Imaging equipment Flashcards
Equipment in a General X-ray Room
X-ray Tube Tube Support/Mechanism X-ray Table Upright Bucky Control Console Radiation Protection Aids Cassettes Positioning Aids Portable Grids Patients!
The Envelope is made of
Pyrex glass or metal to withstand heat
Purpose of the envelope
Maintains a vacuum
The Cathode
Filament – most tubes are “dual focus” tubes meaning they have 2 filaments
Filament emits electrons through thermionic emission
Made of tungsten to withstand high heat
negative side of the x-ray tube
Anode
Made of Tungsten
Tungsten
W
high atomic number
high melting point
thermal conductivity
Protective Housing
Lead-lined to absorb photons and prevent leakage radiation
Isolates high voltage by surrounding tube with oil
Cools the tube
*99% of electrons converted into heat
Exposure Console
Anatomically programmed Pre-set exposures Manual exposure values available to radiographer (mA, kVp, time) Located outside of the radiographic exam room
Mobile Diagnostic Equipment
Stability and flexibility required
Battery-powered most common
6 foot exposure cord for radiation protection
Image Intensifier
brightens the fluoroscopic image
Direct Digital
Photons converted directly to an electronic signal
Uses a photoconductor – typically amorphous selenium
Image displayed on monitor
Sent to PACS
PACS
Picture Archiving and Communications Systems
Other Equipment ….
Radiographic Grids Grid Holders Lead Aprons/Gloves/Thyroid Shields Positioning Sponges Lead Positional Markers
Computed Radiography (CR)
Uses a cassette with a photostimulable phosphor
Image processed in a reader where the plate is scanned by a laser beam
Digital image displayed on a cathode-ray tube(CRT) display monitor or LCD device
Sent to PACS for storage, image retrieval, manipulation, etc.
Digital imaging and communications in medicine(DICOM) allows communication between PACS and other imaging modalities
