IR Exousre Major influences Flashcards
What are the 4 major anatomical parts that influence IR exposure
Thickness
Tissue type
Pathology
Contrast media
On a thicker body part, is the IR exposure being increased or decreased
Decreased
As the body part thickens, what must you also change
Must increase mAs or kVp
To maintain ir exposure
How does tissue types affect ir exposure
It affects beam attenuation based in composition and density
As tissue type and density increase what must we do
Increase mAs
To maintain IR exposure
How does additive pathology affect IR exposure
Decreases IR exposure
How does subtractive pathology affect ir exposure
It increases IR exposure
How does positive contrast media affect IR exposure
Abosorbs X-rays
Decrease IR exposure
How does negative contrast media affect IR exposure
Allows X-rays to pass through
Increase IR exposure
What are grids used for
To absorb scatter radiation from patient before scatter reaches IR
Why is more mAs required when using a grid
To maintain IR exposure
What happens if you use a grid and DONT correct the mAs
IR exposure will be too low
Explain the High and low grid ratios
High ratios : more lead
Low ratio: less lead
If you increase your SID (distance ) what happens to IR exposure
IR exposure will decrease ( inverse relationship)
As you SID (distance ) decreases, what happens to your IR exposure
IR exposure will increase
