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5-8-1 Travel and Counterbalancing
5-9Bucky Grids
5-9-1 Oscillating Grid
5-9-2 Single High Line/Rate Grid
5-9-3 Bucky Grid Alignment
Centering
Focal Range
om 5184516-100 Rev. 5
The Bucky is counterbalanced with a 14, x 17, film cassette. Loading a smaller
cassette into the tray, or removing the cassette will unbalance the Bucky when the
table is not horizontal. To prevent the Bucky from falling, position and lock the
Bucky before inserting the cassette if the table is not horizontal.
To hold the Bucky in place, apply the lock on the right side.
•
To release the lock, pull the knob out and turn it 1/4 turn.
•
To apply it, turn the knob and allow it to retract.
Approximate Bucky travel limits are:
•
With lateral shift top – 40 inches (1016 mm) of longitudinal travel.
When not in use, park and lock the Bucky at the extreme foot end of the table.
Grid choice is made at the time the equipment is ordered. Changing grids is not a
normal user operation. Call GE Service to perform this service.
The Bucky grid oscillates during the X–ray exposure. X-ray exposures are pre-
vented until the grid is in motion.
A 12:1 or 8:1 high line/rate stationary grid is available. The single high line/rate
grid does not oscillate.
Density cutoff at the edges of the film and the appearance of grid patterns indicate
inaccurate lateral alignment.
Lateral overhead tube alignment becomes critical as grid ratio increases. There-
fore, lateral stereo work using a grid is not recommended.
Longitudinal alignment is not critical and tilted tube technics may be used. It is
important that the x–ray field coincide with the film. Align the collimator projected
light coincident with the Bucky handle index mark.
The Source to Image Distance (SID) must be consistent with the grid focal range
for linear focused grids. This becomes more critical at high grid ratios.
2-23
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