Chapter 7 & 8 Flashcards
What 4 things are required to produce an X-ray
Vacuum - tube housing
Source of electrons - filaments
Rapid acceleration of electrons by voltage
Target to stop the moving electrons
What is the X-ray leaving the tube known as
X-ray photons
X-ray beam
Beam before it reaches the patients and interacts with the patients body
Primary radiation
Beam that exits the patients body
Remanent radiation
Beam interacts with the patients body and then changes direction becomes what?
Scatter radiation
Diagnostic image is what?
A good quality image
Nondiagnostic image is what?
Repeated image
Something stops the beam from coming through is what
Radiopaque
Something that the beam passes easily through is what
Radiolucent
Is the X-ray table radiopaque or radiolucent
Radiolucent
Milliampere-seconds (mAs) controls what
Quantity of photons - brightness
How do you calculate mAs
Milliampere x seconds
Kilovolt peak (kVp) controls what?
Quality of the photons - contrast
What are the two types of image receptors
Computed radiography
Digital radiography
Which IR uses a cassette with imaging plate that receives the exposure.
Computed radiography
Which IR uses a cassette less imaging plate that displays on a monitor
Digital radiography
What is density
Overall blackening of the film - now known as IR exposure (brightness)
What can you use to lighten and darken the overalls brightness of the digital image
Window level
What is contrast
Visibility of detail. Ratio of black to white
What is window width?
Control for contrast
High contrast means what
Few grey tones
Short scale
Narrow exposure latitude
Low kVp
Low contrast means what
Many gray tones
Long scale contrast
Wide exposure latitude
High kVp
Which end is negative : Cathode or anode
Cathode
Which end is positive : cathode or anode
Anode
What is the only part of the X-ray tube that is outside of the glass housing
Stator
What does the photons come out of
Port
Where do the electrons come from
Filaments in the focusing cup
What do the electrons strike in the X-ray tube
Anode disk made of tungsten/rhenium
What holds the anode disk in place
Anode stem
What is the anode stem connected to
Rotor and anode disk
What holds the X-ray tube all together
Glass envelope
What is the glass envelope made of
Pyrex
What does the vacuum tube lack
Air
What produces the X-rays
X-ray tube
What powers the X-ray tube
Generator
What is the ceiling suspension for the X-ray tube called
Overhead tube crane
Where does the collimate sit
Below the X-ray tube
What controls the size and shape of the field size
Collimator
Which end is the cathode always on
Right
Which side is the anode always on
Left - patients head
Where is the bucky mechanism
Under the X-ray table
What does the Bucky mechanism have to be aligned with
The light source
Who made the Bucky tray
Gustave Bucky
Which X-ray table is curved on the outside
Fluoroscopy table
What does unwanted exposure cause
Fog
