Control of Scatter Radiation... Radiographic Grids
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| What is the main reason for using a grid? | show 🗑
|
||||
| show | Grid ratio
🗑
|
||||
| Interspace material is... | show 🗑
|
||||
| show | Automatic shuttering
🗑
|
||||
| What photon interaction do we get scatter from? | show 🗑
|
||||
| show | cassette size, primary beam
🗑
|
||||
| Sensors are located on the tube stand to monitor _____. | show 🗑
|
||||
| Where do we place the grid? | show 🗑
|
||||
| show | grid cut off
🗑
|
||||
| Guarantee of patient protection, clearer images, more reliable, eliminate error, save set up time are all_______. | show 🗑
|
||||
| show | Air gap technique
🗑
|
||||
| Mostly used inn cervical/chest area and SID must increase to compensate for increase in OID is ________. | show 🗑
|
||||
| The most commonly used grid is .... | show 🗑
|
||||
| show | lead rubber masking
🗑
|
||||
| show | high kV
🗑
|
||||
| Placing sheets of lead rubber dividers on table into position so they absorb unnecessary radiation will ____ of radiograph. | show 🗑
|
||||
| Better and least patient exposure use _____ | show 🗑
|
||||
| ____ reduce tissue volume and are helpful in controlling scatter. | show 🗑
|
||||
| show | increase magnification
🗑
|
||||
| show | reduction
🗑
|
||||
| Grid ratio produce most density with a ____. | show 🗑
|
||||
| show | grid
🗑
|
||||
| Grid ratio produces the least density with _____. | show 🗑
|
||||
| show | collimation
🗑
|
||||
| show | Gustave Bucky
🗑
|
||||
| show | stationary
🗑
|
||||
| The grid absorbs ____ of secondary/scattered radiation. | show 🗑
|
||||
| Disadvantage of stationary grids are the lead strips cast a thin white line on radiograph, exposure must be ____ bc of this. | show 🗑
|
||||
| show | 60 to 80
🗑
|
||||
| Which grid produces the longest scale of contrast? | show 🗑
|
||||
| What grid has lead strips parrallel to each other and thickness decreases as they move to the edge? | show 🗑
|
||||
| The thickness of lead strips decreasing at the edge is to try and overcome primary _____. | show 🗑
|
||||
| show | cut off
🗑
|
||||
| Which grid produces the highest contrast? | show 🗑
|
||||
| Parrallel grids are used with techniques under ____ and with portable units. | show 🗑
|
||||
| When using a grid with a 1 way angle you ____. | show 🗑
|
||||
| show | focused grid
🗑
|
||||
| When 2 linear grids are accidentally placed on top of each other | show 🗑
|
||||
| Higher grid frequency = | show 🗑
|
||||
| show | 25%
🗑
|
||||
| show | 15%
🗑
|
||||
| 2 stationary grids used on top of each other, each at right angles, can be parrallel or focused. | show 🗑
|
||||
| With a cross hatch grid the least amount of positioning lattitude the ___ grid ratio | show 🗑
|
||||
| show | cross hatch grids
🗑
|
||||
| Angiography, trans table lateral fro mylegraphy, and shoot thru lateral hips use | show 🗑
|
||||
| Who invented the moving grid? | show 🗑
|
||||
| Moving the grid perpendicular to the direction of lead strips made them ____ | show 🗑
|
||||
| show | common causes of grid lines
🗑
|
||||
| What are the 3 types of moving grids? | show 🗑
|
||||
| What is the most commonly used moving grid? | show 🗑
|
||||
| The process of manufacturing a grid and inclining its lead lines to a fixed focusing distance | show 🗑
|
||||
| Because of grid impurities, never accept a grid unless you inspect it with an ____ | show 🗑
|
||||
| 2 physical properties responsible for efficiency of a grid inn removing scatter | show 🗑
|
||||
| The number of lines per inch is ______ | show 🗑
|
||||
| show | r = h/d
🗑
|
||||
| As you increase grid ratio you ___ contrast and ____ density | show 🗑
|
||||
| The higher grid ratio the better will be ____ of scatter and ___ radiographic contrast. | show 🗑
|
||||
| show | greater
🗑
|
||||
| show | 8:1
🗑
|
||||
| Most stationary are | show 🗑
|
||||
| When converting from non grid to grid, change is best made by adjusting _____ | show 🗑
|
||||
| In grid frequency, the thinner the strips and greater the chance of scatter rays passing through the more _____ | show 🗑
|
||||
| show | grid material
🗑
|
||||
| show | increase, increase
🗑
|
||||
| Less than _____ of density should be scatter | show 🗑
|
||||
| show | 1
🗑
|
||||
| Use of a moving grid instead of stationary will require ___ more radiation exposure | show 🗑
|
||||
| Most common grid frequency used in rad dept. is ___ per inch | show 🗑
|
||||
| Purpose of interspace material is to maintain ___ between strips of lead | show 🗑
|
||||
| show | aluminum , plastic fiber
🗑
|
||||
| show | aluminum interspace material
🗑
|
||||
| Usually preferred over aluminum b/c reduces patient exposure | show 🗑
|
||||
| Does not absorb moisture | show 🗑
|
||||
| ____ is easier to form and roll into sheets of precise thickness than ____ | show 🗑
|
||||
| Amount of secondary radiation (thickness, density) kilovoltage used, capacity of x-ray generator are all factor in _____ | show 🗑
|
||||
| show | lower
🗑
|
||||
| _____ is based on positioning lattitude along with other factors | show 🗑
|
||||
| The ___ the grid ratio the less positioning lattitude | show 🗑
|
||||
| Parrallel grids have more ___ than focused and cross hatch have no_____ | show 🗑
|
||||
| Grids should be used when the body part is atleast___ thick (some say ___) | show 🗑
|
||||
| show | grid cut off
🗑
|
||||
| ___ occurs b/c primary beam gets absorbed closer to outside edges. | show 🗑
|
||||
| show | primary cut off
🗑
|
||||
| show | off distance cut off in a focused grid
🗑
|
||||
| In a focused grid when CR is not centered (area below CR will have density & rest white) and the grid is not parrallel with plane of the tube you will have ____ | show 🗑
|
||||
| show | tube side vs film side
🗑
|
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:
bmiller1226
Popular Radiology sets