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What will an x-ray do when it enters a patient's body?(3)
2. be absorbed
3. produce scatter radiation
Scatter radiation disadvantages(4)
1. film fogging
2. decreases overall contrast
3. increases scale of contrast to a non-diagnostic level
4. causes safety hazards
Generally anything measuring ____ produces enough scatter radiation to decrease the detail on the finished radiograph
beam limiting devices do what
confine beam to only the area being examined, decreases the amount of tissue being irradiated
Cones are made of what and placed where to do what
lead cylinders of fixed sizes and placed over the xray tube to restrict the size of the primary beam to the size of the cone(round area)
Diaphragms are made of what placed where and come in what shapes
come in fixed sizes, are made of lead, placed on the tube head near the tube window, rectangular, circular, square
collimators are what and come with what, why
adjustable and come with a light for visualization of the actual size/area of the primary beam
aluminum filters are placed where and what is their function
over x-ray tube window, absorbs less penetrating xrays directly from primary beam
Air Gap technique OFD is increased from _ to _in, why
0 to 6 to reduce amount of scatter that will reach the film
Grids are used when imaging areas greater than____ and they decrease____ and increase____
10 cm, scatter, contrast
3 variables that determine grid effectiveness are
1. placement of strips
2. height of the strips
3. number of lines per inch
Grids absorb scatter radiation but unfortunately also absorb what
a large amount of the primary beam
only the xrays that can pass through ____ in perfect _____will expose the film
the plastic strips, alignment
3 ways to eliminate grid lines
1. increase the number of lines per inch
2. use thin lead strips
3. use a potter-buck mechanism
Bucky potter mechanism works how
sets grid in motion to blur the lines, a tray is placed beneath the bucky to hold the cassette, when an exposure is made the bucky will move the grid against the grid lines
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