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An Assessment of Image Analysis of Longitudinal Bone Changes

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Abstract

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#ÃÊ·Ï#
This study was performed to assess the analyzing methods developed to detect
clinically and quantitatively longitudinal bone changes. Through preliminary experiment,
accuracy of Cu-Eq value conversion to the mass of HA was examined.
For main experiments 15 intraoral radiograms taken at soon, 1st, 2nd, 4th, and 6th
week after implantation of mixture in extracted sites of 3 cases were used. We took the
radiograms with copper step wedge as test object and HA phantom X-ray taking was
standardized by using Rinn XCP device customized directly to the individual dentition
with resin bite block. The images inputted by Quick scanner into computer were
digitized and analyzed by NIH image program The stability of the copper equivalent
transformation and the usefulness of two analyzing methods by ROI and Reslice were
examined.
Obtained results as follows:
1. On the Cu equivalent images, the coefficient of variation in the measurement of
Cu-Eq. value of ROI ranged from 0.05 to 0.24 and showed high reproducibility.
2. All results obtained by resliced contiguous image were coincident with those
obtained from the assessment by ROI and formation of plot profile.
3. On the stacked and resliced image at the line of interest, we could analyze directly
and quantitatively the longitudinal changes at several portions by plot profile and
qualitatively by surface plot.
4. Implant area showed marked resorption till 2 weeks after implantation and showed
significant increase in Cu-Eq. value at 6th week(p<0.01) and periapical area showed
increase in Cu-Eq. value at 6th week compared to after-operation's.

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