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Digital image ratio: a new radiographic method for quantifying changes in alveolar bone. Part 1: theory and methodology
Author(s) -
Jean A.,
Epelboin Y.,
Rimsky A.,
Soyer A.,
Ouhayoun J. P.
Publication year - 1996
Publication title -
journal of periodontal research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.31
H-Index - 83
eISSN - 1600-0765
pISSN - 0022-3484
DOI - 10.1111/j.1600-0765.1996.tb00479.x
Subject(s) - computer science , radiography , dental alveolus , digital image , computer vision , digital radiography , calibration , image (mathematics) , artificial intelligence , image processing , biomedical engineering , mathematics , dentistry , medicine , radiology , statistics
A new method, digital image ratio (DIR), has been developed for directly measuring changes in alveolar bone. The image on the computer monitor represents the relative mass change between two radiographs. Fourier filtering is used to reduce noise artefacts. This method is validated through an experiment with a step wedge. DIR needs only a preliminary calibration of the experimental conditions of operation and avoids tedious calibrations for each measurement as in the case of digital image substraction. Low‐voltage X‐ray techniques are suggested for long‐term quantitative studies of patients to minimize irradiation doses.