Lab Test 2 (6 mAs) Flashcards
What happens when we xray larger body parts or use higher kVp
there is more scatter radiation
what is scatter radiation
it is the result of the interaction of the primary beam with the matter being exposed
more radiation + more tissue=
more scatter radiation
what does scatter radiation result in
a loss of contrast and sharpness of the image
what is the ability of the grid to control scatter radiation dependent on
the ration adn frequency of the grid
what is grid ratio
the height of the lead strip compared to the width of the space between the strips
what is frequency
the number of strips per inch
what is a 5:1 grid limited to
below 90kVp
high ratio grids can be used up to what
125kVp
What will a 10:1 grid with 100 line provide
excellent clean up of scatter radiation
What is the air-gap method
when the body part is far away from the film, the scatter radiation disperses in the air before it can act with the film
How does the image taken without a grid (A) compare to the high ratio and high frequency image (C)
Image A lacks contrast compared to image C
Low frequency grid vs high frequency grid
has more grid lines that show up on the xray than high frequency grid
What must be done when high frequency and ratio focused grids are used
the lead strips must be perfectly aligned with the primary beam
what will a misalignment of more than 2 degrees cause
a grid cutoff
