Prostyle Intra X-ray Unit 17
EXPOSURE VALUES
User's manual
9
EXPOSURE VALUES
9.1
Default exposure values
When the unit is switched on, the default exposure va-
lues appear on the displays. These preprogrammed va-
lues are used for the bite-wing exposures.
These values can be programmed by the user, see sec-
tion 10.1 “Programming the default exposure and den-
sity values” on page 19.
NOTE The exposure values are programmed corresponding
the normal mode density value 0 (factory preset va-
lue). In the digital imaging mode the exposure time
values are automatically scaled according to the den-
sity value used in digital imaging mode. The factory
preset density value in the digital imaging mode is -4.
If the density setting has been altered by the user (see
section 10.1 “Programming the default exposure and
density values” on page19), the default exposure valu-
es are changed automatically. Changing the density
value will change the selected time value as follows:
one density step equals to one time step. The negative
density value shortens the selected time value, whereas
the positive value lengthens it. The time values are
shown in section 12 “EXPOSURE VALUE TABLES”
on page23.
NOTE These values are for speed D films (Kodak Ultra-
speed) and for digital imaging. For the speed E films
(Kodak Ektaspeed) select three steps shorter exposu-
re time, and for the speed F films (Kodak Insight) fi-
ve steps shorter exposure time.
NOTE The preprogrammed default exposure values are for
the 20 cm (8”) cone. When using the 30 cm long co-
ne, use the exposure values given in the table below.
NOTE When using a film holder select 1-2 steps longer ex-
posure time.
Table 2:Default exposure values with 20 cm (8”) cone
PATIENT
kV
time
Adult
63
0.20
Child
60
0.16
Table 3:Default exposure values with 30 cm (12”) cone
PATIENT
kV
time
Adult
63
0.40
Child
60
0.32
