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Advanced Modalities
Moduel 4
| Question | Answer |
|---|---|
| What would be some factors in an underexposed image? | Decreased kVp Insufficient mAs a relative speed receptor slower than expected less processing time than expected a low developer temp a decreased chemical concerntration |
| - the difference among densities seen in an image | radiographic contrast |
| What is the cause for blurred images? | motion or changes in geometric factor during image production |
| What is the main case for blur in radiographic images? | motion |
| What happens when the computer fails to recongnize an images borders? | an exposure field recongnition error occurs |
| What are the parameters of excessive radiation? | more than 3-4 times the level of radiation needed to produce a diagnostic quality image |
| What is the most likely cause of image blur? | patient movement |
| How is shape distortion caused? | by a change in the angular relationship of the tube, part and image receptor |
| How is quantum noise in digital images caused? | insufficient signal strength |
| Is distortion of photons in the xray beam uniform? | no |
| What do some digital systems use as an indicator of exposure? | DAP dose area product |
| To avoid potential data analysis errors, how many images is recommended per image receptor? | 1 |
| How do artifacts found in cassette-based image receptors differ somewhat from those found in cassette-less receptors? | PSP plate moves in and out of the cassette each time the plate reader processes an image |
| In cassette-less image receptors what is susceptible to malfunction? | a single DEL or multiple rows of DELS |
| What is a major source of digital artifacts in cassette-less radiography? | DELs |
| What is another source of artifacts in a cassette-less radiography? | dust, dirt, bending, and staining |
| Where do processing artifacts appear? | along an entire plate axis and on nearly all images regardless of the plate thats used |
| If image data is loss caused by a dirty light guide, what appears on the processed image? | a line that runs the entire width of the plate and is parallel to the direction the plate traveled through the reader |
| If there is a wavy appearance to the image, what does that mean? | that the laser or the plate was disturbed when the plate was read |
| What error is caused by the computers inability to identify edges of collimation? | |
| Improper alignment of a grid can lead to improper ________. | |
| Scatter radiation is hard to interpret during histogram analysis when it occurs where? | |
| Inappropriate brightness on a digital image can be caused by what? | |
| When the exposure absorbed by the image receptor passes a level which the image receptor can respond, what occurs? | |
| MOst digital artifacts appear ______? |
Created by:
erikasmith28
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