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<Adjustment>
It is advisable to leave the photo timer adjustments in the hands of the individual representing the
manufacturer of the X-ray generators.
Basically, it is essential that the manufacturer's representatives perform these adjustments at the
same time as the film screen and/or screen system adjustments.
(1) Have ready the 5 cm, 10cm, and 20cm photo timer adjustment acrylics sheet, proceed to X-ray at
70k V, 100kV and 120kV, respectively, and adjust the photo timer in such a way that the Rex
value as in the list below. (At this step, it is mainly the sensitivity difference that is based on the
radiation quality of the photo timer which is adjusted.)
CXDI-40EG, CXDI-50G
CXDI-40EC, CXDI-50C
(2) Adjust the radiation dosage gradually using the option buttons (such as the H.S button, L.S
button, "+" (plus) and "-" (minus) button) on the X-ray generator, and decide on the final dosage.
For instance, the L.S button is for providing about 1.5 times the default dosage.
If, in overall terms, the sensitivity has shifted slightly or it differs slightly from one body part to
another, use the H.S, L.S, "+" and "-" buttons on the X-ray generator to adjust the sensitivity as
required.
Reference: If the Rex value is set as in the list when the acrylic sheet was X-rayed under the
conditions set by the above "Adjustment button", this value will be in the order of 300
to 350 when the "Chest front" button is used and the chest front of a person is X-rayed
under the following conditions.
Automated ROI#3(CHEST PA)/ with back ground
CURVE SHAPE: CHEST
BRIGHTNESS: 16
CONTRAST: 10
CXDI-40EG, CXDI-50G
CXDI-40EC, CXDI-50C
2. Installation Manual
Imaging Unit
Imaging unit
- 30 -
Rex value
650
325
W
W
a
a
Rex value
Approx. 300 - 350
Approx. 150 -175
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