TY - JOUR
T1 - The effect of region of interest variations on morphologic operations data and gray-level values extracted from digitized dental radiographs
AU - Shrout, M. K.
AU - Farley, B. A.
AU - Patt, S. M.
AU - Potter, B. J.
AU - Hildebolt, C. F.
AU - Pilgram, T. K.
AU - Yokoyama-Crothers, N.
AU - Dotson, M.
AU - Hauser, J.
AU - Cohen, S.
AU - Kardaris, E.
AU - Hanes, Philip Jerry
PY - 1999
Y1 - 1999
N2 - Objective. To determine the correlations among morphologic operations (MO) values and the correlations among gray-level values for regions of interest (ROIs) placed at various locations on digital images of alveolar bone for 45 patients. Study design. As part of a larger study, up to 7 vertical bite-wing radiographs were taken and digitized for each of 45 patients. Sets of 2 rectangular ROIs were placed on the digitized images of interdental alveolar bone at 4 locations for each patient. The ROIs (1 crestal and 1 apical) were placed between second premolars and first molars in all 4 dental quadrants. Gray-level values were measured, and MO analysis was performed on each ROI. Descriptive statistics were calculated and correlations determined. Results. Paired correlations (such as apical vs crestal, left vs right, maxillary apical vs mandibular apical) of MO values were weak (r = 0.01-0.21), but corresponding correlations for gray-level values were relatively strong (r = 0.60-0.92). Conclusion. MO values varied with ROI location considerably more than did gray-level values. Additionally, ROI size and shape apparently affected MO data. Accurate placement and documentation of ROIs appear to be critical considerations in analyses that use MOs.
AB - Objective. To determine the correlations among morphologic operations (MO) values and the correlations among gray-level values for regions of interest (ROIs) placed at various locations on digital images of alveolar bone for 45 patients. Study design. As part of a larger study, up to 7 vertical bite-wing radiographs were taken and digitized for each of 45 patients. Sets of 2 rectangular ROIs were placed on the digitized images of interdental alveolar bone at 4 locations for each patient. The ROIs (1 crestal and 1 apical) were placed between second premolars and first molars in all 4 dental quadrants. Gray-level values were measured, and MO analysis was performed on each ROI. Descriptive statistics were calculated and correlations determined. Results. Paired correlations (such as apical vs crestal, left vs right, maxillary apical vs mandibular apical) of MO values were weak (r = 0.01-0.21), but corresponding correlations for gray-level values were relatively strong (r = 0.60-0.92). Conclusion. MO values varied with ROI location considerably more than did gray-level values. Additionally, ROI size and shape apparently affected MO data. Accurate placement and documentation of ROIs appear to be critical considerations in analyses that use MOs.
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U2 - 10.1016/S1079-2104(99)70098-3
DO - 10.1016/S1079-2104(99)70098-3
M3 - Article
C2 - 10556762
AN - SCOPUS:0033227582
SN - 1079-2104
VL - 88
SP - 636
EP - 639
JO - Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics
JF - Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics
IS - 5
ER -