X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1996-09-17
1997-12-09
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 56, G01N 2304, G01N 2302
Patent
active
056968051
ABSTRACT:
A method of automatically segmenting the bone regions in a digital radiograph of a body extremity comprising the steps of: providing a digital radiographic image of a body extremity having one or more digits; estimating the upper and lower threshold values of the provided image; binarizing the provided image by a binarization system which uses the estimated upper and lower threshold values to produce a bi-tonal image; removing noise from the binarized image by a noise removal system; processing the noise removed binary image by a skeletonization technique in order to form an initial estimate of the central axis of each body extremity digit; approximating the locus of points generated by the processing step by a linear fit system; joining lines with near end points with a line linking system which results in a piece wise linear approximation of the central axis for each body extremity digit; for each point along the axes, generating perpendicular projections which extend a fixed pixel distance; for each perpendicular projection, averaging the pixel values by a trace generation system; convolving each density trace with a matched filter; analyzing the output of the matched filter step by a joint detection system to locate digit joints; for each body extremity digit, determining the bone edges between two joints; and determining the average density of the digit region between the digit joints and bone edges.
REFERENCES:
patent: 4721112 (1988-01-01), Hirano et al.
patent: 5335260 (1994-08-01), Arnold
patent: 5365564 (1994-11-01), Yashida et al.
Gaborski Roger Stephen
Pawlicki Thaddeus Francis
Bruce David Vernon
Eastman Kodak Company
Noval William F.
Porta David P.
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