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img crit mid 2
image critique midterm - density and contrast
| Question | Answer |
|---|---|
| With an increase in IR size (decreased collimation), what change must be made to maintain the OD on the film? | decrease in mAs |
| When considering the anode heel effect, what part of the tube should be placed over the lower half of the patient for a T-spine x-ray? | cathode |
| For screen film, what is the primary controller of OD? | mAs |
| In digital radiography, what produces a change in density? | window level |
| What is the minimum change necessary to produce a visible shift in film density? | 30% |
| What is the relationship between anatomical part thickness and density? | indirect – increased part thickness, decreased overall film OD |
| How will increased beam restriction affect density? | decreases it |
| How will increasing the SID during an exam affect density? | decreases it |
| Will changing the FSS affect density if the tube is calibrated correctly? If so, by how much? | it has no effect |
| A destructive pathological condition affects density how? | increases it |
| Decreasing filtration of the x-ray tube affects density how? | increases it |
| Decreasing the time that the film sits in the developer affects density how? | decreases it |
| Increasing the number of pulses in the generator waveform affects density how? | it increases density |
| Increasing the grid ratio does what to density? | decreases it |
| Explain the relationship between generator waveform pulses and density | with more pulses the voltage is more consistent, leading to more photon output, increasing image density. |
| In digital what factor controls contrast on the image? | window width |
| A long scale of contrast could be termed what in DR? | large dynamic range/window width |
| What kind of H&D curve demonstrates the most contrast? | a steep one |
| How will changing to a large FSS affect contrast? | it has no effect on contrast |
| How will increasing the SID affect contrast? | it shortens the scale, or increases contrast |
| How will increasing the OID affect contrast? | it shortens the scale, or increases contras |
| Additive pathology will do what to contrast on the image? | lengthen the scale, decreasing contrast |
| How will decreasing beam restriction affect contrast? | it lengthens the scale, decreasing contrast |
Created by:
annaluz87
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