img crit ch 30 Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
| Question | Answer |
| What is the unit for screen film resolution? | line pairs per mm |
| How is resolution determined with line pairs for screen film? | more line pairs means better resolution |
| Term for recorded detail in digital imaging? | spatial resolution |
| What determines spatial resolution? | matrix size, pixel size, gray scale, bit depth |
| What is the Z-axis? | gray scale, represents depth to the information in the image (bit depth) |
| X and Y grid matrix | make up the spatial resolution because they represent points in space |
| High frequency is what kind of wavelength? | short wavelength |
| Define gray scale as relating to spatial resolution | the number of shades of gray that can be displayed by each pixel |
| High spatial resolution correlates with _____ object size? | small |
| High spatial resolution correlates with _____ OID? | small (close) |
| High spatial resolution correlates with _____ unit of measure? | high Lp/mm |
| High spatial resolution correlates with _____ MTF? | high |
| High spatial resolution correlates with _____ PSF? | low |
| Low spatial resolution correlates with _____ object size? | large |
| Low spatial resolution correlates with _____ OID? | large (distant) |
| Low spatial resolution correlates with _____ unit of measure? | low Lp/mm |
| Low spatial resolution correlates with _____ MTF? | low |
| Low spatial resolution correlates with _____ PSF? | high |
| Nyquest criterion | samples the spatial resolution 2X per cycle and averages incoming data to insure no info is missed, overlapped or doubled. |
| Aliasing | incoming data is samples less than 2X per cycle, images have more pattern |
| What factors affect recorded detail? | FSS, OID, SID, IR, CR imaging plates, size of detector, image processing system, motion |
| Increasing the SID affects recorded detail how? | increases |
| Decreasing OID affects recorded detail how? | increases |
| Increasing patient thickness affects recorded detail how? | decreases |
| Decreasing FSS affects recorded detail how? | increases |
Created by:
annaluz87
Popular Radiology sets