RF signal | definition of RF signal by Medical dictionary
radio frequency (redirected from RF signal)
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the number of occurrences of a periodic or recurrent process in a unit of time, such as the number of electrical cycles per second measured in hertz
. In cardiac pacing
terminology, frequency is expressed by the formula: frequency = ½ × pulse width.
2. the number of occurrences of a particular event or the number of members of a population or statistical sample falling in a particular class.
the range of frequencies of electromagnetic radiation
between 10 kilohertz and 100 gigahertz, used for radio communication.
relative frequency the ratio of the number of occurrences of a specified phenomenon in a population to the total size of the population.
urinary frequency urination
at short intervals without increase in daily volume of urinary output, due to reduced bladder capacity or cystitis
radio frequency An MRI term for an electromagnetic wave with a frequency in the same range as that used for transmitting radio and television signals. The RF pulses used in MRI are usually in the 1–100 megahertz range, which cause heating of a structure or tissue due to RF pulse absorption.
References in periodicals archive
Because of the low RF signal
attenuation, fiber cables can be cut to standard lengths and connectorized as part of an installation kit.
The threshold level is set by inputting an RF signal
of the desired level into the unit and adjusting the external resistor until the output changes from a logic 0 to a logic 1.
A photodetector array in the focal plane of the lens samples the multiple diffracted beams and produces discrete electronic charge packets whose array position and intensity are proportional to the original RF signal
frequency and power, respectively.