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Radiographic Terms
Terms to know for Imaging
| Term | Definition |
|---|---|
| milliampere (mA) | a measure of electron current to the filament in the X-ray tube. Affects #s of X-rays produced |
| Exposure Time | amount of time that X-rays are permitted to leave the X-ray tube |
| milliamperage / second | # of X-rays produced over a given time |
| Kilovoltage Peak (kVp) | the max kinetic energy of electrons at a given machine setting; controls the penetrating power (energy) of X-rays |
| Radiographic Density | degree of blackness of a radiograph |
| Radiographic Contrast | amount of color difference between light & dark areas on the radiograph |
| Radiographic Detail | definition of the edge of a structure on a radiograph |
| Distortion | abnormal shape of a structure on a radiograph caused by its non-parallel placement to the film/image receptor |
| Collimator | A restricting device used to control the size of the primary beam |
| Grid | a device placed between the patient and the film/image receptor. Absorbs non-image forming radiation |
| Bucky | film placed underneath table, so the grid is used |
| Non-Bucky | film placed on top of table. Used with smaller patients/thinner body parts. Grid is not utilized. |
| Source-Image Distance(SID) / Focal-Film Distance (FFD) | distance between source of X-rays and film/image receptor |
| Caliper | device used to measure thickness (in cm) of what you’re imaging |
| Inverse Square Law | intensity of radiation varies inversely as the square of the distance from the source |
| Santes Rule | Uses the thickness of the area of interest to be radiographed to calculate the KVP needed For patients < 10 cm ---- (2 x thickness)+40 = kVp For patients > 10 cm ---- (2 x thickness)+55 = kVp |
| Scatter Radiation | non-image forming radiation that reflects off subject in all directions |
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Theo_P_15
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