IMAGING SYSTEM Flashcards
he discovered the x-rays
wilhelm conrad roentgen
discovery of x rays
november 8 1895
where did he discovered the xrays
wurzburg university in germany
original fluorescent material
barium platinocyanide
recent fluorescent material
zinc cadmium sulfide &calcium tungstate
Clarence Dally (1904)
experienced a severe xray burn that eventually required amputation of both arms, died in 1904 and is counted as the first x-ray fatality in the United States
william rollins
demonstrated the first application of collimation and filtration
H.C Snook (1907)
introduced the interrupterless transformer,
“snook transformer”
Williiam D. Coolidge
introduced the coolidge xray tube
why did xray emerged as a medical specialty?
because of snook transformer and the coolidge x-ray tube
Gustav Bucky (German) (1913)
he invented the stationary grid (“glitterblende”)
H. Potter (American) (1915)
probably unaware of Bucky’s patent because of wwii, invented a moving grid
when did the potter-bucky grid introduced?
1921
radiography
it Uses film or a solid-state image receptor and provide fixed images
FLUOROSCOPY
Conducted with an x-ray tube located under the examination table.
Provided with moving images on a television monitor or flat panel display.
COMPUTED TOMOGRAPHY
Uses a rotating x-ray source and detector array
wife of reoentgen
Anna Bertha Ludwig
Thomas A. Edison (1898)
discovered the fluoroscope
Michael Pupin (1898)
demonstrated the use of intensifying screen
Charles L. Leonard (1904)
demonstrated the use of double emulsion film
what is the function of x-ray imaging system?
The function of the x-ray imaging system is to provide a controlled flow of electrons intense enough to produce an x-ray beam appropriate for imaging.
May be flat or curved but must be uniform in thickness and as transparent to x-rays as possible.
EXAMINATION TABLE
radiolucent
a property of material that allows x-rays to pass through
radio paque
a property of material that absorbs xray
3 main components of xray imaging system
- xray tube
- operating console
- high voltage generator
The fluoroscopic x-ray tube is usually located
under the examination table
the radiographic x-ray tube is attached to
an overhead movable crane assembly that permits easy positioning of the tube and aiming of the x-ray beam.
these couches are strong and absorb little x-radiation. This contributes to reduced patient radiation dose
carbon fiber
must have a window for viewing the patient during the examination
protective barrier
may be housed in an equipment cabinet positioned against a wall
high voltage generator
Radiation quantity
mAs, refers to the number of x-rays or the intensity of the x-ray beam.
Radiation quality
kVp, refers to the penetrability of the x-ray beam
Most x-ray imaging systems are designed to operate on
220 V power
line compensator
measures the voltage provided to the x-ray imaging system and adjusts that voltage to precisely 220 V.
The power supplied to the x-ray imaging system is delivered first to the
autotransformer.
Has a single winding
auto transformer
the exposure begins at maximum mA, and the mA drops as the anode heats.
falling load generator
X-ray tube current is monitored with an mA meter that is placed
in the tube circuit
Filament Transformer
filament heating isolation step-down transformer.
4 types of exposure control
- synchronous timers
- electronic timers
- mAs timers
- automatic exposure control
solid state radiation detectors is also called
semiconductor radiation detector
