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Chapter 2
SWGTC-R/T-Chapter 2-Wallace-The Production & Properties of x-rays
Question | Answer |
---|---|
How are x-rays produced within the tube? | Electrons are released from the cathode, zoom over to the anode, collide and x-rays are produced. |
negatively charged | cathode |
positively charged | anode |
what does the cathode consist of? | a focusing cup and 2 filaments |
what is a filament? | tiny wire made of tungsten and shaped into a coil |
why does the anode rotate? | the anode rotates while x-rays are being produced so that the production of x-rays happens all around the edge called the focal track. |
After x-rays are produced, where do they exit through before reaching the patient? | a window |
When releasing electrons from the cathode, the current causes the filament wires to get so hot that they glow. This glowing is called_________. | incandescence. |
The process in which electrons are "boiled off" is called__________. | thermionic emission |
A small focal spot will produce <better/worse> recorded detail | better! |
radiation that leaks out through the lead glass and metal housing | leakage radiation |
heterogeneous/poly energetic | the x-ray beam consists of millions of photons that have different energies |
the beam that is directed towards the patients body | primary beam |
three things that can happen as the primary beam enters the body | photons could be absorbed, photons could pass through the pts. body and enter the film, or photons could hit something in the body, bounce off and fly in a new direction |
the photons that pass through the pts. body and enter the film puts _________ on the film. this radiation is called _______. | density, exit radiation |
the photons that fly off in a new direction are called ________. | scattered radiation |
scatter <increases/reduces> radiographic contrast. | reduces |
phosphors glow when struck by x-rays. this glowing is called __________. | fluorescence |
an intensifying screen is coated with _________. | phosphors |