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SKIN ABSORBED DOSES FROM FULL MOUTH STANDARD INTRAORAL RADIOGRAPHY IN BISECTING ANGLE AND PARALLELING TECHNIQUES

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Abstract

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This study was performed to measure the skin absorbed doses from full mouth
standard intraoral radiography(14 exposures) In bisecting angle and paralleling
techniques. Thermolu minescent dosimeters were used in a phantom. Circular tube
collimator(60§® in diameter, 20§¯ in legnth) and rectangular collimator(35§® 44§®, 40§¯
in length) were set for bisecting angle and paralleling techniques respectively. All
measurement sites were classified into 8 groups according to distance from each point
of central rays.
The results were as follows :
1. The skin absorbed doses from the paralleling technique were significantly decreased
than an those from the bisecting technique in both points at central ray and points
away from central ray.
The percentage rates of decrease were greater at points away from central ray than
those at central ray.
2. The skin absorbed doses at the lens of eye, parotid gland, submandibular gland and
thyroid region were significantly decreased in paralleling techniuqe, but those of the
midline of palate remained similar in both techniques.
3. The highest doses were measured at the site 20§® above the point of central ray
for the mandibular premolars in bisecting angle technique and at the point of central ray
for the mandibular premolars in paralleling techniques. The lowest doses were mea-
sured at the thyroid region in both techniques.

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