Tube Head And X-Ray Insert; X-Ray Generation And Spectrum - GE Medical Systems PRODIGY Service Manual

2.7

Tube Head and X-ray Insert

2.7.1 X-ray generation and Spectrum

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PRODIGY Service Manual (Rev C - 2000)
The Tube Head consists of an oil-filled metal housing which contains a fixed-
anode X-ray Insert (essentially a vacuum tube diode), lead-type shielding,
collimating devices, a filament transformer, electrical connectors, and a
Cerium (K-edge) filter.
THe X-ray generator provides a constant 76kV potential. mA control circuit
regulates the fialment current via filament temperature to amintain the
programmed current emission. The X-ray generator only provides mA
monitor and mA limiting. PRODIGY I systems (DF+11999 and lower) have
MAX CCA, PRODIGY II systems (DF+12000 and greater have mA control
internal to the x-ray generator.
• The X-ray Insert converts current into x-rays by accelerating the
electrons across a large potential from the cathode into a tungsten target
on the anode.
• The x-rays produced by the x-ray insert are filtered by the cerium filter to
produce a dual energy spectrum. The x-ray spectrum has peaks at 62
and 38 kV.
• Insert potential is provided by a/the High Voltage Power Supply(ies).
• The tube current is set by the (c)SBC at 0.15 mA or 3.00 mA depending
on the acquisition type.
• Tube Current is set by the (c)SBC and regulated by the MAX Board
(PRODIGY I) or the Power Supply (PRODIGY II systems).
System Overview 2-65