Three Principal Parts of X-ray Imaging System Flashcards
WHAT ARE THE THREE PRINCIPLES PARTS OF X-RAY IMAGING SYSTEM
- Operating Console
- X-Ray Tube
- High Voltage Generator
Allows the radiologic technologist to control the x-ray tube current and voltage so that the useful x-ray beam is of proper quantity and quality.
Operating Console (Control Console)
kVp covers the —— ; The —— the kVp, the —— the quality
kVp covers the quality; The higher the kVp, the better the quality
kVp covers the —— ; The —— the kVp, the —— the quality
kVp covers the quality; The higher the kVp, the better the quality
refers to the penetrability or permeability of the x-ray beam
Quality
energy that determines the penetrating ability of the x-ray
kVp (kilovoltage peak)
Controls your kvp and mAs selection (quality and quantity of x-rays)
Control Console
mAs covers the —— of x-rays, the —— the mAs, the —— the number of x-rays
mAs covers the quantityof x-rays, the higher the mAs, the higher the number of x-rays
refers to the numbers of x-rays or the intensity of the x-ray beam
Quantity
Quantity is represented by ——?
the unit MR [milliroentgen] or
mAs [milliampere-second – mA x time (seconds)]
measures the intensity of the x-ray beam and the number of electrons crossing from cathode to anode
mAS (milliAmpere)
Varies or controls the voltage to 100V-220V.
AUTOTRANSFORMER
- Stands for two separate series of connections on the autotransformer.
- Located at the secondary side of the autotransformer.
Major kVp and Minor kVp
- Design to supply a precise voltage.
- This control is wired to the primary side of the autotransformer.
Line Compensator
allows the voltage to be monitored before the exposure.
Pre-Reading Voltmeter
Responsible for X-ray production
X-Ray Tube
X-ray tube will not turn on if the current is ——, only runs in ——
X-ray tube will not turn on if the current is AC, only runs in DC
part of the Cathode which is being targeted to produce heat
Filament
Filament uses —— to release electrons
2200 C
the process of heating the filament that leads to the release of electrons
Thermionic Emission
- circuit where the x-ray tube is controlled
- controls the heat
Filament Circuit
Monitored with an mA meter that must be placed in the tube circuit
Tube Current
is connected at the center of the secondary winding of the high voltage step up transformer
mA METER
- Separate from the other main circuit of the x-ray machine.
- Consists of mechanical or electronic devices whose action is to
“MAKE” AND “BREAK” the high voltage across the x-ray tube.
Timer Circuit
Determines the number of electrons emitted by the filament
TEMPERATURE OF THE FILAMENT
Temperature is controlled by the filament current which is measured in ——?
Ampere
Increases the voltage from the power source to create or produce x-ray
High Voltage Generator
High Voltage Section of the X-Ray Imaging System
High Voltage Generator
Low Voltage Section of the X-Ray Imaging System
Control Console
What are the three parts of the HVG?
- High Voltage Transformer (HVT)
- Filament Transformer (FT)
- Rectifier
o Is a step- up transformer
o Provides high voltage to the x-ray tube
High Voltage Transformer (HVT)
Turns ratio of high-voltage transformer is usually between ————
500:1to 1000:1
o Is in-charged for increasing the current and the intensity for the filament to be heated.
o Provides high current to the x-ray tube.
Filament Transformer (FT)
- Device that converts AC to DC
Rectifier
General Power source: ?
220 AC
Five Types of X-Ray Timer
Mechanical Timers
Synchronous Timers
Electronic Timers
mAs Timers
Automatic Exposure Controls (Phototimer)
works under clock system
very simple device used only in some portable and dental units.
Mechanical Timers
is the PRECISION DEVICE designed to drive a shaft at precisely 60rps
Synchronous Timers
Minimum exposure time of Synchronous Timers
minimum exposure time, 1/17 msec
Are the most sophisticated, most complicated and most accurate of the x-ray exposure timers.
Can be used for rapid serial exposures.
Electronic Timers
Device that is the product of mA and time
Determines the number of x-rays emitted
mAs Timers
Monitors the product of mA and exposure time and terminates the exposure when the desired mAs is attained.
mAs Timers
a device that measure the quantity of radiation reaching the image receptor.
Automatic Exposure Controls (Phototimer)
terminates the exposure when the desired density is attained.
Automatic Exposure Controls (Phototimer)
Critical component of one type of phototimer is
———?
PHOTOMULTIPLIER SENSING DEVICE
