A comparison of the effective dose from scanography with periapical radiography.
OBJECTIVE
To compare organ and effective doses from analogue scanographic and periapical radiography.


METHODS
Thermoluminescent dosimeters (TLD-700) were inserted in the parotid glands (bilateral), submandibular glands (bilateral) and bone marrow (left ascending ramus) of three human cadavers. Dosimeters were also attached to the skin, thyroid gland and lens of both eyes. Central, left lateral and left posterior scanograms were obtained with a Cranex Tome (Soredex, Helsinki, Finland) multimodal imaging system. A similar procedure was applied for periapical radiographs of the midline, left lateral and left molar regions using E-speed film both with and without rectangular collimation. Organ and effective doses were calculated for scanograms and periapical radiographs.


RESULTS
The effective doses for the scanograms were 0.001 mSv (central), 0.011 mSv (lateral) and 0.015 mSv (posterior). The effective doses for periapical radiographs were 0.001 mSv (anterior), 0.001 mSv (lateral) and 0.003 mSv (posterior) for rectangular collimation and 0.001 mSv (anterior), 0.002 mSv (lateral) and 0.005 mSv (posterior) for round collimation.


CONCLUSIONS
When a larger area of the upper or lower jaw needs to be visualised, scanograms might be considered as an alternative to periapical radiography since the effective dose is lower.
Gijbels
F
F
Department of Periodontology, Oral Imaging Center, School of Dentistry, Oral Pathology and Maxillofacial Surgery, Catholic University Leuven, Belgium. Reinhilde.Jacobs@uz.kuleuven.ac.be
Jacobs
R
R
Sanderink
G
G
De Smet
E
E
Nowak
B
B
Van Dam
J
J
Van Steenberghe
D
D
D001853:Bone Marrow / Q000528:radiation effects; D002102:Cadaver; D006801:Humans; D007908:Lens, Crystalline / Q000528:radiation effects; D008334:Mandible / Q000528:radiation effects; D010306:Parotid Gland / Q000528:radiation effects; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D016300:Radiography, Bitewing; D012062:Relative Biological Effectiveness; D012867:Skin / Q000528:radiation effects; D013363:Submandibular Gland / Q000528:radiation effects; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation; D013961:Thyroid Gland / Q000528:radiation effects; D014057:Tomography, X-Ray Computed; D014962:X-Ray Film