Radiology Chapter 4
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Created by:
VaniaNixon on June 26, 2012
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Exposure Factors
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22 terms
Terms | Definitions |
|---|---|
 Caliper | a device used to measure the thickness of anatomic parts |
| Contrast | the measurable difference between two adjacent densities |
| Density | the degree of blackness on a radiograph |
| Exposure Time | the period of time during which x-rays are permitted to leave the x-ray tube |
| Inverse Square Law | the intensity of the radiation varies inversely as the square of the distance from the source |
| Kilovoltage | related to thousands of volts. Describes the electrical potential (differences) between the cathode and the anode; it is responsible for accelerating the electrons from the cathode to the anode and relates to the penetrating power the x-rays. |
| Kinetic energy | the energy related to motion |
| Milliamperage-seconds (mAs) | the number of x-rays produced over a given period. Calculated by multiplying the milliamperage by the time |
| Milliampere | one thousandth of an ampere. A measure of electron current to the filament, which has a direct relationship to the number of x-rays produced. |
| Sante's rule | a method of estimating kilovoltage in relation to area thickness (2x thickness) +40 = kVp |
| Source-image distance (SID) | formerly called focal-film distance (FFD) the distance between the source of x-rays and the image receptor or film |
| Thermionic emmission | the process of releasing electrons from their anatomic orbits by heat |
| ways to decrease the number of personnel in the radiology suite include | sedating patients |
| ways to increase penetrating power of x-rays include | increasing kVp |
| the milliamperage-seconds (mAs) for 1000 mA and 1/10 sec is | 100 mAs |
| According to Sante's rule, if a cat's abdomen measures 12cm, kVp is | 64 |
| The source-image distance | must be considered each time the control panel is set |
| one percent of the energy produced at the anode is in the form of | x-rays |
| The temperature of the filament within the cathode is controlled by | mA setting |
| Which is a characteristic of x-rays | their intensity increases as SID decreases |
| The potential difference between the anode and cathode is measured in | kilovolts |
| A higher kVp setting allows for a ________ mAs and ______exposure time | lower, lower |
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