Imaging Equipment
What are the 3 parts of a transformer?
1. Core
2. Primary Coil
3. Secondary Coil
What part of the radiographic unit allows the radiographer to adjust the technical factors?
Operating console
Each cassette is identified with a ?
Barcode
What is the material of the heated filament?
Tungsten
What is the term for the average energy of x-rays
Quality
What is rectification?
Process by which alternating current is changed to pulsating direct current by using rectifiers
What side of the x-ray tube is negatively charged, and which side is positively charged?
Cathode = negative
Anode = positive
What does the light- reflective layer do?
Sends light in a forward direction
How much energy in the tube is converted to heat & to x-ray photons?
Heat (99%)
X-ray photons (1%)
What is the term that refers to the total number of x-rays, also known as beam intensity
Quantity
What is a generator?
Device that converts mechanical energy to electrical energy
These 3 functions belong to what part in an x-ray tube
-produces a thermionic cloud
-provides a high voltage to the electrons
-Focuses the electron stream
Cathode assembly
Fast scan direction is the movement of ? in the reader?
The laser across the imaging plate
What type of x-rays are the most diagnostic x-rays?
Bremsstrahlung
What are the two types of Coherent scatter?
1. Thomson scattering
2. Rayleigh scattering
Function of the primary and secondary coils in a transformer
Primary Coil: supplies transformer with current
Secondary Coil: induces electrical current
What is the minimum response time of most modern AECs?
0.001 seconds
Slow scan direction(translation or subscan direction) is the movement of ? in the reader?
The imaging plate
3 primary reasons why Tungsten is used as the metal of choice for the source of x-ray photons
1. High atomic number
2. High melting point
3. Heat conducting ability
This interaction occurs when when the incident x-ray photon possesses a slightly greater energy than the binding energy of the electrons in the inner shells
Photoelectric absorption
Function of the diode
When the current reaches the diode, it converts alternating current into direct current
U.S. public law requires generators to terminate AEC exposures at what mAs?
600mAs
Which type of scintillator is grown into thin crystalline needles?
Cesium Iodide
If an exposure is made at 100kVp, about what percent of the x-ray beam is characteristic?
15%
This type of scatter takes place when an incident x-ray photon interacts with a loosely bound outer-shell electron which then removes that electron from its shell and then will continue on in a different direction as a scattered photon
Compton scattering