Extraoral Exposure Guidelines
The exposure data in the following tables are starting points from which to develop individualized techniques using the 8-inch position indicating device. KODAK EKTAVISION Screens are used with KODAK EKTAVISION Imaging Film. KODAK LANEX Regular Screens are used with KODAK T-MAT Dental Films. KODAK X-OMATIC Regular Intensifying Screens are used with KODAK X-OMAT and EKTAMAT G Films. The approximate exposure times shown are for adults; for children, reduce the adult exposure time about one-third to one-half.
| Examination |
Image receptor
distance |
Film |
Exposure |
Exposure |
Exposure |
| 65 kVp |
10mA |
75 kVp |
10 mA |
90 kVp |
10mA |
| Impulse |
Second |
Impulse |
Second |
Impulse |
Second |
Ramus of mandible;
body of mandible lateral jaw |
15 inches |
EKTAVISION
T-MAT G
T-MAT L |
4 |
1/15 |
3 |
1/20 |
2 |
1/30 |
| T-MAT H* |
2 |
1/30 |
2 |
1/30 |
1 |
1/60 |
| EKTAMAT G |
18 |
3/10 |
9 |
3/20 |
6 |
1/10 |
| X-OMAT DBF |
9 |
3/20 |
5 |
1/12 |
3 |
1/20 |
| Lateral skull |
30 inches |
EKTAVISION
T-MAT G
T-MAT L |
36 |
3/5 |
18 |
3/10 |
5 |
1/12 |
| T-MAT H* |
18 |
3/10 |
9 |
3/20 |
3 |
1/20 |
| EKTAMAT G |
144 |
2 2/5 |
72 |
1 1/5 |
20 |
1/3 |
| X-OMAT DBF |
72 |
1 1/5 |
36 |
3/5 |
10 |
1/6 |
Posteroanterior skull
(Granger Technique) |
30 inches |
EKTAVISION
T-MAT G
T-MAT L |
38 |
2/3 |
19 |
1/3 |
12 |
1/5 |
| T-MAT H* |
19 |
1/3 |
10 |
1/6 |
6 |
1/10 |
| EKTAMAT G |
150 |
2 1/2 |
12 |
1/5 |
8 |
4/5 |
| X-OMAT DBF |
75 |
1 1/4 |
38 |
2/3 |
24 |
2/5 |
| Temporomandibular articulation |
10 inches |
EKTAVISION
T-MAT G
T-MAT L |
6 |
1/10 |
3 |
1/20 |
2 |
1/30 |
| T-MAT H* |
3 |
1/20 |
2 |
1/30 |
1 |
1/60 |
| EKTAMAT G |
24 |
2/5 |
12 |
1/5 |
8 |
2/15 |
| X-OMAT DBF |
12 |
1/5 |
6 |
1/10 |
4 |
1/15 |
| Lateral cephalometric |
60 inches |
EKTAVISION
T-MAT G
T-MAT L |
38 |
2/3 |
19 |
1/3 |
12 |
1/5 |
| T-MAT H* |
19 |
1/3 |
10 |
1/6 |
6 |
1/10 |
| EKTAMAT G |
150 |
2 1/2 |
75 |
1 1/4 |
48 |
4/5 |
| X-OMAT DBF |
75 |
1 1/4 |
38 |
2/3 |
24 |
2/5 |
*800-speed system when single film is loaded into a cassette with LANEX regular screens; 400 speed if double-loading techniques are used.