GE AMX-II

GENERAL ELECTRIC MEDICAL SYSTEMS
AMX-I1 X-RAY UNIT
10-377
SM A0654E
SEC. 15 COLLIMATOR BEAM ALIGNMENT CHECKS
To meet HEW Requirements:
a. The total misalignment of the edges of the light field with the respective edges of the x-ray field along
either the length or width shall not exceed 1.8% of SID when the field is perpendicular to the x-ray
beam.
Field size indicators of length and width on collimator shall each agree with actual x-ray field size at
the receptor to within 1.8% of SID when beam axis is perpendicular to the plane of the film.
initial Conditions:
@ Main power circuit breaker - ON
© X-ray generator keyed switch - ON
e Battery charge indicator - Green band
@ Charger cord retracter
Test Consitions:
e 14% x 17” (35.5 cm x 43.2 cm)
© Vertical x-ray beam
e 40° (1.016 m) and 72” (1.83 m) SID
Load a 14” x 17” (35.5 cm x 43.2 cm) cassette
and place on floor. Position tube unit and col-
limator for a vertical x-ray beam at a SID of 40”
(1.016 m). Use collimator light to carefully
center x-ray beam perpendicularly on Cassette.
Carefully adjust collimator field indicators to a
common field side smatler than the cassette-use
12” x 12” (304.8 x 304.8 mm) for a 14” x 17”
(35.5 cm x 43.2 cm) cassette. Place a coin on
the
cassette in the anode-front corner of the light
field for reference.
4-11-37
МОТЕ:
The measuring tape built into the
collimator housing is used to meas-
ure source-to-image distance (SID).
The correct SID is indicated by
having the bottom of the collimator
housing even with the marking on
the tape which corresponds to the
desired source-to-image distance.
For accurate measurements, have
the tape tab on the end of the tape
straight down, not perpendicular
to the tape.
1
|
|
io
À
{| 407/72"
! | 1016m/1.83m
“+ 12" (304.8 mm)
COIN
22006-020
(304.8 mm)
ILLUSTRATION 4-11-46