SCATTER
Grids
KVP CHARTS
MORE mAS
Lower Extremity
100
The type of radiation that forms the image- The photons are absorbed in the patient
What is a photoelectric interaction?
100
The location of the grid
What is between the patient and the IR?
100
the tool used to measure the part thickness
What is a caliper?
100
What is the new mAs if you half the distance (going from 40 to 20 inches)
What is 4 times more
100
the bump on the outside of your lower leg is called
What is lateral malleolus?
200
Most of scatter comes from this interaction
What is a Compton interaction?
200
This type of grid when lead strips are aligned with the beam-must have SID for the radius.
What is a focus grid?
200
The amount of kVp needed to adjust for each cm of part thickness increase when using a variable kVP chart
What is 2 kVP per cm?
200
What is the technique chart that uses many different mAs values?
What is fixed kVp chart?
200
You would angle 10 degrees to the heel on this projection
What is AP axial foot?
300
If you have a thick body part you will MORE or LESS Scatter?
What is MORE SCATTER
300
A moving grid AKA
What is a bucky?
300
this chart uses many different mAs values
What is variable kVp chart?
300
this is the best way to reduce chances of motion
What is use the lowest time
300
the amount of rotation for the mortise ankle
What is 15 - 20 degrees medial?
400
will reduce scatter you do this to collimation.
What is increase to collimation?
400
a higher one will increase reduction in scatter
What is grid ratio?
400
The amount of mAs change used for every 2cm of thickness increase.
What is 30%?
400
my mA is 200 my time is .5 to increase the density by increasing mA only what mA should be used?
What is 400?
400
The IR size for the femur
What is 14x17
500
If you do this to kVp you will reduce scatter:
What is lowering kVp?
500
this happens when the tube is not perpendicular to the grid.
What is grid cut off?
500
When an image is to light what is the min. mAs increase?
What is double or 100% increase in mAs?
500
This is always used to reduce patient dose
What is use lowest mAs possible?
500
The name of the projection done if a patient can not do the frog-leg lateral hip
What is danelius miller or cross table lateral?
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