Obtaining The Image Data - Kodak DirectView CR 825 Theory Manual

THEORY GUIDE
10DEC05
5 At the same time, the SCREEN moves vertically. This vertical motion is the slow scan
TG4825-1
Page direction.
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Both motions are determined by calibration data for the given SCREEN size. The MSC
BOARD A1 controls the slow scan motion through the SLOW SCAN CONTROLLER
BOARD A6. The DIGITIZER BOARD A3 controls the fast scan motion through the
GALVO BOARD A4.

Obtaining the Image Data

1 The red laser beam scans across the PHOSPHOR SCREEN in the fast scan direction.
When it hits the PHOSPHOR charged by the X-ray exposure, it causes the PHOSPHOR
to emit blue light. The brightness of the blue light is proportional to the strength of the X-
analog
signal
PMT
(1 of 2)
BLUE FILTER
red laser light
blue light
PHOSPHOR SCREEN
H194_5009GC
LIGHT COLLECTOR
Imaging Sequence