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Chapt . 5 X-ray Imaging System

Chapt . 5 X-ray Imaging System. Three MAIN parts X-ray tube Operating console High voltage generator. Typical Characteristics. Usual voltage 25-125 kVp (20-35 for mammo ) Currents 100-1500 mA RAD tube usually overhead Fluoro tube usually under the RAD table

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Chapt . 5 X-ray Imaging System

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  1. Chapt. 5 X-ray Imaging System • Three MAIN parts • X-ray tube • Operating console • High voltage generator

  2. Typical Characteristics • Usual voltage 25-125 kVp (20-35 for mammo) • Currents 100-1500 mA • RAD tube usually overhead • Fluoro tube usually under the RAD table • Must be radiolucent – usually made of carbon fiber – 350-500 lb limit • Most are “floating” tabletop • Fluoro tables must have a “bucky hinge” (.25 mm pb equiv. for protection); 90/30 tilt table

  3. Console • Most are micro/mini computer • ALL are LOW VOLTAGE (kVp meter is a “pre-reading voltmeter) • Line voltage compensator • kVp major/minor • mA

  4. Timers • Mechanical (least accurate) • Synchronous • Impulse • mAs (only timer in the HI VOLTAGE circuit) • AEC

  5. Hi Voltage Transformer • Turns ratio – P is ALWAYS on your left S on your right • Only work with A/C current • Ratio of turns from primary to secondary • Steps up either volts or amps and steps down the opposite the SAME amount

  6. Rectification • ½ wave unmodified 60 cycle/sec current = 60 impulses per second • “Self rectified” is same a ½ wave and the TUBE is the diode • Full wave rectified (pulsed DC) 120 impulses per second

  7. 3 phase power • Placing 3 separate sine waves over each other in an “out of phase fashion (3 each A/C 60 cycle/sec waves) • Creates a “ripple effect” (watch the wording of any question with “ripple” as they can be tricky – of course, NOT mine) • 3 phase, 12 pulse = 100% ripple • 3 phase, 6 pulse = 14% ripple

  8. Be able to draw and label an x-ray circuit

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