Brightness
Brightness
Brightness (/ˈbraɪtnəs/) is a term used in various fields, including optics, photography, and medicine, to describe the perceived intensity of light emitted, reflected, or transmitted from a source.
Etymology
The term "brightness" originates from the Old English word "beorhtnes," which means "brightness, splendor, clearness."
In Medicine
In the field of medicine, brightness is often used in the context of medical imaging, particularly in radiology and ultrasound imaging. It refers to the relative lightness or darkness of a pixel or a region in an image, which can provide important diagnostic information.
For example, in an ultrasound scan, the brightness of the image can indicate the density of the tissue being scanned. Areas that appear bright, or hyperechoic, often represent denser tissues such as bone or areas of calcification, while darker, or hypoechoic, areas often represent less dense tissues or fluid-filled structures.
Related Terms
- Contrast: In visual perception, contrast is the difference in brightness between objects or regions.
- Luminance: A photometric measure of the luminous intensity per unit area of light travelling in a given direction.
- Radiodensity: The property of an object that determines the amount of radiation that it will absorb, relative to the amount of radiation absorbed by other objects.
- Hyperechoic: Refers to a region in an ultrasound image where the echoes are brighter than normal or are brighter than the surrounding structures.
- Hypoechoic: Refers to a region in an ultrasound image where the echoes are not as bright as normal or are less bright than the surrounding structures.
External links
- Medical encyclopedia article on Brightness
- Wikipedia's article - Brightness
This WikiMD dictionary article is a stub. You can help make it a full article.
Languages: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
Urdu,
বাংলা,
తెలుగు,
தமிழ்,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
European
español,
Deutsch,
français,
русский,
português do Brasil,
Italian,
polski