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Equipment Operation and Maintenance

Equipment Operation and Maintenance. 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 . FLUOROSCOPY. INPUT PHOSPHOR LARGE DIAMETER

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Equipment Operation and Maintenance

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  1. Equipment Operation and Maintenance

  2. 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

  3. FLUOROSCOPY • INPUT PHOSPHOR • LARGE DIAMETER • CESIUM IODIDE • X-RAYS  LIGHT • PHOTOCATHODE • LIGHT  ELECTRONS • OUTPUT PHOSPOR • SMALLER DIAMETER • ELECTRONS  LIGHT

  4. FLUORO CONT. • FOCUSSING LENSES • VIDICOM/PLUMBICON • BEAM SPLITTING DEVICE • mA • ABS • AGC or ABC

  5. 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

  6. Trifield Tubes • 25/17/12smaller diameter of input phosphor reduces: field of viewmagnification minification gain dimmer image

  7. 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

  8. FLUORO QUESTIONS #1,13,19,30,38,39,47,54,69,75,89 100, 114

  9. AEC

  10. 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

  11. CIRCUITS

  12. Self induction = autotransformer and choke coil • Mutual induction =High voltage transformer & filament circuit • V = VS = NS VP= NP • I = NS = IP NP=IS

  13. Rectifiers • Filament circuit • rheostat • filament circuit

  14. 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

  15. 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

  16. Single phase three phase 6 pulse three phase 12 pulse 100% 13% 4 or 3% ?’s 35,64,88, 84,85,96,97 VOLTAGE RIPPLE

  17. Tomography • Thinner the cut the _________the angle • 2, 40, 43

  18. 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

  19. spinning top tests Spinning 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,

  20. TUBE LIFE/HEAT LOAD #6,7,44,,73,99,104,

  21. Mobile radiography • Capacitors- temporarily stores energy-no battery • 4,42,62,87

  22. DIGITAL #3,9,16,56,67

  23. Misc. • Light absorbing dye in screens reduce diffusion of fluorescent light

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