| Term | Definition |
|---|
| mAs | Primary controller of x-ray quanitiy |
| Motion, breathing | One advantage of using less time is that it eliminates ______, while increasing time is suitable for _________ techniques |
| double, half | Since mAs is directly proportional to the quantity of x-rays produced (exposure/R), doubling the mAs will ______ the x-ray exposure, while halving the mAs will ____ the x-ray exposure |
| 20-150 kVp | Practical ranges of kilovoltage (kVp) |
| Volt | Unit of pressure which causes electrons to move in current electricity; the higher the amount the faster electrons will move across a conductor (potential difference) |
| 1,000, high, voltage | Kilovoltage: _____ volts; while only a small amount of current - amperage - is needed for x-ray production, ____ levels of _______are needed (20,000-150,000) |
| Quality, quantity | kVp primarily controls _______ of the x-ray beam; secondarily controls the ________ of x-rays |
| Energy, speed | Higher kVp will increase the _____ and _____ of the electrons crossing the x-ray tube from cathode to anode |
| Energy, penetration, quality beam | Higher energy results in x-rays with higher ______, higher ___________, and higher _______ ___ |
| More, quantity of x-rays | Higher speed allows ____ electrons to cross per second, therefore increasing the ________ __ _____ |
| Lower, higher | Changes in kVp will have a greater impact on x-ray emission at _____ kVp ranges than at ______ kVp ranges |
| 2, cm | kVp penetration: increase _ kVp for every __ increase in tissue |
| 40" | Distance at which some magnification of image and detail loss is noted |
| 72" | Distance at which there is negligible magnification of image & detail loss, ideal for chest radiography |
| Teleroentgenograph | An X-ray taken at a distance of 72" with resultant practical parallelism of the rays and production of shadows of natural size |
| Greater, diverges, quantity, area | The closer the x-ray tube, the ______ the intensity of the beam; as x-ray beam leaves target, it ________ in all directions; # of photons unchanged - what changes is ________ in a given ____ |
| mAo/mAn=tn/to | Reciprocity Law formula |
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