Signal-to-noise ratio
Signal-to-noise ratio (pronounced: /ˈsɪɡ.nəl tuː ˈnɔɪz ˈreɪ.ʃoʊ/), often abbreviated as SNR or S/N, is a measure used in science and engineering to quantify how much a signal has been corrupted by noise. It is defined as the ratio of signal power to the noise power, often expressed in decibels.
Etymology
The term "signal-to-noise ratio" originates from the field of electrical engineering, where it was used to measure the quality of signal transmission. The term was later adopted by other scientific and technical fields, including medicine, to describe similar concepts.
Definition
In the context of medical imaging, the signal-to-noise ratio is a key factor in determining the quality of the image. A high SNR indicates a high-quality image with clear details, while a low SNR indicates a poor-quality image with a lot of noise.
Related Terms
- Noise: In the context of signal processing, noise refers to random fluctuations that are added to the signal and can degrade its quality.
- Signal: A signal is a function that conveys information about a phenomenon. In medical imaging, the signal is the data collected from the body that is used to create the image.
- Decibel: A decibel (dB) is a unit of measurement used to express the ratio of one value of a power or field quantity to another, on a logarithmic scale.
- Medical imaging: Medical imaging is the technique and process of creating visual representations of the interior of a body for clinical analysis and medical intervention.
See Also
External links
- Medical encyclopedia article on Signal-to-noise ratio
- Wikipedia's article - Signal-to-noise ratio
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