Scatter Radiation and Its Control Flashcards
Three types of interactions when radiation is absorbed by matter:
Coherent,Compton,Photoelectric effect
Interactions termed Scatter Radiation or simple scatter:
Coherent and Comption Effect
Interaction referred to as Secondary Radiation:
Photoelectric Effect
Coherent Scattering is also referred to as:
Thompson Scatter
Travels in all directions:
Compton Effect
X-Ray photon interacts with the outer orbital electron of an atom,removing it from from the atom(Ionization),and then proceeds in a different direction:
Compton Effect
Incoming photon from the primary bean collides with the inner orbital electron of an atom:
Photoelectric Effect
Scatter Radiation creates fog that reduces both contrast and:
Visibility of the spatial resolution
Four Primary factors directly affect the quantity of scatter radiation fog on the radiograph:
Volume of tissue,kilovoltage,density of the matter and field size
The thicker or larger the body part is:
The greater are the scatter and the fog
The denser the body part:
The lesser the scatter
The patient is the ______ source of scatter radiation
Primary
As collimation is increased ,or made larger :
Scatter radiation fog increases
The principle method for reducing scatter radiation fog is to use a:
Radiographic Grid
Is the relationship between the height of the lead strips and the width of the spaces between them:
Grid ratio
The number of lead strips per inch is called:
The Grid Frequency
Grids for general-purpose use are called ____ because the lead strips are aligned in the direction of the diverging primary X-Ray beam:
Focused Grids
The lead strips of a focused grid are precisely aligned with the X-Ray beam at a specific source-image receptor distance (SID),which is called a:
Grid Radius
The grid absorbs some useful radiation,the radiographic image includes an image of the grid itself.This is called:
Grid Lines or Grid Striping
A moving grid is called a:
Bucky
Is a special cassette with a grid built into the front side:
Grid Cassette
Excessive absorption of useful radiation by the grid is called:
Grid Cutoff
A grid with strips that are parallel to eachother ,rather than focused,is called a:
Parallel Grid
A composite of two grids with the lead strips at right angles to each other:
Crosshatch Grid or Crossed Grid
