A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 6/00 (2006.01) G06T 7/60 (2006.01)
Patent
CA 2138648
The present invention provides a bone morphometric method using a radiograph of mainly the cancellate bone of a sample bone produced by radiography, capable of measuring the sample bone with an enhanced measuring accuracy and comprising: a step of determining a bone axis by specifying two points on the head of the sample bone and two points on the shaft of the sample bone in a region of interest in the radiograph and interconnecting the middle point on the line connecting the former two points and the middle point on the line connecting the latter two points; a step of setting reference measuring line, perpendicularly intersecting the bone axis, at a point on the bone axis at a given distance from anyone of the two points on the head of the sample bone and the middle point between the same two points; a step of producing a pattern or a plurality of patterns of the quantity of radiation transmitted through the sample bone along the reference measuring line, or a single or a plurality of measuring lines extending near the reference measuring lines; and a step of processing the pattern or the plurality of patterns by predetermined arithmetic operations to measure the sample bone; and a bone morphometric apparatus for carrying out the bone morphometric method. Only a portion of the pattern corresponding to a predetermined local region determined on the basis of the bone width of the sample bone may be processed by the arithmetic operations. Smoothed patterns obtained by smoothing the plurality of patterns of the sample bone may processed by the predetermined arithmetic operations. The sample bone may be measured by determining two boundary points on the boundary between the osteocyte and the soft tissues at the opposite ends of the sample bone in the pattern, producing a corrected pattern of the quantity of transmitted radiations transmitted through the sample bone proper by subtracting a pattern representing the quantity of transmitted radiations transmitted through the soft tissues approximated by a line interconnecting the two boundary points from the pattern, and processing the corrected pattern by arithmetic operations.
Chen Dunhao
Yoshida Makoto
Mcfadden Fincham
Teijin Limited
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