Equipment Operation and Maintenance
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Transcript of Equipment Operation and Maintenance
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Equipment Operation and Maintenance
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Grid-controlled tube
• Designed to turn on and off rapidly, providing short precise exposures
• Use in fluoro and in capacitor discharged (condenser-discharge) mobile units
• Uses a molybdenum focusing cup
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FLUOROSCOPY
• INPUT PHOSPHOR– LARGE DIAMETER– CESIUM IODIDE– X-RAYS LIGHT
• PHOTOCATHODE– LIGHT ELECTRONS
• OUTPUT PHOSPOR– SMALLER DIAMETER– ELECTRONS LIGHT
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FLUORO CONT.
• FOCUSSING LENSES• VIDICOM/PLUMBICON• BEAM SPLITTING DEVICE• mA• ABS• AGC or ABC
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• FLUX GAIN=# OF OUTPUT LIGHT PHOTONS
# OF INPUT LIGHT PHOTONS• MINIFICATION GAIN = Diameter of input (squared) diameter of output (squared• BRIGHTNESS GAIN:minification x flux
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• Trifield Tubes• 25/17/12
smaller diameter of input phosphor reduces:field of viewmagnificationminification gain dimmer image
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Larger film formatgreater the # of films =higher patient
exposure
• Cinefluoroscopy– rapidly obtained photospot image
(35mm film)15,30,60,90 frames per sec.– cardiac cath
• Spot film– 12 frames per sec– smaller film size
• cassette loaded
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FLUORO QUESTIONS
#1,13,19,30,38,39,47,54,69,75,89100, 114
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AEC
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• Collimation and AEC• Photodiode
– light sensitive– under table, behind cassette
• ion chamber– charge sensitive– above bucky and cassette– #10,16,27,34,81,92,102,113,116
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CIRCUITS
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• Self induction = autotransformer and choke coil
• Mutual induction =High voltage transformer & filament circuit
• V = VS = NS
VP= NP• I = NS = IP NP=IS
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• Rectifiers• Filament circuit• rheostat• filament circuit
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• Motor and generators• rheostat• parallel circuits• series circuits• Star and wye configurations
– transformer windings in 3-phase circuits– 20,23,26,31,37,45 ,51,52,53,74,78
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THREE PHASE/SINGLE PHASE
HU • single phase=ma x time x kvp• three phase/ 6 pulse
ma x time x kvp x 1.35• three phase/12 pulse
ma x time x kvp x 1.41
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VOLTAGE RIPPLE
• Single phase• three phase 6
pulse• three phase 12
pulse
• 100%• 13%• 4 or 3%• ?’s 35,64,88,
84,85,96,97
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Tomography
• Thinner the cut the _________the angle
• 2, 40, 43
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QUALITY CONTROL TESTS
• SPINNING TOP TIMER• WIRE MESH SCREEN/FILM CONTACT• PENETROMETER KVP AND CONTRAST• STAR PATTERN FOCAL SPOT SIZE• CUTIE PIE ROENTGEN DOSIMETER• WISCONSIN TEST TOOL KVP IN BEAM• GEIGER RADIOACTIVITY
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spinning top tests
Spinning top testsSpinning top tests• half wave/single phase = exposure time x 60• Full wave/single phase = exposure time x 120 • Three phase –exposure time =arc size/360• timers and rectifiers• dots and dashes(12 dots of 1/10sec, 24 dots of
1/5 sec, 6 dots for 1/20 sec)• synchronous spinning top• solid arc• #5,28,29,50,57,61,70,
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TUBE LIFE/HEAT LOAD
#6,7,44,,73,99,104,
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Mobile radiography
• Capacitors- temporarily stores energy-no battery
• 4,42,62,87
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DIGITAL
#3,9,16,56,67
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Misc.
• Light absorbing dye in screens reduce diffusion of fluorescent light