Ch. 29
Help!
|
|
||||
|---|---|---|---|---|---|
| show | contrast
🗑
|
||||
| The term ___________ describes the concept of contrast as it is displayed on a soft-copy monitor for digital images. | show 🗑
|
||||
| The term __________ accurately describes the digital processing that produces changes in the range of density/brightness. | show 🗑
|
||||
| Any change in overall ____ will affect contrast. | show 🗑
|
||||
| _____ contrast provides more diagnostic information, if it is still in visible range. | show 🗑
|
||||
| show | Few shades of gray
Increased contrast
Low kVp
Short scale contrast
Short dynamic range/window width
🗑
|
||||
| show | Many shades of gray
Decreased contrast
High kVp
Long scale contrast
Large dynamic range/window width
🗑
|
||||
| show | Scale of contrast
🗑
|
||||
| show | Physical contrast
🗑
|
||||
| show | Visible contrast
🗑
|
||||
| show | change in the film's Dlog E curve, adjustments in kVp or by the use of window width.
🗑
|
||||
| ___________ is the range of densities that the film is capable of recording. | show 🗑
|
||||
| show | intensifying screens
film density
D log E curve
Processing
🗑
|
||||
| Intensifying screens create an inherently _________ image. | show 🗑
|
||||
| Film contrast also changes with changes in ______. | show 🗑
|
||||
| show | decrease
🗑
|
||||
| show | straight line portion
🗑
|
||||
| As the slope of the curve becomes steeper, contrast is _______. | show 🗑
|
||||
| Increased developer temperature, time, and replenishment cause increased fog and _________. | show 🗑
|
||||
| show | subject contrast
🗑
|
||||
| ______ is the primary controller of subject contrast. | show 🗑
|
||||
| An increase in kVp will lead to a wider range of exposures on the IR, which results in an overall _____ contrast. | show 🗑
|
||||
| show | high
🗑
|
||||
| show | compressed; expanded
🗑
|
||||
| show | Compton interactions
🗑
|
||||
| show | decreased
🗑
|
||||
| show | heat
low level ionizing radiation
chemical fumes
🗑
|
||||
| show | decrease
🗑
|
||||
| When the difference between adjacent thicknesses is great, subject contrast is ______; when little difference exists in the thickness of adjacent body parts, subject contrast is _____. | show 🗑
|
||||
| show | increased; decreased
🗑
|
||||
| A decrease in overall body part thickness/field size = _______ subject contrast | show 🗑
|
||||
| Materials with a higher Z# absorbs a _______% of the x-ray beam than low Z# materials. | show 🗑
|
||||
| The presence of more electrons will enable _____ interactions to occur. | show 🗑
|
||||
| show | increased
🗑
|
||||
| Contrast media _______ subject contrast by introducing greater differences in Z# variations than those that exist naturally. | show 🗑
|
||||
| show | increased
🗑
|
||||
| show | densities
🗑
|
||||
| A _______ is tool to help focus on the contrast in a certain area. | show 🗑
|
||||
| A visible change in contrast will not be perceived until kVp is changed by _______ | show 🗑
|
||||
| show | 4-5%
🗑
|
||||
| show | 15 or 8
🗑
|
||||
| Contrast evaluation can be made only when sufficient ______ exists to permit the range of contrast to be seen. | show 🗑
|
||||
| Photoelectric effect interactions ______ as kVp decreases. | show 🗑
|
||||
| show | lower
🗑
|
||||
| kVp affects contrast and has the most _____ effect on the image. | show 🗑
|
||||
| Influencing factors has a ______ effect on the image. | show 🗑
|
||||
| show | kVp
🗑
|
||||
| As kVp increases, contrast _____. (and vice versa) | show 🗑
|
||||
| kVp increases amount of radiation fog, which will in result _____ contrast. | show 🗑
|
||||
| show | decreased
🗑
|
||||
| show | none
🗑
|
||||
| show | increase
🗑
|
||||
| show | decrease
🗑
|
||||
| show | increase
🗑
|
||||
| show | decrease
🗑
|
||||
| High Z#'s will cause more photoelectric absorption, resulting in _______ contrast. | show 🗑
|
||||
| Grids improve _____ by removing scatter before it reaches the IR. | show 🗑
|
||||
| Higher ratio grids remove more scatter - and will result in a ____ contrast image. | show 🗑
|
||||
| show | Bit depth
🗑
|
||||
| The larger the bit depth the ____ shades of gray the can be recorded. | show 🗑
|
||||
| show | decrease
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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
Created by:
teachable monkeys
Popular Radiology sets