Lecture 2 Flashcards
What is a purpose of x ray machine ?
Provide a specific current (mA) & voltage (kVp) to the x-ray tube
( controls the energy and number of the x-ray photons )
convert electrical energy to electromagnetic energy (x- ray photons)
What are the main components of radiographic room ?
- High Voltage Generator
- X-ray Tube
- Operating Console
- X-ray Table
High voltage generator ?
Converts the low voltage supplied from the power company into high Kilovoltage ( produce x rays)
Connected to the x-ray tube via cables
It is also called Transformer
X ray generator ?
It controls the energy and number of x rays
Has 2 major parameters that describes x ray exposure such as ?
Kvp and mAs
x ray tube support ?
Provides support and mobility for the tube
Has 2 types :
Ceiling mount/ suspension , Sets of rails controls
Floor stand , mounted on floor
What is designed to help technologists with various tube locations for creative imaging ?
Tube support
Such as : Floor mounted , Floor to wall mounted , Floor to ceiling mounted , Table supported and overhead suspension
X ray tube housing ?
Lead and steel , absorbs radiation
and Prevents x-ray photons from leaking from tub
what are other component’s on x ray tube ?
Collimator light , Collimator controls
, Transverse lock and horizontal lock
Collimator ?
Attached to tube housing
Controls the size of radiation field
light provides centering lines to aid in alignment of IR to patient
Always collimate smaller than the size of cassette
Input device for setting exposure factors, activating the exposure, and on/off powering of the unit is ?
x ray console - control ( located in shielded control booth )
which set technical factors/ make an exposure
Control panel of an x ray unit contains ?
The main switch , Indicator light , Exposure button and Control device
Radiographic table ?
Specialized unit that supports the patient
Most move in several directions
Moveable IR tray with a grid located under top
Holds bucky ( limit 300Ibs)
Easily cleaned and hard to scratch
3 ways of radiographic table ?
Tilting or Non-tilting
Free-floating , motorized or stationary top
Adjustable or non-adjustable height
Tilting ?
90-90 tilting table : Can tilt from the horizontal position to a complete vertical position in either direction
90-30 tilting table: Can tilt from the horizontal position to a complete vertical position in one direction and to a 30 degree tilt in the other direction
Free floating or stationary top ?
Free floating : Has a locking mechanism that when it is turned off, allows the radiographer to move the table top manually
Motorized : Has a switch that drive the table top in the desired direction
Stationary : The table top does not move, the radiographer must move the patient
Adjustable or non -adjustable height ?
Adjustable : The height of the table can be adjusted to a comfortable level for the patient and technologist
Non-adjustable : The height may not be adjusted
what are auxiliary equipment ?
Bucky tray , Image receptor , Grids
CR Reader , Darkroom and Collimators
Does the grid reduce radiation exposure ?
No because it is placed behind the direct object
upright bucky tray ?
A device that holds the IR and/or a bucky (grid)( drawer) in a vertical position
The bucky tray can be found:
In the table or chest board
Holds the cassettes CR or Film Screen
Image receptor ?
In table bucky and upright bucky
Grid and bucky ?
Devices used to reduce the effect of scatter radiation on image quality
Prevents scatter from reaching the IR
What is darkroom ?
Is a controlled environment where X-ray films are processed , Is designed to prevent light exposure that could damage the films
What is in darkroom ?
Safe light and Film processor
Computed Radiography ?
Re-usable metal imaging plates replace film & cassette
Uses conventional bucky & x-ray equipment
