MTR 221 ACS - MTR 221 ACS DHHS
MANUALE ISTRUZIONI / INSTRUCTION MANUAL
C
ALIBRATION
35
Model R 221 ACS - R 221 ACS DHHS
MTR
2
21
ACS
-
MTR
2
21
AC
S DHH
S - Cali
bration
CALIBRATION
C
ENTERING
X-
RAY
B
EAM
WITH
C
OLLIMATOR
L
IGHT
• Select large focus, 60 kV and 5 mAs or equivalent for digital receptor.
• Place a loaded cassette 24 x 30 cm (9.5”x 12”) on the table top and prepare exposure.
• Set SID = 100 cm (40") by using a ruler.
• Set field to 24 x 30 cm.
• Centre the X-ray tube on the cassette.
• Switch ON the light and place four metal
strips (c) on the light field edges (a).
• Place a washer (d) on the right hand-top of
the light field.
• Make an exposure.
• Develop the film or print exposure scale 1:1.
• Measure the differences L1,L2 W1 and W2 between the outer edge of each copper strips
image and the corresponding edge of
the X-ray Field (b).
W
ARNINGS
T
HE
FOLLOWING
PROCEDURES
REQUIRE
THAT
X-
RADIATION
BE
PRODUCED
. T
AKE
ADEQUATE
PRECAUTIONS
TO
MAKE
CERTAIN
THAT
NO
PART
OF
THE
HUMAN
BODY
IS
EXPOSED
TO
X-
RADIATION
,
DIRECT
OR
INDIRECT
.
N
OTE
I
F
THE
DISTANCE
OF
100
CM
(40") SID
CANNOT
BE
DETERMINED
,
USE
THE
SID
VALUE
CLOSEST
TO
100
CM
(40")
AND
CALCULATE
THE
MEASUREMENT
TOLERANCES
AS
THE
APPROPRIATE
PERCENTAGES
OF
THE
DISTANCE
.
I
F
THE
X-
RAY
BEAM
CANNOT
BE
POSITIONED
VERTICALLY
USE
CLAMPS
,
MASKING
TAPE
,
OR
OTHER
MATERIAL
AS
REQUIRED
TO
POSITION
THE
X-
RAY
TUBE
AND
IMAGE
RECEPTOR
. T
HE
X-
RAY
TUBE
AND
THE
IMAGE
RECEPTOR
MUST
BE
SET
OUT
AT
THE
SPECIFIED
SID
DISTANCE
PERPENDICULARLY
TO
THE
X-
RAY
TUBE
AS
DESCRIBED
IN
THE
FOLLOWING
PROCEDURE
.
N
OTE
F
IGURE
C
HECK
L
IGHT
F
IELD
/X-
RAY
F
IELD
SHOWS
AN
EXAMPLE
WITH
FILM
CASSETTE
.
T
HE
SAME
PRINCIPLE
CAN
BE
USED
FOR
A
DIGITAL
SYSTEM
.
Fig: Check Light Field/X-ray Field
Light field (a)
X-Ray field (b)
