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Quality Assurance
Radiography for Veterinary Technicians
| Question | Answer |
|---|---|
| What is kilovoltage responsible for? | the penetrating power of the beam- controls the quality of the image- associated with contrast of image |
| What is milliamperage responsible for? | controls the quantity of electrons- # of electrons released from machine- associated with density |
| What is contrast on a radiographic image mostly dependent on? | An increase or decrease in milliamperage and time |
| Kilovoltage affects the image primarily in the range of what? | Contrast |
| Which correction must be made if the film is too dark and it is not over-penetrated? | Decrease mAs 30%–50% |
| Which correction must be made if the film is too light and it is under-penetrated? | Increase kVp 10%–15% |
| When taking radiographs of the extremities, the contrast should be what? | High contrast |
| A veterinary technician notes that a film is too dark and there is minimal contrast because everything appears gray. What is the most appropriate adjustment to make to improve the quality of the repeat film? | Decrease kVp |
| When altering mAs or kVp settings to improve a radiograph, what guidelines regarding incremental changes are appropriate when making adjustments? | kVp should be changed 10% to 15%, and mAs should be changed 30% to 50% |
| Which of the following absorbs the most X-rays? Fat, metal, air, or bone? | Metal |
| Which of the following is the best example of contrast from least to most dense? | Gas, fat, fluid, bone, metal |
| What does quality assurance refer to? | regular maintenance and annual evaluation of x-ray machine |
| What should completed radiographs be evaluated for? | detail, density, and scale of contrast |
| Define image detail | degree of sharpness & is affected by FFD & distance from patient to film |
| Define density | degree of blackness and most affected by mAs |
| What is contrast? | opacity or density difference between 2 structures & is most affected by kVp-- shades of grey |
| What do technique charts determine? | ideal settings of kVp, mAs, and time for body parts |
| Sante's rule states what? | that kVp should be approximately 40 plus twice the measurement in centimeters |
| Why is it important in veterinary radiology to keep the mA setting as high as possible? | When the mA is kept as high as possible, the time can be as low as possible. The #1 artifact in veterinary radiology is motion from a moving animal. Shorter exposure times decrease radiation exposure to any personnel who are restraining the animal. |
| What happens when the x-ray tube is moved closer to the table than the technique chart is designed for? | When the x-ray tube is moved closer to the film and the same amount of radiation is used, the film will come out too dark. |
Created by:
BrianaPenn
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