Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
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
Pre 1 Chap 37
Tomography and mobile
| Question | Answer |
|---|---|
| what is the principal advantage of tomography | improved image contrast |
| what is the fulcrum | pivot point around the motion of the tube and the IR |
| is tomography dynamic or static process | dynamic |
| is the exposure angle to thickness a inverse or direct relationship | inverse |
| OID increases, blur _________, OID decreases blur _________ | increases decreases |
| exposure amplitude and slice are _________ related | reversely related |
| what kind of imaging is tomography | imaging by section |
| when was tomography developed | 1921 |
| exposure amplitude and blur are __________related | directly |
| when there is a _______ distance from fulcrum than a ______ blur will occur | large large |
| what % in change is minimal to provide a visible difference | 4% |
| what are the types of motion | linear curvilinear |
| what is blur affected by | exposure amplitude distance from fulcrum distance from IR (OID) orientation of tube motion |
| where is the focal plane | plane where the anatomy of interest is located |
| what is the phantom image | blur edges or blur margins |
| what is section thickness | width of focal plane controlled by exposure arc/angle |
| define linear motion | moving along a straight line |
| define curvilinear | linear direction of motion |
| what are some problems with linear movement | constant fluctuation of SID and OID structure parallel to motion are not as blurred arc/or angle is limited to 48º deduction distortion |
| what is the pros of curvilinear | maintains SID and OID and reduced magnification differences |
| what are the pros of digital tomosynthesis | images manipulated by post acquisition algorithm instead of producing additional images |
| how many images are required for reprocess in tomography | 10 |
| what will determine how much tissue is visualized | thickness |
| true or false tomography is used to localize object from super imposition | true |
| how many seconds are required for exposure in tomography | 3-6 seconds |
| what will happen with too short of exposure in tomography | full blurring will not occur |
| what will happen with to long of exposure | density will increase |
| how can you eliminate scatter | tight collimnation parallel grids and grid lines in same direction as tube motion |
| what is zonography | narrow angle tomography |
| narrow exposure tomography exposure amplitude is less than | 10º usually 5-10º |
| what is wide angle tomography | when exposure amplitude is greater then 10º usually 30-50 |
| narrow angle tomography has ________ ________ but ________ _________ because of thickness | reasonable contrast poor detail |
| wide angle tomography has ________ ________ but ________ _________ because of thickness | low contrast fair recorded detail |
| what is the principal disadvantage for tomography | increase pt dose |
| tomography is a technique that employees what kind of motion | synchronous motion with the CR and IR |
| tomography primarily demonstrates which section | coronal |
| the chest is best proformed in what position | erect |
| how many lead aprons should be on the mobile machine | 2 you and pt |
| what are the radiation protection consideration | time shield distance |
| what are complex types of motion | linear circle elliptical figure 8 hypocycloidal trispiral |
Created by:
knt5411
Popular Radiology sets