3D
AEC Calibration
CPI Canada Inc.
Page 3D-40
Rev. D Millenia / Indico 100 Series Service Manual Ch # 740904-06
3D.10.0 AEC CALIBRATION (WALL BUCKY)
Figure 3D-15: Equipment setup for wall bucky AEC calibration
Please note the following points regarding wall bucky calibration:
•
If the wall bucky is dedicated to chest radiography, a focused grid with a 10:1 or 12:1 ratio should be
used along with an SID of 72 in (180 cm).
•
If the wall bucky will be used for conventional as well as chest radiography, then two grids should ideally
be used. See the note at the bottom of this page.
A reasonable compromise if a single grid must be used is a 10:1 ratio, 60 in (150 cm) grid.
NOTE:
SINCE MOST WALL BUCKY’S ARE USED AT 40 AND 72
″″″″
(100 AND 180 CM) SID, THE GRID
MUST BE CHOSEN WITH CARE WITH RESPECT TO CUT-OFF. A TYPICAL GRID WILL HAVE
AN 8:1 RATIO, WITH 85 LINE PAIR/INCH OR 10:1 RATIO WITH 150 LINE PAIR/INCH
(STATIONARY). TYPICALLY, 400 SPEED FILM SCREEN WILL BE USED WITH 90 SECOND
PROCESSING.