+
Cards In This Set
| Front | Back |
|
Name 8 factors that affect recorded detail.
|
1. Motion
2. SID 3. OID 4. Focal Spot Size 5. Film/Screen Speed 6. Film/Screen Contact 7. Noise (e.g. Quantum Mottle) 8. Thickness of Patient Part |
|
When SID (source to image receptor distance) increases, detail _________.
|
Increases
|
|
When OID (object to image receptor distance) increases, detail _________.
|
Decreases
|
|
When Focal Spot Size increases, detail ________.
|
Decreases
|
|
When film/screen speed increases, detail ________.
|
Decreases
|
|
Recorded detail can be defined as:
|
The degree of geometric sharpness or accuracy of the structural lines actually recorded in the image (resolution tool is used).
|
|
spatial resolution is synonymous with ________.
|
Recorded detail
|
|
A higher amount of line pairs per millimeter affects detail how?
|
By increasing it
|
|
Actual focal spot can be defined as:
|
The spot on the anode where beam hits.
|
|
Which side of the tube provides the most intense beam?
Detail is always greatest at the ______ side and cathode side has greater __________. |
Cathode ( - )
Anode ( + ) Blur |
|
*** You can find your new mAs with this formula... (mAs/distance formula, exposure maintenance formula)
|
new SID 2 (squared)
old SID X old mAs |
|
*** To find new seconds (when doing mAs/distance conversions), use this formula:
|
new mAs
new mA |
|
*** What are the only 3 things (technical factors) do we need to consider when finding which set of technical factors will produce the greatest amount of recorded detail?
|
SID, OID, and Focal Spot Size
|
|
What 3 qualities of a film screen determine how much detail will be displayed?
hint: phosphors
|
1. Size of phosphor in
screen
2. Phosphor layer
thickness
3. Phosphor concentration
|
|
How do you determine the magnification factor?
|
SID
SOD |
