Exposure; Exposure Parameters; Procedure - Kodak 2200 User Manual

Exposure

Exposure Parameters

Procedure

06/2009
Because each receptor (film, digital sensor, or phosphor plate) has its own
sensitivity to x-ray radiation, the choice of receptor affects the exposure
parameters. For instance, sensitivity class for conventional dental films is
characterized with a letter D, E, or F where F is more sensitive than E, and E
more sensitive than D. Consequently, the required dose for the correct
exposure goes down with each increase in sensitivity.
Like film, different digital sensors have varying sensitivities, so you need to
adjust exposure for sensors as well.
This KODAK 2200 system allows you to use 2 different modes with pre-set
exposure times. These modes are programmed when installing the
equipment based on your local imaging systems, as indicated in Tables 9 to
11. These tables are established under manufacturer's standard conditions
and should be used as guidelines.
At any time, you can modify these settings by following the procedure
described in the "Setting Modes" below (or in the "User Mode" section of this
guide):
•
To adjust your exposures as needed, based on the results you get
from your system's exposure and processing.
•
To actualize a change in your local imaging system.
1. Turn on the system.
The on/off button and Ready indicator light up.
2. Select the exposure mode by pressing quickly the button,
position by position, until the correct mode is displayed
(correct indicator lights up).
3. Select the kV value by pressing quickly the button:
•
60 kV for high-contrast radiographs.
•
70 kV for lower-contrast radiographs that provide a wider latitude and
more levels of grey (for periodontal work).
4. Select the type of patient by pressing quickly the button:
child, adult, large.
5. Select the tooth (or the exposure time in case of manual
mode) by turning the selection knob.
The unit displays the exposure time.
CAUTION:
The operator must instruct the patient to refrain from moving during the
entire exposure.
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