HF Series Generators
Maintenance
MA-1004R4
14
2.9.1 OPTICAL DENSITY
The Film Optical Density must be measured always on the s ame
point for all the X-ray Films developed during this procedure.
The recommended point is on the central axis of the Film with
relation of the Anode and Cathode and as close as possible to
center of the Film.
USEFUL BEAM
FILM
AK
DENSITOMETER
R
1. Set SID at the Focal Distance of the Grid installed in the Table Bucky
(usually 100 cm) or in the Vertical Bucky Stand (usually 150 cm).
2. Collimate the X-ray beam so that it completely covers all three fields but
does not extend beyond limits of the phantom.
3. Place Copper plates (or equivalent homogeneous phantom) in the
Collimator Filter Holder: 1.5 mm for SID of 100 cm, 1 mm for SID 150 cm.
(1 mm Copper
≃
10 cm Plexiglass or Water).
4. Select a workstation for the Ion Chamber to be tested. Select on the
Console:
G RAD Menu: 70 kV, 200 mA Large Focus (or the first mA station for
Large Focus if 200 mA station is set for Small Focus) and 1 second
back-up time.
G AEC Menu: “Central Area”, “Density 0” and “Medium
Film/Screen”.
Note .
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