x-posure/scatter/scatter
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| remnant x-rays are those that? | show 🗑
|
||||
| what factor(s) that affects scatter radiation can be controlled by the technologist? | show 🗑
|
||||
| show | increases b/c there is less compton interaction
🗑
|
||||
| show | 1%
🗑
|
||||
| at a high kVp (125kVp), most x-rays are? TRANSMITTED THRU THE BODY WITH INTERACTION or TRANSMITTED THRU THE BODY WITHOUT INTERACTION | show 🗑
|
||||
| increasing kVp while decreasing mAs decreases what? | show 🗑
|
||||
| if a constant optical density is maintained while kVp in increased what happens to patient dose? | show 🗑
|
||||
| as field size increases, what happens to scatter? | show 🗑
|
||||
| scatter radiation reduces radiographic quality by changing? CONTRAST, DISTORTION, OPTICAL DENSITY, MASS DENSITY | show 🗑
|
||||
| x-rays that the tech would like to have interact with the IR are those that are? | show 🗑
|
||||
| an increase of kVp from 70 to 80? RESOLUTION IMPROVED, SID MUST BE INCREASED, HIGHER PROPORTION OF SCATTER, LOWER PROPORTION OF SCATTER | show 🗑
|
||||
| an increase in kVp from 70 to 90, while other factors remain constant result in? INCREASED DETAIL, DECREASED # OF ABSORBED RAYS, INCREASED # OF ABSORBED RAYS | show 🗑
|
||||
| what increases as the field size of the beam increases? QUANTUM MOTTLE, SCATTER, MAGNIFICATION | show 🗑
|
||||
| show | kVp
🗑
|
||||
| which process is most responsible for the production of scatter? PHOTOELECTRIC EFFECT, COMPTON EFFECT, TRANSMISSION | show 🗑
|
||||
| show | added filtration
🗑
|
||||
| an aperture diaphragm allows x-rays to expose an area? | show 🗑
|
||||
| when an aperture diaphragm is used cutoff can occur when? | show 🗑
|
||||
| show | aperture diaphragm
🗑
|
||||
| show | projectile electrons do not strike the focal spot
🗑
|
||||
| show | scatter
🗑
|
||||
| a decrease in field size will result in? | show 🗑
|
||||
| factors that influence scatter in image forming beam? | show 🗑
|
||||
| show | false
🗑
|
||||
| show | control scatter
🗑
|
||||
| principle reason for using a grid? | show 🗑
|
||||
| which material is the most radiolucent? ALUMINUM, CARBON FIBER, COPPER, LEAD | show 🗑
|
||||
| what is the most important grid characteristic? | show 🗑
|
||||
| show | very low
🗑
|
||||
| grids are principally effective in attenuating which of the following? photoelectrons, remnant radiation, x-rays after compton interaction, x-rays after photelectric interactions | show 🗑
|
||||
| show | make the grid thicker
🗑
|
||||
| as grid frequency increases what happens with the grid strips? | show 🗑
|
||||
| use of which will reduce radiographic contrast? COLLIMATORS, FILTRATION, GRIDS, INTENSIFYING SCREENS | show 🗑
|
||||
| which is the best grid material in terms of x-ray attenuation? COPPER, IODINE, TUNGSTEN, URANIUM | show 🗑
|
||||
| show | added filtration
🗑
|
||||
| which are more effective, high grid ratios or low grid ratios? | show 🗑
|
||||
| efficiency of a grid to reduce scatter is related to? GRID FREQUENCY, GRID INTERSPACE, GRID RATIO | show 🗑
|
||||
| which is the least important indicator of grid performance? GIRD FREQUENCY, GRID MASS, GRID STRIP HEIGHT, GRID RATIO | show 🗑
|
||||
| show | with a grid compared to that obtained without a grid
🗑
|
||||
| in general, the selectivity of a grid depends on which? CONTRAST IMPROVEMENT FACTOR, FOCAL LENGTH, GRID FREQUENCY, GRID MASS, GRID RATIO | show 🗑
|
||||
| x-ray grids with high contrast improvement usually effects resolution by? | show 🗑
|
||||
| which is the simplest type of grid? CROSSED GRID, FOCUSED GRID, LINEAR GRID, | show 🗑
|
||||
| show | grid cutoff
🗑
|
||||
| one factor that does not affect the percentage of scatter that reaches the IR? GRID MASS, GRID RATIO, kVp, mAs, PATIENT THICKNES | show 🗑
|
||||
| which of the following would reduce production of scatter? DECREASE IN FIELD SIZE, DECREASE IN SID, DECREASE IN OID, FILTER, GRID | show 🗑
|
||||
| what kind of grid reduces scatter along two axes? | show 🗑
|
||||
| show | may produce blur
🗑
|
||||
| when the air-gap technique is used, what happens to resolution? | show 🗑
|
||||
| when the air-gap technique is used, what happens to patient dose? | show 🗑
|
||||
| what happens if you replace an 8:1 grid with a 12:1 grid? | show 🗑
|
||||
| which has the greatest contrast improvement factor? CROSSED GRID, FOCUSED GRID, MOVING GRID, PARALLEL GRID | show 🗑
|
||||
| scatter photons increase contrast? TRUE OR FALSE | show 🗑
|
||||
| as irradiated tissue volume increases, scatter increases? TRUE OR FALSE | show 🗑
|
||||
| if the height of the grid is constant and distance is decreased between the lead strips there would be an increase in grid ratio? TRUE OR FALSE | show 🗑
|
||||
| show | false
🗑
|
||||
| a focus design results in a grid with strips designed to match the divergence of the x-ray beam? TRUE OR FALSE | show 🗑
|
||||
| if the x-ray tube is not centered on the central axis of the focus grid, it is termed lateral re-centering? TRUE OR FALSE | show 🗑
|
||||
| off focus errors result in grid cut off along the peripheral edges of the IR? TRUE OR FALSE | show 🗑
|
||||
| show | false
🗑
|
||||
| show | contrast
🗑
|
||||
| show | compton
🗑
|
||||
| grids remove scatter before the beam reaches the ________ | show 🗑
|
||||
| amount of grid scatter depends on what 3 factors? | show 🗑
|
||||
| show | height/distance
🗑
|
||||
| show | 80-90%
🗑
|
||||
| grid frequency is how many lines/inch? | show 🗑
|
||||
| show | bucky
🗑
|
||||
| show | grid cut off
🗑
|
||||
| show | 8:1
🗑
|
||||
| photons that pass through the body unaffected produce? | show 🗑
|
||||
| photon absorption within the body results from? | show 🗑
|
||||
| show | radiopaque lead, radiolucent
🗑
|
||||
| show | 6:1
🗑
|
||||
| show | to blur grid lines
🗑
|
||||
| show | increase in pt thickness, increase in field size, decrease in atomic #
🗑
|
||||
| show | contrast decreases, scatter increases, IR exposure increases
🗑
|
||||
| show | grid cut off
🗑
|
||||
| amount of scatter radiation is affected by? | show 🗑
|
||||
| grid cut off and off centering results in ______ of density | show 🗑
|
||||
| show | high-ratio grids
🗑
|
||||
| what is the result of replacing an 8:1 grid with a 12:1 grid? | show 🗑
|
||||
| besides an exam needed a wide rang SID, which grid would most likely produce grid cut off? 5:1 6:1 8:1 12:1 16:1 | show 🗑
|
||||
| when the air gap technique is used, what happens to contrast resolution? | show 🗑
|
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:
srehrauer