MTR 221 ACS - MTR 221 ACS DHHS
MANUALE ISTRUZIONI / INSTRUCTION MANUAL
C
OMPLIANCE
V
ERIFICATION
97
Model R 221 ACS - R 221 ACS DHHS
MT
R
2
21
ACS
-
MTR
2
21
AC
S DHH
S - Compli
ance V
erification
in millimetres of aluminium obtained during the test must be greater or equal than the values
listed in the above mentioned table.
a) Direct the central X-ray beam perpendicular and in the center of a RAD-Check instrument.
Determine the exact distance from the X-ray tube focal spot to the window of the collimator
(273 mm - 10.75"). Place the input area of the RAD-CHECK at an equal distance from the
collimator window. Collimate the beam to an area slightly larger than the detector.
b) Select a tube potential of 100 kVp and appropriate mA and seconds, with no added filtration
in the beam make an exposure and record the reading. Using a set of several sheets of 1100
Aluminium Alloy, each having a thickness of 0.5 or 1.0 mm, tape the filtration to the window
of the collimator. Make an exposure for each increments of filtration and record the reading.
c) Plot the exposure readings (log scale) versus the total added filtration thickness on semi-log
paper; see the sample hereunder.
d) Verify that HLV values in the useful beam for the above specific tube potential is not less
than the values shown in
Table - Minimum Filtration Requirement - Beam Quality (HVL)
.
V
ISUAL
D
EFINITION
OF
X-
RAY
V
ERSUS
L
IGHT
F
IELD
Chapter -
C
OLLIMATOR
C
ALIBRATION
- paragraph -
Light-Field to X-ray Field Alignment
.
F
IELD
S
IZE
I
NDICATION
Chapter-
A
DJUSTMENTS
, paragraph
Field Size Indication.
