Term
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Definition
| phototimer and ionization chamber |
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Term
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Definition
| Automatic Exposure Control System |
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Term
| What are 2 types of technique charts |
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Definition
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Term
| Why is fixed kVp technique chart used more |
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Definition
| most control of contrast levels |
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Term
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Definition
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Term
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Definition
| fuzziness or blurriness of the outline of the image |
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Term
| 3 major classes of detail |
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Definition
| Motion, Material, Geometric |
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Term
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Definition
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Term
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Definition
| Voluntary, involuntary and accidental |
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Term
| 3 types of material factors |
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Definition
| Film, screen and good film/screen contact |
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Term
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Definition
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Term
| What causes size distortion aka magnification |
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Definition
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Term
| What causes shape distortion |
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Definition
| Tube angulation and body angulation when unecessary |
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Term
| Do you get elongation or foreshortening with tube angulation |
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Definition
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Term
| What do you get with body angulation elongation or foreshortening |
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Definition
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Term
| If it is impossible to position a part close the film what has to be increased |
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Definition
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Term
| In order to produce a radiograph having the best detail a technician should use what type of screen speed |
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Definition
| Slow CaWo4 (calcium tungstate) |
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Term
| If the part to be radio-graphed is positioned so that it is not parallel to the film it will be |
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Definition
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Term
| The value of a small focal spot is that it helps to provide |
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Definition
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Term
| Short exposures and immobilization of the body part are used to control |
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Definition
| involuntary motion and sharpness |
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Term
| what has the worst affect on detail |
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Definition
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Term
| Radio-graphic detail refers to |
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Definition
|
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Term
| misrepresentation of the true size or shape of an object is called |
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Definition
|
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Term
| high speed intensifying screens allow for a short xposure time but sacrifice |
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Definition
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Term
| To reduce motion a technician can |
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Definition
| communicate to the pt, use sand bags to immobilize pt and use short exposure time |
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Term
| what is the major cause of increased magnification |
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Definition
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Term
| Warped cassettes, worn felt in cassettes, or damaged latches cold be the cause of |
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Definition
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Term
| Grid radius effects recorded detail: true or false |
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Definition
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Term
| Plastic or aluminum wedge filters are examples of |
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Definition
| compensating filters to provide uniform density |
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Term
| what % of time a technician must make changes in the technical factors |
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Definition
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Term
| What is the purpose of a compensating filter |
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Definition
| to provide uniform density |
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Term
| What causes the most repeated radiographs in a radiology department |
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Definition
| over exposure and under exposure |
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Term
|
Definition
| tool used to measure pt part thickness |
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Term
| According to the xray syllabus on radiation protection the head of the patient should be at the anode size for |
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Definition
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Term
| what screen speed and fss results in the best radiographic detail |
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Definition
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Term
| a properly designed technique chart should be based on |
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Definition
|
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Term
| true or false penumbra is distortion |
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Definition
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Term
| Def: stretching of anatomy |
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Definition
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Term
| def: misrepresentations of true size and shape of anatomy on film |
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Definition
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Term
| def: main controlling factor of density |
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Definition
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Term
| def: clarity and sharpness of anatomy on a radiograph |
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Definition
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Term
| unsharpness around the true image |
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Definition
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Term
|
Definition
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|
Term
| size distortion is known as |
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Definition
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|
Term
| main controlling factor of magnification |
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Definition
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Term
| main controlling factor of contrast |
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Definition
|
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Term
| describe what is meant by poor film screen contact |
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Definition
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Term
| poor film screen contact causes what artifacts |
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Definition
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Term
| the central ray is not directed to the center of the film what kind of distortion would u get |
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Definition
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Term
| Recorded detail can be measured and is expressed as: |
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Definition
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Term
| A resolution pattern will do what: |
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Definition
| measure and record line pairs per mm |
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Term
| what is recorded detail defined as |
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Definition
| accuracy of structural lines recorded |
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Term
| the relationship between focal spot size and distance results in |
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Definition
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Term
|
Definition
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Term
|
Definition
| increased recorded detail |
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Term
| the ability of the imaging system to distinguish between 2 adjacent structures defines |
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Definition
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Term
| what is the equation for making your own chart |
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Definition
| body in CM x 2 + 30 and has to be over 44 kVp |
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Term
| what 2 conditions must be met before technique charts can be affective? |
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Definition
| xray equip. must be calibrated and image processing must be consistent through department |
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Term
| def:kVp value that is high enough to ensure penetration of the part but not too high to diminish radiographic detail |
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Definition
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Term
| Def: pre-established guidelines used to select standardized exposure factors |
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Definition
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Term
| what is the primary patient factor that determines the selection of exposure factors |
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Definition
|
|
Term
| what is the primary goal of exposure technique charts |
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Definition
| consistently produce quality images |
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Term
| what is an advantage of a fixed kVp technique |
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Definition
|
|
Term
| what is disadvantage of variable kVp technique chart |
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Definition
| increases heat load on xray tube |
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