"Informally, decibel is a unit of "loudness", which is an informal way of expressing the intensity of sound, which strictly speaking represents the energy it deposits per unit time. This, in turn, is related to the square of the pressure the sound wave physically exerts (in N/m2)."
"Medical ultrasound uses units of intensity of milliwatts per centimetre2 (mW/cm2), but the decibel is a pure number since it is the logarithmic ratio of the two intensities."
"Medical ultrasound uses units of intensity of milliwatts per centimetre2 (mW/cm2), but the decibel is a pure number since it is the logarithmic ratio of the two intensities."
"The "decibel" is technically one tenth of the unit "bel," although the "bel" is rarely used. The bel is named in honour of Scottish-American scientist and inventor of the telephone, Alexander Graham Bell (1847-1927), which is why the 'B' is capitalised in 'dB' 2."
"The "decibel" is technically one tenth of the unit "bel," although the "bel" is rarely used. The bel is named in honour of Scottish-American scientist and inventor of the telephone, Alexander Graham Bell (1847-1927), which is why the 'B' is capitalised in 'dB' 2."
"dB = 10 log10 (I2 / I1)"
"dB = 10 log10 (I2 / I1)"
"...and so on. This is useful in medical ultrasound since the difference in intensity between a transmitted ultrasound beam and a returning echo can be six orders of magnitude different."
Expected headings
"dB = 10 log10 (I2 / I1)"