Xray Production and Safety Flashcards
xrays are similar to visible light but with a _____ wavelength, giving them ____ energy
shorter, greater
digital images are stored in what kind of format?
DICOM
Which end of the x-ray tube are electrons generated at, and which do they travel to?
cathode, anode
which anode allows for greater dissipation of heat?
rotating
energy from electrons is converted to
99% heat and 1% xrays
Where is the xray cassette held?
the bucky tray under the table
what are cathode filaments composed of?
tungsten
What allows for excited electrons to be released from the cathode toward a focused target?
The focusing cap
What are the three measurements of the electromagnetic spectrum?
energy (eV), frequency (Hz), and wavelength
why is the xray tube enclosed in glass?
so that a vacuum can be created
why are short wavelengths better than long wavelengths?
more powerful, better penetration through mass.
What does the mAs setting on the x-ray machine control?
quantity of the electrons released
acceleration of electrons and their striking energy is determined by:
kVp
what structure holds the tungsten plate
anode
what kinds of screens glow after rad exposure
intensifying screens
what is the function of the grid?
decrease scatter radiation and increase contrast.
patients great than ___ should have the film placed in a grid holder
10cm
Why keep mA as high as possible?
to keep exposure time lower.
What are the three main factors of “technique”?
kV, mA, and time
what are three functions of a cassette
hold the intensifying screens, keep the film clean, keep light away from the film.
What is standard patient exposure measured in?
milliroentgens
What is the primary source of scatter radiation?
The patient
The program established to ensure radiation exposure is kept as low as possible:
ALARA - As Low As Reasonably Achievable.
What is the minimal rad protection?
gowns and gloves 0.5 mm lead equivalent; highly recommended to use eye and thyroid protection as well.
