By Robert A. Fosbinder BA RT(R), Denise Orth MS RT (R)(M)
Lippincott Williams & Wilkins is proud to introduce necessities of Radiologic technological know-how, a middle, complete textbook for radiologic know-how scholars. targeting the an important parts and minimizing extraneous content material, this article is going to aid organize scholars for fulfillment at the American Registry of Radiologic Technologists exam in Radiography and past into perform. issues lined comprise radiation safeguard, apparatus operation and quality controls, photo creation and review, and sufferer care. it is a key and an important source for radiologic expertise courses, targeting the main proper details and supplying instruments and assets to scholars of a number of studying varieties. those contain a whole suite of ancillary items, various pedagogical positive aspects embedded within the textual content, and a powerful specialise in the sensible software of the suggestions offered.
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Extra resources for Essentials of Radiologic Science
One megahertz (MHz) is equal to one million (106) Hz or cycles per second. Period The period of a wave is the time required for one complete cycle. 3. The relationship between frequency and period of a waveform. per second has a period of one-half second; that is, one complete wave cycle occurs each half second. 3 illustrates the relationship between frequency and period (time) in a sine wave. Wavelength The distance between adjacent peaks or adjacent valleys of a wave is the wavelength and is represented by lambda (l).
4 illustrates the relation between wavelength and frequency. Electromagnetic wave velocity, frequency, and wavelength are related and a change in one factor causes a change in one or both of the other factors. The wave is demonstrated with this formula: c= fl where c (velocity) is the speed of light (3 × 108 m/s, in air), f is the frequency, and lambda (l) is the wavelength. Note that the product of frequency and wavelength must always equal the velocity. Thus, frequency and wavelength are inversely proportional.
TYPICAL CURRENTS ASSOCIATED WITH THE FILAMENT AND X-RAY TUBE Location Current X-ray filament X-ray tube 2–5 A 50–800 mA Unit of Current An electric current is a flow of electrons over a set amount of time. The ampere (A) is the unit of current and is defined as one coulomb of electric charge flowing per second (1 A = 1 C/1 s). The milliampere (mA) is a smaller unit of current; it is equal to 1/1,000 of an ampere (10−3 A). Diagnostic radiographic equipment uses a variety of mA units to regulate the number of electrons needed to produce x-ray photons.