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.

Exposure Guidelines for KODAK Films for Extraoral Radiography

Examination Image receptor
distance 		KODAK 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.