MANUALE ISTRUZIONI / INSTRUCTIONS MANUAL
MTR605/025/DASM - R605/027/DASM - R605/170/DASM
Modello/Model R605DASM
L/ 1
ca
lib_
D
ASM.fm
L - S
YSTEM
C
ALIBRATION
• Produce X-rays and set the two rectangular shutter to maximum position.
• Widen the round field so that its projection is slightly smaller than the I.I. receptor
surface.
• Observe the x-ray field edges: a hazy edge means that the primary cone, near the
beam, is cutting the x-ray field instead of the iris shutters located at the collimator
exit.
• This condition may be corrected by loosening the three hexagonal centring screws
on the collimator attachment plane - see
Figure 1
in this chapter.
• Move the collimator so that the entire x-ray field edge is well defined.
• Tighten the three hexagonal screws.
• Close the two pairs of lead rectangular shuttersone at a time until the projection is
aligned with the edges projected by the round field. If alignment is noted on one
shutter only (while the other shutter juts out or is hidden by the round field), close
the rectangular field further so that the other shutter is correctly positioned. This
determines the amplitude of the correction.
• Should a correction become necessary, loosen the three hexagonal centring
screws on the iris support plate - see
Figure 2
in this chapter.
• Place the iris collimator in the desired position and tighten the three screws.
• Rotate the rectangular shutters 360°to check on uniformity of alignment over the
round field. If alignment is not uniform, repeat points 2,3, and 4.
WARNING
:
THE
FOLLOWING
PROCEDURES
REQUIRE
THAT
X
-
RADIATION
BE
PRODUCED
.
TAKE
ADEQUATE
PRECAUTIONS
TO
SEE
THAT
NO
PART
OF
THE
HUMAN
BODY
IS
EXPOSED
TO
X
-
RADIATION
,
DIRECT
OR
INDIRECT
NOTE: T
HE
HEEL
EFFECT
WILL
CAUSE
THE
FIELD
TOWARD
THE
CATHODE
TO
BE
SLIGHTLY
LESS
SHARP
THAN
ON
THE
OTHER
THREE
SIDES
. T
HIS
IS
NORMAL
AND
CANNOT
BE
CORRECTED
BY
ADJUSTMENTS
.
