1. Chapter 6 X-ray Imaging System 3- main parts
X-ray tube, operating console and high voltage generator

2. Usual voltage 25-150 (25-40 for mammo) Currents 100-1200/1500 mA
RAD tube usually overhead
Fluoro tube usually under the table
Must be radiolucent – usually made of carbon fiber and lb max.
Most are “floating”
Fluoro tables must have a “bucky hinge” (1/4 mm pb equiv for protection) and are usually 90/30 tables

3. Consoles 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 high voltage circuit)
AEC

5. Hi Voltage Transformer
Turns ratio – P is always on your left and S on your right
Only work with A/C current

6. Rectification
½ wave unmodified 60 cycle/sec current 60 impulses per second
Full wave rectified (pulsed DC) 120 impulses per second
Self rectified (same as half wave, BUT it’s the x-ray tube that does the rectification

7. 3-phase power
Placing 3 separate ac 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 questions 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 the circuit as shown on P.117!