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Image Quality
kVp, mAs, Exposure Factors,Noise
| Question | Answer |
|---|---|
| Contols penetrating energy and quality | kVp |
| Primary control of x-ray quantity | mA |
| Duration of exposure is contolled by | time(ms) |
| 4 quality image factors | Density, Contrast, Resolution and Distortion |
| by ____________ the mAs will double the quantity/duration of x rays emitted and thus doubling the density on the film | doubling |
| effects the density according to the inverse square law | SID |
| to make a VISIBLE change to a film that is under or over exposed mAs must be changed by | 30% |
| too little density means the image is | underexposed |
| too much density means the image is | overexposed |
| intensity of radiation omitted is stonger on the cathode and anode end | cathode |
| because of the angle there is greated attenuation/absorption of x rays on the the anode or cathode end | anode |
| Why are compensating filters used? | anatomic parts will attenuate the beam differently |
| What do compensating filters do? | provide overall even density |
| Types of compensation filters; | wedge, trough and boomerang |
| High contrast has a short or long scale and a high or low kVp | short,low |
| Low contrast has a short or long scale and a high or low kVp | long, high |
| acceptance of a range of exposure factors to produce an acceptable image is called | wide latitude or dynamic range |
| Brightness is the same as... | density |
| Recorded sharpness or detail is called | resolution |
| adjusting image contrast and brightness | windowing |
| brightness values of adjacent pixels can be brought closer together | smoother |
| background anatomy can be removed | subtraction |
| text may be added to images is called | annotation |
| misrepresentation of object | distortion |
| numeric value that represents the exposure the IR received | Exposure index |
| disturbance that obsurces reduces clarity can appear grainy or mottled | noise |
| When do you use a grid? | body part is more than 10cm |
| What does ALARA stand for? | As Low As Reasonably Achievable |
| Measures radiation exposure in air | Roentgen |
| Measures patient dose | Rad |
| radiation protection is measured in | Rem |
| dose limiting recommendation for occupationally exposed workers | 5 rem |
| effective dose for the general public is | .1rem per year for frequent exposure and .5 rem per year for infrequent exposure |
| effective dose for younger than 18 | .5 rem |
| effective does for pregnant techs | .05 during any 1 month.5 for gestation period |
| how thick is a lean apron suppose to be | .5mm thick |
Created by:
chocokitty
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