FujiFilm DR-ID 670, Руководство по эксплуатации

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Z-1
Appendix Z Precautions for Exposure
DR-ID 670 Operation Manual 897N102735
Appendix Z
Precautions for Exposure
Z.1 Precautions for the Automatic X-ray
Detection Function
Z.1.1 Precautions for Making an Exposure
1 If the READY and POWER lamps of the fl at panel sensor are not lit green, the fl at panel sensor
cannot detect X-rays automatically. Even if both of the lamps are not lit green, radiation can be
delivered to the fl at panel sensor but an image will not be output. Make sure that the lamps are lit
green before making an exposure.
2 Check the tube current of the X-ray equipment in advance, and set exposure conditions based
on the tube current by referring to the table below. If the conditions are not met, X-rays cannot be
detected automatically and an image may not be acquired.
Tube current Tube voltage Exposure
time
SID Radiation fi eld
More than
40 mA
Set the tube voltage
according to the
anatomical region
and body thickness.
More
than
5 ms
Set the SID according to
the anatomical region.
Do not limit the radiation
fi eld to the bone region
(*1) only.
More than
20 mA and less
than 40 mA
Set the tube voltage
to more than 50 kV
according to the
anatomical region
and body thickness.
Set the SID to 100 cm (39.4 in.) or less and do not
limit the radiation fi eld to the bone region (*1) only.
Alternatively, set the SID according to the anatomical
region and include the directly exposed area (*2).
More than
10 mA and less
than 20 mA
100 cm (39.4 in.) or less Include the directly
exposed area (*2).
Less than
10 mA
The automatic X-ray detection function cannot be used.
*1 When making an exposure, for example, for a fi nger or knee, set the radiation fi eld to at least 6 cm × 10 cm
(2.4 in. × 3.9 in.) for the former and at least 10 cm × 10 cm (3.9 in. × 3.9 in.) for the latter, so that the fi eld
is not limited to the bone region only.
*2 The areas of the fl at panel sensor, which are directly exposed to X-rays that do not pass through the
subject, must have a width of more than 3 cm (1.2 in.) from the subject.
3 As illustrated below, if the subject whose thinnest part is at least 40 cm (15.7 in.) in thickness covers
the entire surface of the fl at panel sensor, it cannot detect X-rays automatically and an image may
not be acquired. In this case, make an exposure so that direct exposure area is included in the
exposure region, or use the High Sensitivity Mode.
In case of using the High Sensitivity Mode, a white image might be obtained by a shock.
Figure of an exposure for the subject covering the entire surface of the flat panel sensor