Discovery QDR Series Technical Manual
1-2
Figure 1-1. Discovery
®
-C and -W System
Figure 1-2. Discovery
®
-A and -SL System
1.1.1 X-Ray Scanning Principles
An X-ray source, consisting of a high voltage generator and X-ray tube in a common,
shielded enclosure, is mounted beneath the patient on the C-Arm. It generates a narrow,
tightly collimated, fan-shaped beam of X-rays which alternate, at power line frequency,
between 100kVp and 140kVp. At the other end of the C-Arm, above the patient, is a
crystal/solid state detector array. During a scan, the C-arm and table move, under
computer control, to guide the beam over the desired scan area.
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