrum, opacity is often measured using a [[spectrophotometer]], which can determine the amount of light absorbed by a sample at different wavelengths.
	* [[Absorption (electromagnetic radiation)]]
	* [[~~Scattering~~]]

	[[~~Category~~:Radiology]]		== Applications ==
	[[Category:~~Ophthalmology~~]]
			Opacity has several practical applications:

			* In [[architecture]], materials with different opacities are used to control the amount of natural light entering a building.
			* In [[medicine]], opacity is a key concept in [[radiology]], where it is used to describe the density of tissues in [[X-ray]] images.
			* In [[computer graphics]], opacity is used to create effects such as [[transparency]] and [[translucency]] in digital images.

			== Related Concepts ==

			* [[Transparency]]: The property of allowing light to pass through a material with minimal scattering.
			* [[Translucency]]: The property of allowing light to pass through a material but diffusing it so that objects on the other side are not clearly visible.
			* [[Absorption (electromagnetic radiation)]]: The process by which a material takes in light energy and converts it to other forms of energy.

			== Related Pages ==

			* [[Light]]
			* [[Optics]]
			* [[Radiology]]
			* [[Spectrophotometry]]

			[[Category:Optics]]
	[[Category:Physics]]		[[Category:Physics]]
			[[Category:Materials science]]
	~~{{stub}}~~
	~~{{dictionary-stub1}}~~

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2024-02-24T08:28:56Z

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'''Opacity''' is a property of objects that obstruct light. In the context of [[medicine]], opacity is often used to describe the quality of certain structures in [[radiology]] and [[ophthalmology]].

== Medicine ==

In [[radiology]], opacity is used to describe structures that appear white on a [[radiograph]]. This is because these structures absorb more [[X-ray]]s than the surrounding tissues. Examples of opacities in radiology include [[bone]], [[tumor]]s, and [[pneumonia]].

In [[ophthalmology]], opacity is used to describe any substance that prevents the passage of light into the eye or the transmission of light within the eye. Examples of opacities in ophthalmology include [[cataract]]s, [[corneal ulcer]]s, and [[vitreous hemorrhage]]s.

== Physics ==

In [[physics]], opacity is a measure of the impenetrability of electromagnetic or other kinds of radiation by a material. This is often related to the refraction and absorption of the radiation by the material.

== See also ==

* [[Transparency and translucency]]
* [[Absorption (electromagnetic radiation)]]
* [[Scattering]]

[[Category:Radiology]]
[[Category:Ophthalmology]]
[[Category:Physics]]

{{stub}}
{{dictionary-stub1}}

Opacity - Revision history

Prab: CSV import

Prab: CSV import