J Korean Acad Oral Maxillofac Radiol.  1997 Feb;27(1):73-86.

An Assessment of Image Analysis of Longitudinal Bone Changes

• Kim YJ
• Kim JD

Abstract

This study was performed to assess the analyzing methods developed to detect clinically and quantitatively longitu dinal bone changes. through preliminary experiment, accuracy of Cu-Eq value conversion to the mass of HA was examined. For main experiment, 15 intraoral radiograms taken at soon, 1st, 2nd, 4th, and 6th week after implantation of mixture in extracted sites of 3 cases were user. 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 bl ock. The images inputted by Quick scnner into computer were digitized and analyzed by NH image program, the stability of the copper equivalent trasformation 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 images were coincident with those obtained from the assessment by ROI an d formation of plot profile. 3. On the stacked and resliced image at the line of interest, we could analyze directly and quantitatively the longitud inal 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. valu e at 6th week(P<0.01) and periapical area showed increase in cu-eq. value at 6th week compared to after-operation's.

MeSH Terms

Copper
Dentition
Copper