Week 7- Chapter 15 Flashcards
Where is milliamperage adjusted?
By the technologist on the console
What does milliamperage control?
Resistance in the wire leading to the filament
What happens to electrons when mA is increased?
The flow of electrons are increased and the filament heats up which allows more electrons to be boiled off
What impact does an increase in mA have on photon quantity?
Increases the quantity (intensity)
What is the proportional relationship between mA and photons?
Directly proportional
What controls the intensity of the x-ray beam?
The mA station on the console
If mA is doubled how many x-rays will be produced?
X-rays will be doubled
How is exposure time measured?
In seconds (usually milliseconds)
What is exposure?
The amount of time the beam is activated
What is the proportional relationship between exposure and intensity?
Directly proportional
What is the proportional relationship between mA and time?
They are inversely proportional
If you want to maintain an exposure, how would mA or time be adjusted?
Raise mA and lower time OR raise time and lower mA
What is the formula for reciprocity law?
mAo x so = mAn x sn
How does the reciprocity law work?
The product of mA and time must yield the same mAs to maintain a specific exposure
How is mAs defined?
The product of milliamperage and seconds