Exposure; Exposure Parameters; Procedure - Kodak 2200 User Manual

Exposure

Exposure Parameters

Procedure

1 August 2006
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.
Adjust for these differences in sensitivity by changing the exposure times
(f+, f- of the operating controls) as indicated in Table 22 on page 5-8.
Like film, different digital sensors have varying sensitivities, as indicated in
Table 23 on page 5-8, so you need to adjust exposure for sensors as well.
Use the tables, which are established under manufacturers' standard
conditions, as guidelines and adjust your exposures as needed, based on the
results you get from your system's exposure and processing.
1. Turn on the system.
The following displays light up:
• On button.
• Tooth or special exposure selector (bitewing or occlusal).
• Child or adult selector.
• Display unit showing exposure parameters: kV, mA, type of film
used, exposure time.
2. Program the generator using the control unit.
a. Select the exposure mode (RVG or film) depending on the
equipment.
The displays shows:
• 7 mA for film.
• 4 mA for RVG (use this mode to prevent overexposure of digital
sensors).
b. Select the receptor type (Table 22 on page 5-8 or Table 23 on
page 5-8)
c. Select the kV value:
• 60 kV for high-contrast radiographs.
• 70 kV for lower-contrast radiographs that provide a wider latitude
and more levels of gray (for periodontal work).
d. Select the type of patient: child or adult.
e. Adjust the receptor based on the patient's size:
• Increase the receptor type (f+) for large patients (due to risk of
underexposure).
• Reduce the receptor type (f-) for small patients (due to risk of
overexposure).
f. Select the tooth or the exposure.
The unit displays the exposure time.
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