Flashcards in Ch 1 Deck (18)
Milliamperage seconds (number of electrons and number of x-rays)
mA x time
Source to image receptor (as far back as possible)
Object to IR distance
Always want object as close to IR as possible otherwise magnification distortion occurs (ex: shadow)
Want heart closer to IR
Kilovoltage peak (penetrating ability of x-rays)
One thousandth of the unit to which it's joined
1/1000 ampere (1000 mA = 1 A)
1/1000 second (1000 ms = 1 s)
1/1000 meter (1000 mm = 1 m)
An amount 1000 times the unit to which it's joined
Intensity of the beam is "inversely" proportional to the "square of the distance"
Intensity of the beam decreases by 4 when the distance is doubled and is increased by 4 when the distance is halved
Inverse square law
Formula used when changing distances (SID)
Exposure/density maintenance formula
Similar triangles formula
What does b in similar triangles formula represent?
Base of small triangle (object)
What does B in similar triangles formula represent?
Base of big triangle (IR)
What does h in similar triangles formula represent?
Height of small triangle (distance from object to source)