| Term | Definition |
|---|
| Primary beam | Needs to penetrate the body in order to produce an image |
| Size and composition | The amount of x-rays in the beam and the penetrating energy of the beam must be adjusted based on these factors of a body part |
| Prime factors | Enables us to control the quantity (amount) and quality (energy) of the x-ray beam |
| Milliamperage, exposure time, kilovoltage, SID | The prime factors of technique |
| 10-1200 | Ranges for milliamperage (mA) |
| Milliamperage | Measurement of x-ray tube current |
| Ampere | Quantitative term indicating the number of electrons (current) passing a given point in a circuit in a period of one second |
| 6.3 x 10^18 electrons/sec | Mathematical expression for an ampere |
| Milliampere | 1/1,000 of an ampere; in the generation of x-radiation for medical radiography only a small amount of current is necessary |
| mA | Measurement of the number of electrons crossing the tube from cathode to anoder per second |
| Space charge | The cloud of electrons formed around the filament as a result of a boiling off from thermionic emmision |
| Directly | mA is ________ proportional to the tube current (number of electrons crossing the gap), as well as the number of x-rays created |
| Focal spot | mA selection controls which filament, or _____ ____ is used; > 200 mA, lg. filament, < 200 mA, sm. filament |
| .001-10 seconds | Ranges for exposure time |
| Exposure time | Limits or controls length of x-ray exposure; measured in seconds |
| Directly | Exposure time is ________ proportional to the # of electrons crossing the tube as well as the number of x-rays created |
| Number of electrons, how long, mAs | The total # of x-rays created at the target is a product of the ______ __ _________ crossing the tube (mA) and ___ ____ electrons are allowed to cross; this combination is expressed as ___ |
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