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A Quantitative Study Of Bone Density On Radiogram By Using Image Analyses

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Abstract

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#ÃÊ·Ï#
This study was performed to develop and evaluate the method to detect Quantitatively
the serial changes In the size of artificial lesion in the spongious bone by automatic
color image analyzer, 15 intraoral radiograms taken before and after endodontic
treatment of 5 cases were used (or contour line analysis. 30 intraoral radiograms taken
by geometrically standardized apparatus be(ore and after serially the formation of
artificial lesions of 0.80, 1.20, 1.75, 2.00mm in diameter at the periapical area and
interdental area of spongious bone were used. The analysis of image according to the
vanance of lesion size by 0.25, 0.35, 0.55, and 0.85mm serially was performed by the
histogram and the color enhancement with subtraction. The images inputted by
CCDcamera were digitized and analyzed by NEXUS QUBE program with NEC PC-9801
computer.
The obtained results were as follows:
1. There was no reliability in the analysis of lesions by contour line
2. The mean difference of the grey scale at each pixel was 1 step between reference
image and the corrected images.
3. In the analysis by histogram of the artificial lesion in spongeous bone, the change
over 0.55mm in the mesiodistal size was detectable by the change of the numbers of
pixel showing the change in grey scale.
4. In the analysis by histogram of the artificial lesion In spongeous bone, the change
over 0.25mm in the buccolingual size detectable by the change ia grey scale.
5. By, color enhancement with subtraction, each lesion was abbe to be isolated and
the change in it's mesiodistal size was detectable visually, but not in it's buccolingual
size.

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