Medical Imaging Extra Credit Quiz (1) Flashcards
X-Rays behave both like _______, in that they have a wavelength and frequency, and _________, in that they move as photons.
Waves
Particles
X-Rays are electrically: A. Positive B. Negative C. Neutral D. sometimes positive and sometimes negative, depending on the energy used
C. Neutral
X-rays travel at the speed of _______ light in a vacuum
Light
The _______ of an x-ray tube is a negatively charge electrode, while the ______ of an x-ray tube is a positively charged electrode.
Cathode
Anode
In the x-ray tube, electrons flow from _______ to _______?
Cathode
Anode
________ _________ refers to the boiling off of electrons from the wire _______?
Thermionic Emission
Filament
The ______ of the x-ray beam indicates the number of x-ray photons in the primary beam, and the _______ of the x-ray beam indicates its penetrating power.
Quantity
Quality
The quality of the x-ray beam refers to its energy level. Therefore, adjusting the _____ affects the quality of the x-ray beam.
KVP
_______ determines the number of electrons flowing in the tube and the quantity of x-rays produced.
MAs
What is the unit used to measure tube current ________?
Milliamperage
What is the one task you can complete to extend x-ray tube life?
heat 2 hours prior to use
As electrons strike the anode target, ______ percent of their kinetic energy is converted to heat, and less than _____ percent of their energy is converted to x-rays.
99%
1%
While radiography and radiation therapy uses ______ , PET makes use of ________?
Photons
Gamma Rays
The rotating anode is made of a transition metal with a high melting point. What element is the rotating anode made of ?
Tungsten
Above 70KVP, ______% of the beam results from bremsstrahlung interactions, while ______% consisits of characteristic x-rays.
85%
15%
