| 释义 |
radiofrequency
ra′di•o•fre`quen•cy or ra′dio fre`quency,
n., pl. -cies. 1. the frequency of the transmitting waves of a given radio message or broadcast. 2. a frequency within the range of radio transmission, from about 15,000 to 1011 hertz. Abbr.: RF, rf [1910–15] Translations
EncyclopediaSeeradio frequencyradiofrequency
radiofrequency [ra″de-o-fre´kwen-se] radio frequency.ra·di·o·fre·quen·cy (rā'dē-o-frē'kwen-sē), 1. Radiant energy of a certain frequency range; for example, radio and television employ radiant energy having a frequency between 105 and 1011 Hz, whereas diagnostic x-rays have a frequency in the range of 3 × 1018 Hz. 2. In magnetic resonance imaging, the energy applied to switch or create a gradient in the magnetic field. ra·di·o·fre·quen·cy (rā'dē-ō-frē'kwĕn-sē) 1. Radiant energy of a certain frequency range; e.g., radio and television employ radiant energy with a frequency between 105-1011 Hz, whereas diagnostic x-rays have a frequency in the range of 3 × 1018 Hz. 2. magnetic resonance imaging The energy applied to switch or create a gradient in the magnetic field. |